Fast Forecast

WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Withybrook 14 Day Long Range Forecast

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

Warwickshire, United Kingdom

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

Reviewing the forecast for Withybrook Over the next 14 days and the average daytime maximum temperature will be around 7°C, with a high for the two weeks of 12°C expected on the afternoon of Thursday 18th. The average minimum temperature will be 4°C, dipping to its lowest on the morning of Sunday 28th at 0°C. The next 14 days will have mostly dry days although Thursday 18th and Sunday 21st are likely to see a significant amount of rain. Predictions are Thursday 18th will have the most precipitation with an accumulation of around 21.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 18
Dec		21:00

SW
SW

 20 / 33 mph 49 / 42°F 86% 1000 mb
Low level cloud: 95%
Mid level cloud: 46%
High level cloud: 78%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 19
Dec		00:00

WSW
WSW

 14 / 29 mph 43 / 35°F 80% 1004 mb
Low level cloud: 12%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 14 / 27 mph 41 / 33°F 76% 1007 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 92%
Most Significant Cloud Type: high
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 15 / 30 mph 40 / 31°F 84% 1009 mb
Low level cloud: 15%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 15 / 28 mph 43 / 35°F 80% 1012 mb
Low level cloud: 79%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 18 / 26 mph 46 / 39°F 77% 1014 mb
Low level cloud: 99%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 14 / 17 mph 48 / 43°F 80% 1015 mb
Low level cloud: 45%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 12 / 14 mph 47 / 41°F 90% 1016 mb
Low level cloud: 23%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 10 / 13 mph 44 / 39°F 94% 1016 mb
Low level cloud: 51%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 20
Dec		00:00

S
S

 8 / 13 mph 41 / 36°F 95% 1015 mb
Low level cloud: 27%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

 9 / 16 mph 40 / 34°F 94% 1013 mb
Low level cloud: 19%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 11 / 21 mph 39 / 32°F 94% 1012 mb
Low level cloud: 37%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

 12 / 20 mph 41 / 34°F 94% 1011 mb
Low level cloud: 40%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 14 / 21 mph 44 / 37°F 86% 1008 mb
Low level cloud: 52%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 14 / 19 mph 45 / 39°F 86% 1006 mb
Low level cloud: 40%
Mid level cloud: 14%
High level cloud: 53%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 15 / 19 mph 44 / 37°F 88% 1005 mb
Low level cloud: 42%
Mid level cloud: 93%
High level cloud: 98%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 14 / 21 mph 42 / 35°F 86% 1004 mb
Low level cloud: 98%
Mid level cloud: 73%
High level cloud: 67%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 21
Dec		00:00

SE
SE

 15 / 23 mph 43 / 35°F 89% 1003 mb
Low level cloud: 92%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

 13 / 22 mph 41 / 34°F 92% 1002 mb
Low level cloud: 87%
Mid level cloud: 57%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

 13 / 21 mph 41 / 33°F 95% 1002 mb
Low level cloud: 87%
Mid level cloud: 58%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 14 / 20 mph 43 / 36°F 96% 1001 mb
Low level cloud: 96%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

 17 / 27 mph 45 / 38°F 91% 999 mb
Low level cloud: 99%
Mid level cloud: 84%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

 14 / 20 mph 47 / 40°F 92% 999 mb
Low level cloud: 91%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SSE
SSE

 10 / 13 mph 46 / 41°F 92% 1001 mb
Low level cloud: 22%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 9 / 12 mph 44 / 39°F 93% 1002 mb
Low level cloud: 18%
Mid level cloud: 11%
High level cloud: 64%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 22
Dec		00:00

SE
SE

 8 / 17 mph 39 / 33°F 92% 1003 mb
Low level cloud: 12%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

 6 / 13 mph 37 / 33°F 93% 1005 mb
Low level cloud: 16%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

 6 / 12 mph 36 / 32°F 93% 1006 mb
Low level cloud: 15%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

