Weather2 on Twitter Weather2 on Facebook Weather2 on YouTube Weather2 blog

WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Cale Green 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Cale Green

Cheshire, United Kingdom

Long range weather outlook for Cale Green includes 14 day forecast summary:

Reviewing the forecast for Cale Green Over the next 14 days and the average daytime maximum temperature will be around 9°C, with a high for the two weeks of 14°C expected on the afternoon of Friday 16th. The average minimum temperature will be 5°C, dipping to its lowest on the morning of Wednesday 21st at 3°C. Expect the next 14 days remain predominantly dry. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 15
Nov
18:00

S
S

10 / 12 mph 54 / 51°F 93% 1018 mb
Low level cloud: 87%
Mid level cloud: 20%
High level cloud: 6%
Most Significant Cloud Type: low
94%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

S
S

8 / 12 mph 53 / 50°F 96% 1019 mb
Low level cloud: 82%
Mid level cloud: 7%
High level cloud: 1%
Most Significant Cloud Type: low
84%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Fri 16
Nov
00:00

S
S

6 / 11 mph 51 / 49°F 98% 1021 mb
Low level cloud: 82%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

SSE
SSE

5 / 11 mph 49 / 47°F 97% 1022 mb
Low level cloud: 51%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

SE
SE

5 / 11 mph 48 / 46°F 97% 1022 mb
Low level cloud: 44%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

SE
SE

7 / 10 mph 51 / 49°F 96% 1024 mb
Low level cloud: 77%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

SE
SE

9 / 12 mph 55 / 52°F 85% 1024 mb
Low level cloud: 55%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

SE
SE

7 / 9 mph 57 / 55°F 87% 1024 mb
Low level cloud: 40%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

ESE
ESE

8 / 9 mph 55 / 53°F 92% 1025 mb
Low level cloud: 38%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

ESE
ESE

9 / 12 mph 53 / 49°F 89% 1025 mb
Low level cloud: 39%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sat 17
Nov
00:00

ESE
ESE

9 / 15 mph 48 / 44°F 88% 1026 mb
Low level cloud: 22%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

ESE
ESE

10 / 16 mph 46 / 41°F 91% 1026 mb
Low level cloud: 48%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

ESE
ESE

10 / 18 mph 45 / 39°F 88% 1026 mb
Low level cloud: 22%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

ESE
ESE

12 / 17 mph 48 / 42°F 80% 1027 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

ESE
ESE

13 / 19 mph 51 / 46°F 64% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

ESE
ESE

13 / 16 mph 53 / 48°F 67% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

ESE
ESE

14 / 16 mph 53 / 48°F 72% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

ESE
ESE

14 / 17 mph 50 / 45°F 72% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sun 18
Nov
00:00

ESE
ESE

13 / 17 mph 47 / 42°F 75% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

E
E

13 / 19 mph 46 / 40°F 75% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

E
E

12 / 21 mph 44 / 38°F 78% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

E
E

14 / 20 mph 46 / 40°F 78% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

E
E

13 / 18 mph 49 / 44°F 64% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

E
E

13 / 16 mph 51 / 46°F 66% 1030 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 1%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

E
E

14 / 16 mph 50 / 44°F 65% 1030 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

E
E

13 / 18 mph 47 / 42°F 67% 1030 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Mon 19
Nov
00:00

ENE
ENE

13 / 24 mph 43 / 36°F 81% 1029 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 2%
Most Significant Cloud Type: medium
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

ENE
ENE

13 / 27 mph 41 / 34°F 88% 1028 mb
Low level cloud: 63%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

E
E

14 / 29 mph 40 / 32°F 80% 1027 mb
Low level cloud: 71%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
73%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

E
E

14 / 21 mph 43 / 35°F 74% 1027 mb
Low level cloud: 46%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

E
E

14 / 20 mph 46 / 39°F 71% 1027 mb
Low level cloud: 72%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
82%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

ENE
ENE

13 / 15 mph 47 / 41°F 68% 1025 mb
Low level cloud: 37%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

ENE
ENE

13 / 15 mph 46 / 40°F 72% 1025 mb
Low level cloud: 71%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
71%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

ENE
ENE

12 / 14 mph 44 / 37°F 72% 1025 mb
Low level cloud: 50%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Tue 20
Nov
00:00

ENE
ENE

10 / 13 mph 42 / 36°F 74% 1024 mb
Low level cloud: 2%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

NE
NE

10 / 14 mph 40 / 34°F 78% 1023 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NE
NE

10 / 16 mph 38 / 31°F 77% 1021 mb
Low level cloud: 1%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

NE
NE

11 / 15 mph 40 / 33°F 74% 1020 mb
Low level cloud: 2%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

