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

Zadar 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Zadar

Croatia

Long range weather outlook for Zadar includes 14 day forecast summary:

Over the next 14 days the Zadar forecast suggests the average daytime maximum temperature will be around 24°C, with a high for the two weeks of 29°C expected on the afternoon of Friday 28th. The average minimum temperature will be 16°C, dipping to its lowest on the morning of Wednesday 26th at 12°C. The coming 14 days will have mixed weather with some days dry and some seeing a little rain. The current forecast indicates Monday 24th will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be moderate. The strongest wind will be felt on the morning of Monday 24th, coming from a north easterly direction, and reaching around 42mph.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 24
Sep
22:00

NE
NE

28 / 33 mph 62 / 62°F 52% 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
Tue 25
Sep
01:00

NE
NE

26 / 33 mph 60 / 60°F 53% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
9%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
04:00

NE
NE

25 / 33 mph 59 / 54°F 53% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: high
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
07:00

NE
NE

24 / 29 mph 59 / 55°F 53% 1031 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
10:00

NE
NE

23 / 26 mph 63 / 62°F 46% 1032 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
13:00

NE
NE

21 / 23 mph 65 / 65°F 41% 1032 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
16:00

NE
NE

17 / 19 mph 66 / 65°F 37% 1031 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
19:00

NE
NE

17 / 19 mph 63 / 63°F 43% 1033 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
22:00

NE
NE

16 / 19 mph 61 / 61°F 45% 1035 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
Wed 26
Sep
01:00

NE
NE

16 / 21 mph 57 / 54°F 47% 1036 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
04:00

NNE
NNE

15 / 21 mph 56 / 52°F 51% 1036 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
07:00

NE
NE

15 / 20 mph 55 / 51°F 56% 1036 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
10:00

NE
NE

12 / 14 mph 63 / 63°F 41% 1037 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
13:00

NNE
NNE

8 / 9 mph 70 / 68°F 30% 1035 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
16:00

NNW
NNW

7 / 8 mph 71 / 70°F 31% 1034 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
19:00

NNE
NNE

9 / 10 mph 69 / 69°F 41% 1034 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
22:00

NE
NE

10 / 12 mph 63 / 63°F 50% 1034 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: high
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Thu 27
Sep
01:00

ENE
ENE

9 / 15 mph 58 / 57°F 51% 1034 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 12%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
04:00

ENE
ENE

8 / 14 mph 57 / 56°F 50% 1032 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 18%
Most Significant Cloud Type: medium
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
07:00

ENE
ENE

7 / 13 mph 59 / 56°F 46% 1031 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 5%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
10:00

NE
NE

2 / 2 mph 67 / 65°F 32% 1030 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
13:00

NW
NW

9 / 10 mph 80 / 78°F 33% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
16:00

NNW
NNW

9 / 11 mph 83 / 81°F 35% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: high
8%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
19:00

NE
NE

13 / 15 mph 75 / 77°F 41% 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
22:00

NE
NE

13 / 23 mph 66 / 66°F 42% 1025 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
Fri 28
Sep
01:00

NE
NE

11 / 22 mph 64 / 64°F 42% 1024 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
04:00

ENE
ENE

11 / 20 mph 62 / 62°F 42% 1022 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
07:00

ENE
ENE

10 / 18 mph 63 / 62°F 42% 1021 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
10:00

NE
NE

4 / 5 mph 77 / 75°F 30% 1021 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
13:00

WNW
WNW

6 / 7 mph 84 / 81°F 34% 1019 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
16:00

WNW
WNW

9 / 11 mph 83 / 83°F 47% 1018 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
19:00

N
N

8 / 9 mph 81 / 82°F 51% 1018 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
22:00

NE
NE

11 / 19 mph 68 / 68°F 50% 1018 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sat 29
Sep
01:00

ENE
ENE

10 / 16 mph 68 / 68°F 49% 1017 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
04:00

ENE
ENE

9 / 15 mph 67 / 67°F 49% 1017 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
07:00

ENE
ENE

9 / 15 mph 67 / 66°F 49% 1017 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
10:00

ENE
ENE

6 / 7 mph 76 / 76°F 38% 1018 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 7%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
13:00

NW
NW

3 / 3 mph 81 / 79°F 34% 1017 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
16:00

NNW
NNW

8 / 9 mph 81 / 80°F 43% 1017 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
19:00

NE
NE

16 / 20 mph 74 / 77°F 50% 1018 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
22:00

NE
NE

18 / 28 mph 69 / 69°F 56% 1020 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sun 30
Sep
01:00

NE
NE

19 / 27 mph 66 / 66°F 62% 1020 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
04:00

NE
NE

16 / 24 mph 64 / 64°F 64% 1019 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
07:00

ENE
ENE

14 / 21 mph 64 / 63°F 62% 1019 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
10:00

ENE
ENE

7 / 8 mph 74 / 76°F 46% 1019 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
13:00

WSW
WSW

4 / 4 mph 78 / 77°F 43% 1018 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
16:00

