Fast Forecast

WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Chatellerault 14 Day Long Range Forecast

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

France

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

Reviewing the forecast for Chatellerault Over the next 14 days and the average daytime maximum temperature will be around 8°C, with a high for the two weeks of 15°C expected on the afternoon of Thursday 18th. The average minimum temperature will be 3°C, dipping to its lowest on the morning of Sunday 28th at -4°C. The fortnight ahead will have mostly dry days although Friday 19th and Saturday 20th are likely to see a significant amount of rain. Current predictions suggest Friday 19th will have the most precipitation with an accumulation of around 7.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 18
Dec		22:00

SSW
SSW

 21 / 27 mph 56 / 52°F 76% 1015 mb
Low level cloud: 43%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 19
Dec		01:00

SSW
SSW

 19 / 39 mph 50 / 44°F 78% 1015 mb
Low level cloud: 60%
Mid level cloud: 80%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 19 / 38 mph 49 / 43°F 84% 1016 mb
Low level cloud: 91%
Mid level cloud: 92%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

 8 / 14 mph 49 / 46°F 95% 1018 mb
Low level cloud: 80%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

WSW
WSW

 4 / 5 mph 52 / 51°F 92% 1020 mb
Low level cloud: 70%
Mid level cloud: 79%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 4 / 5 mph 55 / 54°F 83% 1021 mb
Low level cloud: 47%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

N
N

 6 / 7 mph 55 / 54°F 81% 1021 mb
Low level cloud: 46%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

 4 / 5 mph 54 / 53°F 87% 1021 mb
Low level cloud: 93%
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
22:00

N
N

 6 / 7 mph 52 / 49°F 92% 1020 mb
Low level cloud: 100%
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
Sat 20
Dec		01:00

N
N

 9 / 13 mph 47 / 43°F 94% 1018 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

N
N

 9 / 12 mph 46 / 42°F 93% 1017 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

NNW
NNW

 4 / 5 mph 46 / 44°F 90% 1015 mb
Low level cloud: 87%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 4 / 4 mph 49 / 48°F 90% 1015 mb
Low level cloud: 42%
Mid level cloud: 60%
High level cloud: 3%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 6 / 7 mph 52 / 49°F 82% 1012 mb
Low level cloud: 76%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 7 / 9 mph 52 / 49°F 82% 1010 mb
Low level cloud: 79%
Mid level cloud: 60%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 11 / 18 mph 50 / 46°F 89% 1009 mb
Low level cloud: 35%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 11 / 19 mph 48 / 43°F 91% 1007 mb
Low level cloud: 18%
Mid level cloud: 15%
High level cloud: 14%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 21
Dec		01:00

SSE
SSE

 11 / 18 mph 47 / 42°F 92% 1005 mb
Low level cloud: 22%
Mid level cloud: 60%
High level cloud: 100%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 14 / 22 mph 48 / 42°F 86% 1004 mb
Low level cloud: 75%
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
07:00

WSW
WSW

 16 / 23 mph 47 / 41°F 86% 1002 mb
Low level cloud: 75%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 12 / 16 mph 45 / 39°F 86% 1004 mb
Low level cloud: 66%
Mid level cloud: 100%
High level cloud: 50%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 13 / 17 mph 48 / 42°F 75% 1004 mb
Low level cloud: 5%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 11 / 15 mph 46 / 41°F 76% 1004 mb
Low level cloud: 1%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: medium
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 8 / 13 mph 42 / 37°F 90% 1005 mb
Low level cloud: 13%
Mid level cloud: 89%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 7 / 11 mph 41 / 37°F 91% 1005 mb
Low level cloud: 13%
Mid level cloud: 57%
High level cloud: 76%
Most Significant Cloud Type: medium
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 22
Dec		01:00

SSE
SSE

 5 / 10 mph 40 / 36°F 92% 1005 mb
Low level cloud: 6%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 3 / 6 mph 39 / 37°F 91% 1005 mb
Low level cloud: 3%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

