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Santa Maria Island 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Santa Maria Island

Azores Islands

Long range weather outlook for Santa Maria Island includes 14 day forecast summary:

The outlook for Santa Maria Island in the two weeks ahead shows the average daytime maximum temperature will be around 26°C, with a high for the two weeks of 28°C expected on the afternoon of Sunday 9th. The average minimum temperature will be 21°C, dipping to its lowest on the morning of Saturday 15th at 20°C. Expect the following 14 days ahead to have mixed weather with some days dry and some seeing a little rain. The current forecast indicates Sunday 9th will have the most precipitation with an accumulation of around 1.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 08
Aug
17:00

E
E

11 / 12 mph 79 / 81°F 82% 1022 mb
Low level cloud: 29%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
39%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

E
E

10 / 12 mph 77 / 79°F 83% 1023 mb
Low level cloud: 31%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
35%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

ESE
ESE

9 / 12 mph 74 / 78°F 83% 1023 mb
Low level cloud: 21%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
Sun 09
Aug
02:00

ESE
ESE

8 / 11 mph 73 / 77°F 82% 1023 mb
Low level cloud: 21%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
20%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

ESE
ESE

6 / 9 mph 72 / 76°F 81% 1022 mb
Low level cloud: 36%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

ESE
ESE

5 / 7 mph 76 / 77°F 82% 1023 mb
Low level cloud: 15%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
11:00

SE
SE

6 / 7 mph 80 / 81°F 82% 1024 mb
Low level cloud: 25%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
14:00

S
S

7 / 8 mph 83 / 85°F 81% 1023 mb
Low level cloud: 64%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
63%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
17:00

SW
SW

4 / 5 mph 81 / 83°F 79% 1022 mb
Low level cloud: 75%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
75%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
20:00

WNW
WNW

5 / 6 mph 80 / 80°F 77% 1023 mb
Low level cloud: 55%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
56%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
23:00

WNW
WNW

5 / 6 mph 75 / 78°F 76% 1023 mb
Low level cloud: 21%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Mon 10
Aug
02:00

WNW
WNW

4 / 6 mph 72 / 76°F 74% 1022 mb
Low level cloud: 17%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

N
N

5 / 9 mph 70 / 70°F 77% 1021 mb
Low level cloud: 13%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

NE
NE

10 / 13 mph 74 / 76°F 80% 1021 mb
Low level cloud: 63%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

NNE
NNE

6 / 7 mph 79 / 79°F 75% 1022 mb
Low level cloud: 45%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

N
N

5 / 6 mph 82 / 82°F 72% 1021 mb
Low level cloud: 44%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

N
N

6 / 7 mph 81 / 81°F 70% 1021 mb
Low level cloud: 21%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

N
N

6 / 7 mph 77 / 78°F 73% 1021 mb
Low level cloud: 72%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

NE
NE

4 / 4 mph 73 / 77°F 73% 1022 mb
Low level cloud: 45%
Mid level cloud: 23%
High level cloud: 1%
Most Significant Cloud Type: low
52%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Tue 11
Aug
02:00

WNW
WNW

3 / 4 mph 71 / 71°F 74% 1021 mb
Low level cloud: 49%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

NW
NW

7 / 12 mph 70 / 70°F 79% 1021 mb
Low level cloud: 43%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

NNW
NNW

6 / 8 mph 74 / 76°F 78% 1022 mb
Low level cloud: 4%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

ENE
ENE

5 / 6 mph 77 / 77°F 76% 1024 mb
Low level cloud: 15%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

ENE
ENE

6 / 6 mph 79 / 79°F 76% 1023 mb
Low level cloud: 43%
Mid level cloud: 7%
High level cloud: 1%
Most Significant Cloud Type: low
45%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

NE
NE

11 / 14 mph 77 / 78°F 79% 1023 mb
Low level cloud: 48%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
20:00

ENE
ENE

18 / 21 mph 74 / 77°F 83% 1024 mb
Low level cloud: 31%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
23:00

NE
NE

17 / 21 mph 72 / 76°F 79% 1025 mb
Low level cloud: 24%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Wed 12
Aug
02:00

NE
NE

15 / 21 mph 70 / 70°F 75% 1024 mb
Low level cloud: 16%
Mid level cloud: 2%
High level cloud: 1%
Most Significant Cloud Type: low
16%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

NE
NE

14 / 21 mph 69 / 69°F 70% 1024 mb
Low level cloud: 21%
Mid level cloud: 8%
High level cloud: 1%
Most Significant Cloud Type: low
23%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