WNW
WNW

4 / 4 mph 78 / 78°F 49% 1017 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
19:00

NNE
NNE

5 / 6 mph 74 / 77°F 56% 1017 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
22:00

ENE
ENE

8 / 9 mph 72 / 76°F 61% 1017 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 01
Oct
01:00

NE
NE

12 / 17 mph 59 / 56°F 52% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
07:00

WNW
WNW

5 / 6 mph 71 / 71°F 67% 1010 mb
Low level cloud: 14%
Mid level cloud: 8%
High level cloud: 8%
Most Significant Cloud Type: low
17%
0.02 In
13:00

SSE
SSE

11 / 13 mph 77 / 79°F 61% 1016 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 4%
Most Significant Cloud Type: medium
7%
0.00 In
19:00

NE
NE

3 / 3 mph 81 / 85°F 68% 1018 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.00 In
Tue 02
Oct
01:00

NNE
NNE

24 / 28 mph 59 / 55°F 64% 1019 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.00 In
07:00

E
E

13 / 18 mph 69 / 69°F 72% 1018 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 11%
Most Significant Cloud Type: medium
19%
0.06 In
13:00

NNE
NNE

19 / 23 mph 62 / 62°F 46% 1022 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 21%
Most Significant Cloud Type: medium
45%
0.00 In
19:00

SE
SE

9 / 14 mph 73 / 77°F 71% 1020 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 18%
Most Significant Cloud Type: medium
16%
0.01 In
Wed 03
Oct
01:00

N
N

4 / 5 mph 71 / 71°F 54% 1020 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 83%
Most Significant Cloud Type: medium
10%
0.00 In
07:00

E
E

9 / 16 mph 68 / 68°F 77% 1021 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.06 In
13:00

W
W

5 / 6 mph 73 / 76°F 43% 1021 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.00 In
19:00

NE
NE

20 / 23 mph 73 / 77°F 66% 1025 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 1%
Most Significant Cloud Type: medium
7%
0.00 In
Thu 04
Oct
01:00

NE
NE

19 / 23 mph 62 / 62°F 57% 1026 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.00 In
07:00

ENE
ENE

12 / 16 mph 62 / 62°F 53% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
13:00

NW
NW

6 / 8 mph 69 / 69°F 40% 1026 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.00 In
19:00

NW
NW

5 / 6 mph 73 / 76°F 45% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
Fri 05
Oct
01:00

NE
NE

3 / 4 mph 71 / 71°F 57% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.00 In
07:00

N
N

3 / 3 mph 70 / 70°F 52% 1024 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 10%
Most Significant Cloud Type: medium
4%
0.00 In
13:00

SSW
SSW

8 / 10 mph 77 / 79°F 61% 1018 mb
Low level cloud: 26%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
29%
0.00 In
19:00

NW
NW

9 / 10 mph 73 / 77°F 69% 1022 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
Sat 06
Oct
01:00

E
E

6 / 7 mph 69 / 69°F 75% 1018 mb
Low level cloud: 18%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
22%
0.00 In
07:00

NNE
NNE

6 / 10 mph 69 / 69°F 65% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.00 In
13:00

ENE
ENE

6 / 7 mph 71 / 71°F 37% 1021 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 32%
Most Significant Cloud Type: medium
5%
0.00 In
19:00

N
N

8 / 13 mph 73 / 77°F 62% 1023 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.00 In
Sun 07
Oct
01:00

ENE
ENE

10 / 16 mph 61 / 61°F 49% 1021 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.00 In
07:00

ENE
ENE

5 / 8 mph 71 / 71°F 52% 1025 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.00 In
13:00

SSE
SSE

13 / 16 mph 71 / 71°F 65% 1014 mb
Low level cloud: 49%
Mid level cloud: 42%
High level cloud: 0%
Most Significant Cloud Type: low
63%
0.00 In
19:00

NNW
NNW

4 / 4 mph 78 / 81°F 66% 1023 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.00 In
Mon 08
Oct
01:00

SSE
SSE

22 / 33 mph 75 / 78°F 79% 1008 mb
Low level cloud: 28%
Mid level cloud: 46%
High level cloud: 7%
Most Significant Cloud Type: low
45%
0.09 In
07:00

NNE
NNE

6 / 8 mph 72 / 76°F 70% 1023 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: medium
10%
0.00 In
13:00

S
S

12 / 21 mph 79 / 83°F 69% 1003 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 3%
Most Significant Cloud Type: medium
21%
0.18 In
19:00

N
N

7 / 9 mph 77 / 80°F 70% 1022 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.00 In
Tue 09
Oct
01:00

WSW
WSW

16 / 33 mph 68 / 68°F 70% 999 mb
Low level cloud: 15%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.68 In
07:00

E
E

4 / 4 mph 74 / 77°F 63% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.00 In
13:00

SW
SW

15 / 33 mph 73 / 77°F 60% 996 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 34%
Most Significant Cloud Type: medium
44%
0.74 In
19:00

SE
SE

6 / 7 mph 79 / 82°F 72% 1018 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.00 In

Other Locations Near to Zadar

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