NE
NE

14 / 19 mph 43 / 36°F 63% 1019 mb
Low level cloud: 24%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

NE
NE

13 / 15 mph 45 / 38°F 64% 1017 mb
Low level cloud: 18%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

NE
NE

12 / 14 mph 44 / 37°F 73% 1017 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
21:00

ENE
ENE

12 / 15 mph 42 / 35°F 76% 1017 mb
Low level cloud: 1%
Mid level cloud: 20%
High level cloud: 5%
Most Significant Cloud Type: medium
22%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Wed 21
Nov
00:00

NE
NE

10 / 15 mph 40 / 34°F 78% 1017 mb
Low level cloud: 3%
Mid level cloud: 20%
High level cloud: 14%
Most Significant Cloud Type: medium
27%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

NE
NE

10 / 17 mph 39 / 32°F 81% 1016 mb
Low level cloud: 14%
Mid level cloud: 33%
High level cloud: 66%
Most Significant Cloud Type: low
33%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NNE
NNE

10 / 17 mph 37 / 31°F 83% 1015 mb
Low level cloud: 50%
Mid level cloud: 83%
High level cloud: 97%
Most Significant Cloud Type: low
90%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

NNE
NNE

10 / 14 mph 40 / 34°F 82% 1014 mb
Low level cloud: 55%
Mid level cloud: 83%
High level cloud: 97%
Most Significant Cloud Type: low
95%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

NE
NE

13 / 17 mph 44 / 37°F 70% 1014 mb
Low level cloud: 61%
Mid level cloud: 83%
High level cloud: 92%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

ENE
ENE

9 / 11 mph 45 / 40°F 73% 1013 mb
Low level cloud: 6%
Mid level cloud: 83%
High level cloud: 33%
Most Significant Cloud Type: medium
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

ENE
ENE

8 / 10 mph 44 / 39°F 81% 1015 mb
Low level cloud: 16%
Mid level cloud: 43%
High level cloud: 33%
Most Significant Cloud Type: low
34%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

NE
NE

6 / 7 mph 42 / 38°F 86% 1016 mb
Low level cloud: 12%
Mid level cloud: 32%
High level cloud: 87%
Most Significant Cloud Type: low
33%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 22
Nov
00:00

N
N

7 / 8 mph 42 / 38°F 89% 1017 mb
Low level cloud: 56%
Mid level cloud: 78%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.01 In
06:00

N
N

8 / 14 mph 42 / 37°F 87% 1024 mb
Low level cloud: 91%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
91%
0.01 In
12:00

WSW
WSW

3 / 4 mph 44 / 42°F 71% 1014 mb
Low level cloud: 0%
Mid level cloud: 76%
High level cloud: 100%
Most Significant Cloud Type: medium
80%
0.00 In
18:00

NE
NE

8 / 10 mph 47 / 43°F 79% 1032 mb
Low level cloud: 23%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
22%
0.00 In
Fri 23
Nov
00:00

NNE
NNE

6 / 7 mph 42 / 38°F 82% 1032 mb
Low level cloud: 13%
Mid level cloud: 22%
High level cloud: 1%
Most Significant Cloud Type: low
21%
0.00 In
06:00

N
N

10 / 20 mph 37 / 30°F 87% 1009 mb
Low level cloud: 82%
Mid level cloud: 64%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.00 In
12:00

NNW
NNW

7 / 9 mph 44 / 40°F 72% 1029 mb
Low level cloud: 23%
Mid level cloud: 6%
High level cloud: 6%
Most Significant Cloud Type: low
25%
0.00 In
18:00

NE
NE

12 / 14 mph 44 / 38°F 78% 1019 mb
Low level cloud: 31%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.01 In
Sat 24
Nov
00:00

NNW
NNW

9 / 12 mph 39 / 33°F 87% 1027 mb
Low level cloud: 48%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
48%
0.00 In
06:00

NNE
NNE

6 / 8 mph 40 / 35°F 87% 1019 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
0.00 In
12:00

NE
NE

12 / 15 mph 41 / 34°F 66% 1027 mb
Low level cloud: 61%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.02 In
18:00

WNW
WNW

2 / 2 mph 43 / 43°F 89% 1007 mb
Low level cloud: 16%
Mid level cloud: 60%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.02 In
Sun 25
Nov
00:00

NNE
NNE

17 / 30 mph 35 / 25°F 76% 1031 mb
Low level cloud: 8%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.01 In
06:00

NE
NE

8 / 13 mph 34 / 27°F 89% 1004 mb
Low level cloud: 13%
Mid level cloud: 89%
High level cloud: 21%
Most Significant Cloud Type: medium
100%
0.08 In
12:00