NNE
NNE

13 / 20 mph 72 / 76°F 67% 1025 mb
Low level cloud: 55%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

NE
NE

13 / 15 mph 75 / 77°F 72% 1026 mb
Low level cloud: 38%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

NNE
NNE

13 / 15 mph 77 / 79°F 73% 1025 mb
Low level cloud: 47%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
17:00

NNE
NNE

13 / 16 mph 77 / 78°F 72% 1025 mb
Low level cloud: 36%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

NNE
NNE

16 / 19 mph 74 / 77°F 74% 1026 mb
Low level cloud: 20%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

NNE
NNE

15 / 20 mph 71 / 71°F 74% 1026 mb
Low level cloud: 13%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Thu 13
Aug
02:00

NE
NE

14 / 20 mph 70 / 70°F 74% 1025 mb
Low level cloud: 26%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

NE
NE

14 / 22 mph 69 / 69°F 73% 1024 mb
Low level cloud: 38%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

NE
NE

14 / 19 mph 72 / 76°F 73% 1025 mb
Low level cloud: 24%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

NE
NE

12 / 14 mph 75 / 77°F 73% 1025 mb
Low level cloud: 21%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

NE
NE

12 / 14 mph 77 / 79°F 73% 1025 mb
Low level cloud: 32%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

NE
NE

11 / 13 mph 77 / 78°F 70% 1025 mb
Low level cloud: 53%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

NE
NE

13 / 15 mph 75 / 77°F 74% 1026 mb
Low level cloud: 45%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

NE
NE

15 / 18 mph 72 / 72°F 72% 1026 mb
Low level cloud: 29%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Fri 14
Aug
02:00

NE
NE

12 / 18 mph 71 / 71°F 69% 1025 mb
Low level cloud: 61%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
61%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

NE
NE

11 / 19 mph 70 / 70°F 68% 1025 mb
Low level cloud: 90%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
90%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

NE
NE

12 / 18 mph 73 / 76°F 71% 1025 mb
Low level cloud: 28%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

NE
NE

12 / 14 mph 75 / 77°F 78% 1026 mb
Low level cloud: 30%
Mid level cloud: 5%
High level cloud: 7%
Most Significant Cloud Type: low
33%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

NNE
NNE

13 / 15 mph 77 / 79°F 76% 1025 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: medium
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

NE
NE

16 / 19 mph 77 / 79°F 82% 1025 mb
Low level cloud: 47%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

NE
NE

15 / 17 mph 75 / 77°F 78% 1026 mb
Low level cloud: 27%
Mid level cloud: 1%
High level cloud: 4%
Most Significant Cloud Type: low
27%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

NE
NE

14 / 18 mph 72 / 76°F 73% 1026 mb
Low level cloud: 30%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
29%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 15
Aug
05:00

N
N

7 / 11 mph 69 / 69°F 72% 1020 mb
Low level cloud: 73%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
73%
0.00 In
11:00

ENE
ENE

16 / 19 mph 73 / 77°F 78% 1024 mb
Low level cloud: 35%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
45%
0.02 In
17:00

NE
NE

13 / 15 mph 73 / 77°F 79% 1021 mb
Low level cloud: 45%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
45%
0.00 In
23:00

NE
NE

11 / 15 mph 72 / 76°F 76% 1025 mb
Low level cloud: 29%
Mid level cloud: 14%
High level cloud: 2%
Most Significant Cloud Type: low
34%
0.00 In
Sun 16
Aug
05:00

NE
NE

13 / 20 mph 69 / 69°F 73% 1025 mb
Low level cloud: 12%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.00 In
11:00

ENE
ENE

13 / 17 mph 72 / 76°F 79% 1026 mb
Low level cloud: 74%
Mid level cloud: 28%
High level cloud: 8%
Most Significant Cloud Type: low
84%
0.04 In
17:00

WNW
WNW

6 / 7 mph 76 / 79°F 69% 1023 mb
Low level cloud: 15%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.00 In
23:00

NE
NE

10 / 15 mph 71 / 71°F 70% 1025 mb
Low level cloud: 67%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
66%
0.00 In
Mon 17
Aug
05:00

NW
NW

9 / 15 mph 70 / 70°F 80% 1022 mb
Low level cloud: 28%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
29%
0.01 In
11:00

NNW
NNW

8 / 9 mph 74 / 78°F 70% 1025 mb
Low level cloud: 14%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.00 In
17:00

NW
NW

9 / 12 mph 74 / 78°F 77% 1024 mb
Low level cloud: 15%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.00 In
23:00