 5 / 10 mph 39 / 35°F 91% 1007 mb
Low level cloud: 2%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 4 / 6 mph 41 / 39°F 86% 1008 mb
Low level cloud: 1%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 3 / 4 mph 43 / 42°F 88% 1009 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 55%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

 3 / 4 mph 42 / 41°F 90% 1010 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 3 / 4 mph 41 / 40°F 90% 1011 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 15%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 23
Dec		00:00

ENE
ENE

 2 / 4 mph 39 / 38°F 91% 1011 mb
Low level cloud: 3%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 4 / 7 mph 37 / 34°F 92% 1011 mb
Low level cloud: 9%
Mid level cloud: 100%
High level cloud: 22%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 4 / 7 mph 36 / 33°F 93% 1011 mb
Low level cloud: 23%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 3 / 4 mph 38 / 37°F 95% 1011 mb
Low level cloud: 30%
Mid level cloud: 100%
High level cloud: 5%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 5 / 6 mph 41 / 38°F 87% 1011 mb
Low level cloud: 24%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 5 / 6 mph 42 / 39°F 93% 1011 mb
Low level cloud: 73%
Mid level cloud: 7%
High level cloud: 70%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 6 / 8 mph 41 / 38°F 97% 1013 mb
Low level cloud: 96%
Mid level cloud: 56%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 7 / 13 mph 39 / 34°F 97% 1014 mb
Low level cloud: 98%
Mid level cloud: 63%
High level cloud: 13%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 24
Dec		00:00

NE
NE

 8 / 14 mph 39 / 34°F 94% 1015 mb
Low level cloud: 94%
Mid level cloud: 32%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 9 / 17 mph 38 / 32°F 95% 1017 mb
Low level cloud: 86%
Mid level cloud: 14%
High level cloud: 13%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 11 / 21 mph 38 / 31°F 92% 1018 mb
Low level cloud: 83%
Mid level cloud: 46%
High level cloud: 7%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 12 / 22 mph 39 / 32°F 89% 1021 mb
Low level cloud: 99%
Mid level cloud: 13%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 13 / 19 mph 41 / 34°F 87% 1024 mb
Low level cloud: 91%
Mid level cloud: 1%
High level cloud: 29%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 14 / 17 mph 42 / 35°F 81% 1025 mb
Low level cloud: 95%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 17 / 23 mph 41 / 33°F 73% 1028 mb
Low level cloud: 84%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 16 / 25 mph 40 / 31°F 72% 1030 mb
Low level cloud: 78%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 25
Dec		00:00

N
N

 9 / 13 mph 38 / 31°F 90% 1024 mb
Low level cloud: 15%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
22%
0.0 In
06:00

NE
NE

 11 / 19 mph 42 / 36°F 94% 1015 mb
Low level cloud: 84%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ESE
ESE

 13 / 20 mph 45 / 39°F 90% 1008 mb
Low level cloud: 90%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ENE
ENE

 17 / 25 mph 43 / 35°F 87% 1023 mb
Low level cloud: 98%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.0 In
Fri 26
Dec		00:00

NE
NE

 10 / 18 mph 38 / 31°F 91% 1022 mb
Low level cloud: 52%
Mid level cloud: 67%
High level cloud: 32%
Most Significant Cloud Type: low
79%
0.0 In
06:00

E
E

 12 / 21 mph 39 / 31°F 94% 1021 mb
Low level cloud: 100%
Mid level cloud: 64%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ENE
ENE

 20 / 32 mph 37 / 26°F 68% 1026 mb
Low level cloud: 63%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
62%
0.0 In
18:00

NE
NE

 18 / 26 mph 40 / 31°F 82% 1028 mb
Low level cloud: 85%
Mid level cloud: 66%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Sat 27
Dec		00:00

NE
NE

 11 / 21 mph 40 / 33°F 70% 1035 mb
Low level cloud: 98%
Mid level cloud: 6%
High level cloud: 51%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NE
NE