NE
NE

14 / 18 mph 41 / 33°F 68% 1036 mb
Low level cloud: 6%
Mid level cloud: 19%
High level cloud: 7%
Most Significant Cloud Type: medium
36%
0.00 In
18:00

ENE
ENE

12 / 17 mph 37 / 29°F 84% 1010 mb
Low level cloud: 23%
Mid level cloud: 62%
High level cloud: 64%
Most Significant Cloud Type: low
52%
0.01 In
Mon 26
Nov
00:00

WNW
WNW

5 / 8 mph 36 / 31°F 77% 1032 mb
Low level cloud: 37%
Mid level cloud: 58%
High level cloud: 0%
Most Significant Cloud Type: low
57%
0.01 In
06:00

NE
NE

12 / 25 mph 31 / 22°F 85% 1013 mb
Low level cloud: 31%
Mid level cloud: 77%
High level cloud: 88%
Most Significant Cloud Type: low
68%
0.02 In
12:00

N
N

15 / 20 mph 38 / 30°F 82% 1028 mb
Low level cloud: 37%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
45%
0.09 In
18:00

ENE
ENE

12 / 15 mph 35 / 27°F 79% 1016 mb
Low level cloud: 0%
Mid level cloud: 57%
High level cloud: 57%
Most Significant Cloud Type: medium
59%
0.00 In
Tue 27
Nov
00:00

NW
NW

9 / 15 mph 33 / 25°F 85% 1027 mb
Low level cloud: 0%
Mid level cloud: 50%
High level cloud: 60%
Most Significant Cloud Type: medium
52%
0.00 In
06:00

NE
NE

10 / 17 mph 31 / 22°F 83% 1019 mb
Low level cloud: 47%
Mid level cloud: 61%
High level cloud: 74%
Most Significant Cloud Type: low
77%
0.00 In
12:00

NNW
NNW

11 / 14 mph 42 / 36°F 85% 1016 mb
Low level cloud: 8%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
68%
0.12 In
18:00

NE
NE

10 / 12 mph 36 / 28°F 84% 1021 mb
Low level cloud: 41%
Mid level cloud: 43%
High level cloud: 66%
Most Significant Cloud Type: low
64%
0.04 In
Wed 28
Nov
00:00

NNW
NNW

11 / 19 mph 34 / 26°F 88% 1013 mb
Low level cloud: 27%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.01 In
06:00

NNE
NNE

11 / 19 mph 29 / 20°F 84% 1022 mb
Low level cloud: 11%
Mid level cloud: 31%
High level cloud: 4%
Most Significant Cloud Type: low
22%
0.02 In
12:00

NNW
NNW

18 / 22 mph 37 / 27°F 76% 1017 mb
Low level cloud: 52%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
56%
0.01 In
18:00

NNE
NNE

9 / 11 mph 35 / 27°F 86% 1021 mb
Low level cloud: 20%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
36%
0.01 In
Thu 29
Nov
00:00

NW
NW

10 / 15 mph 32 / 23°F 75% 1021 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 2%
Most Significant Cloud Type: medium
13%
0.00 In
06:00

N
N

10 / 19 mph 27 / 17°F 87% 1018 mb
Low level cloud: 2%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
36%
0.00 In
12:00

W
W

13 / 17 mph 39 / 32°F 79% 1017 mb
Low level cloud: 72%
Mid level cloud: 56%
High level cloud: 65%
Most Significant Cloud Type: low
99%
0.01 In
18:00

NNW
NNW

6 / 8 mph 34 / 29°F 88% 1015 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 72%
Most Significant Cloud Type: medium
46%
0.00 In
Fri 30
Nov
00:00

NNW
NNW

11 / 17 mph 32 / 23°F 80% 1014 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 3%
Most Significant Cloud Type: medium
6%
0.05 In
06:00

WSW
WSW

8 / 16 mph 29 / 21°F 93% 1009 mb
Low level cloud: 17%
Mid level cloud: 36%
High level cloud: 53%
Most Significant Cloud Type: low
35%
0.00 In
12:00

NNW
NNW

15 / 17 mph 36 / 27°F 59% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
18:00

WNW
WNW

7 / 9 mph 36 / 30°F 92% 1004 mb
Low level cloud: 7%
Mid level cloud: 55%
High level cloud: 0%
Most Significant Cloud Type: medium
73%
0.08 In

The day label given represents the local day relative to the local time for the location you are looking at.
(More Info)

Day

This time is corrected for local time zones and where possible for daylight saving times.
(More Info)

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.
(More Info)

Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
(More Info)

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.
(More Info)

Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
(More Info)

Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
(More Info)

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.
(More Info)

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.
(More Info)

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.
(More Info)

Pressure