NNE
NNE

11 / 18 mph 72 / 76°F 81% 1024 mb
Low level cloud: 1%
Mid level cloud: 26%
High level cloud: 32%
Most Significant Cloud Type: medium
31%
0.04 In
Tue 18
Aug
05:00

NNW
NNW

7 / 11 mph 71 / 71°F 83% 1024 mb
Low level cloud: 6%
Mid level cloud: 4%
High level cloud: 79%
Most Significant Cloud Type: medium
23%
0.00 In
11:00

NNE
NNE

18 / 26 mph 71 / 71°F 77% 1024 mb
Low level cloud: 89%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
90%
0.01 In
17:00

N
N

6 / 8 mph 74 / 77°F 73% 1025 mb
Low level cloud: 27%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.00 In
23:00

NNE
NNE

17 / 24 mph 70 / 70°F 77% 1024 mb
Low level cloud: 33%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.00 In
Wed 19
Aug
05:00

ENE
ENE

11 / 18 mph 70 / 70°F 80% 1025 mb
Low level cloud: 67%
Mid level cloud: 17%
High level cloud: 2%
Most Significant Cloud Type: low
73%
0.05 In
11:00

NNE
NNE

15 / 18 mph 73 / 77°F 78% 1023 mb
Low level cloud: 40%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.01 In
17:00

ENE
ENE

10 / 11 mph 73 / 77°F 67% 1025 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
23:00

NNE
NNE

6 / 9 mph 71 / 71°F 72% 1023 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.00 In
Thu 20
Aug
05:00

NE
NE

7 / 11 mph 69 / 69°F 69% 1025 mb
Low level cloud: 59%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
58%
0.00 In
11:00

NE
NE

7 / 8 mph 73 / 77°F 75% 1023 mb
Low level cloud: 56%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
56%
0.00 In
17:00

N
N

2 / 2 mph 74 / 77°F 64% 1024 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
5%
0.00 In
23:00

ENE
ENE

6 / 8 mph 72 / 76°F 73% 1024 mb
Low level cloud: 33%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.01 In
Fri 21
Aug
05:00

NW
NW

2 / 4 mph 69 / 69°F 68% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
11:00

SSW
SSW

0 / 0 mph 74 / 78°F 72% 1025 mb
Low level cloud: 31%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.00 In
17:00

W
W

8 / 9 mph 76 / 78°F 69% 1022 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.00 In
23:00

WNW
WNW

6 / 8 mph 72 / 76°F 71% 1025 mb
Low level cloud: 5%
Mid level cloud: 4%
High level cloud: 57%
Most Significant Cloud Type: medium
19%
0.00 In
Sat 22
Aug
05:00

W
W

10 / 18 mph 70 / 70°F 88% 1021 mb
Low level cloud: 18%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.01 In
11:00

W
W

10 / 11 mph 76 / 80°F 85% 1025 mb
Low level cloud: 33%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.00 In
17:00

W
W

12 / 14 mph 77 / 82°F 87% 1021 mb
Low level cloud: 14%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.00 In
23:00

NW
NW

11 / 16 mph 74 / 78°F 88% 1025 mb
Low level cloud: 12%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.00 In
Sun 23
Aug
05:00

W
W

11 / 19 mph 72 / 76°F 92% 1021 mb
Low level cloud: 36%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.05 In
11:00

NNE
NNE

7 / 8 mph 76 / 79°F 85% 1026 mb
Low level cloud: 12%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.00 In
17:00

W
W

15 / 17 mph 78 / 83°F 88% 1022 mb
Low level cloud: 16%
Mid level cloud: 6%
High level cloud: 6%
Most Significant Cloud Type: low
19%
0.00 In
23:00

NE
NE

9 / 11 mph 74 / 77°F 79% 1025 mb
Low level cloud: 35%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: low
36%
0.00 In

The day label given represents the local day relative to the local time for the location you are looking at.
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Day

This time is corrected for local time zones and where possible for daylight saving times.
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Local Time

The wind direction we use on this page is the direction the wind is coming from, given in a 16 point compass format.
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Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
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Speed/
Gust

Temperature from our forecast perspective are fairly well defined, they are what we would expect to measure in a standard meteorological screen (in other words, shaded and well ventilated) at 2 metres above ground level.
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Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
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Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
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Precip Amount

The total amount of cloud as a percentage is derived from looking at cloud cover throughout the atmosphere and estimating how these combine when looked at from the ground.
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Cloud Amount

Here we try to capture the feel of the weather as an image � it will never be perfect but is useful for a quick overview.
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Weather

When we measure for forecast air pressure we are normally doing this relative to a certain height and most commonly relative to Mean Sea Level.
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Pressure