 16 / 34 mph 37 / 27°F 77% 1026 mb
Low level cloud: 88%
Mid level cloud: 3%
High level cloud: 25%
Most Significant Cloud Type: low
91%
0.0 In
12:00

NNE
NNE

 9 / 13 mph 42 / 37°F 92% 1032 mb
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ENE
ENE

 15 / 22 mph 40 / 31°F 75% 1023 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: low
4%
0.0 In
Sun 28
Dec		00:00

ENE
ENE

 6 / 9 mph 40 / 36°F 97% 1030 mb
Low level cloud: 59%
Mid level cloud: 0%
High level cloud: 66%
Most Significant Cloud Type: low
67%
0.0 In
06:00

E
E

 11 / 21 mph 33 / 25°F 79% 1024 mb
Low level cloud: 100%
Mid level cloud: 45%
High level cloud: 35%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ENE
ENE

 11 / 14 mph 39 / 32°F 76% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
5%
0.0 In
18:00

NE
NE

 9 / 12 mph 40 / 34°F 92% 1029 mb
Low level cloud: 58%
Mid level cloud: 7%
High level cloud: 12%
Most Significant Cloud Type: low
61%
0.0 In
Mon 29
Dec		00:00

NE
NE

 7 / 9 mph 35 / 29°F 94% 1027 mb
Low level cloud: 16%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.0 In
06:00

NE
NE

 9 / 14 mph 34 / 27°F 92% 1031 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
12:00

ENE
ENE

 7 / 10 mph 39 / 34°F 71% 1027 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
18:00

ENE
ENE

 10 / 14 mph 39 / 33°F 91% 1033 mb
Low level cloud: 47%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
47%
0.0 In
Tue 30
Dec		00:00

ENE
ENE

 5 / 6 mph 36 / 32°F 91% 1028 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

ENE
ENE

 7 / 12 mph 34 / 28°F 93% 1033 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
12:00

ENE
ENE

 7 / 9 mph 40 / 36°F 80% 1029 mb
Low level cloud: 19%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.0 In
18:00

ENE
ENE

 11 / 15 mph 38 / 31°F 90% 1033 mb
Low level cloud: 36%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: low
37%
0.0 In
Wed 31
Dec		00:00

E
E

 7 / 9 mph 38 / 33°F 85% 1030 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
06:00

ENE
ENE

 9 / 14 mph 37 / 31°F 81% 1032 mb
Low level cloud: 35%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.0 In
12:00

ESE
ESE

 8 / 11 mph 37 / 31°F 77% 1031 mb
Low level cloud: 6%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
18:00

NE
NE

 7 / 11 mph 37 / 31°F 94% 1030 mb
Low level cloud: 30%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
29%
0.0 In
Thu 01
Jan		00:00

E
E

 7 / 10 mph 34 / 28°F 95% 1029 mb
Low level cloud: 18%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.0 In
06:00

NNE
NNE

 6 / 9 mph 39 / 35°F 84% 1027 mb
Low level cloud: 93%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.0 In
12:00

ESE
ESE

 8 / 11 mph 39 / 33°F 76% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
2%
0.0 In
18:00

NE
NE

 8 / 11 mph 42 / 37°F 83% 1025 mb
Low level cloud: 88%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
88%
0.0 In
Fri 02
Jan		00:00

SE
SE

 5 / 8 mph 33 / 28°F 89% 1027 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 32%
Most Significant Cloud Type: medium
33%
0.0 In
06:00

NE
NE

 9 / 20 mph 32 / 24°F 82% 1023 mb
Low level cloud: 100%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
12:00

S
S

 9 / 12 mph 39 / 33°F 71% 1026 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 7%
Most Significant Cloud Type: medium
9%
0.0 In
18:00

E
E

 16 / 24 mph 36 / 26°F 78% 1020 mb
Low level cloud: 35%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: low
36%
0.0 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