E
E

 4 / 7 mph 38 / 36°F 90% 1006 mb
Low level cloud: 2%
Mid level cloud: 100%
High level cloud: 90%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

E
E

 3 / 5 mph 40 / 38°F 86% 1007 mb
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 6%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ENE
ENE

 4 / 5 mph 47 / 45°F 70% 1007 mb
Low level cloud: 5%
Mid level cloud: 3%
High level cloud: 21%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

 3 / 4 mph 47 / 46°F 76% 1008 mb
Low level cloud: 36%
Mid level cloud: 9%
High level cloud: 12%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ENE
ENE

 3 / 6 mph 41 / 40°F 86% 1009 mb
Low level cloud: 33%
Mid level cloud: 8%
High level cloud: 97%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 4 / 8 mph 41 / 38°F 89% 1010 mb
Low level cloud: 50%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 23
Dec		01:00

SE
SE

 5 / 11 mph 39 / 35°F 90% 1010 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

 6 / 13 mph 37 / 32°F 92% 1009 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 7 / 13 mph 36 / 31°F 91% 1008 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 32%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 8 / 14 mph 38 / 32°F 86% 1007 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

 11 / 13 mph 46 / 41°F 69% 1006 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 62%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

 9 / 14 mph 46 / 41°F 75% 1005 mb
Low level cloud: 0%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: medium
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

 8 / 14 mph 43 / 38°F 88% 1005 mb
Low level cloud: 3%
Mid level cloud: 100%
High level cloud: 95%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

 7 / 13 mph 41 / 37°F 88% 1006 mb
Low level cloud: 2%
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
Wed 24
Dec		01:00

ENE
ENE

 8 / 13 mph 42 / 37°F 88% 1006 mb
Low level cloud: 6%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: medium
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

 9 / 14 mph 42 / 37°F 92% 1007 mb
Low level cloud: 29%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 9 / 15 mph 41 / 35°F 94% 1008 mb
Low level cloud: 52%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 11 / 16 mph 40 / 34°F 90% 1010 mb
Low level cloud: 36%
Mid level cloud: 2%
High level cloud: 10%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 14 / 16 mph 46 / 40°F 72% 1011 mb
Low level cloud: 15%
Mid level cloud: 6%
High level cloud: 18%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNE
NNE

 13 / 17 mph 46 / 40°F 74% 1012 mb
Low level cloud: 56%
Mid level cloud: 19%
High level cloud: 11%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 14 / 20 mph 42 / 35°F 80% 1014 mb
Low level cloud: 94%
Mid level cloud: 24%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

 13 / 19 mph 44 / 37°F 75% 1016 mb
Low level cloud: 88%
Mid level cloud: 7%
High level cloud: 7%
Most Significant Cloud Type: low
90%
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		01:00

NE
NE

 10 / 15 mph 41 / 35°F 88% 1013 mb
Low level cloud: 52%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: low
67%
0.0 In
07:00

NNE
NNE

 7 / 12 mph 41 / 37°F 84% 1011 mb
Low level cloud: 82%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SSW
SSW

 4 / 5 mph 50 / 49°F 73% 1010 mb
Low level cloud: 5%
Mid level cloud: 5%
High level cloud: 15%
Most Significant Cloud Type: low
8%
0.0 In
19:00

NE
NE

 5 / 7 mph 52 / 50°F 97% 1015 mb
Low level cloud: 91%
Mid level cloud: 94%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.0 In
Fri 26
Dec		01:00

NE
NE

 9 / 17 mph 38 / 32°F 95% 1010 mb
Low level cloud: 32%
Mid level cloud: 46%
High level cloud: 17%
Most Significant Cloud Type: low
49%
0.0 In
07:00

ENE
ENE

 6 / 10 mph 42 / 38°F 91% 1015 mb
Low level cloud: 1%
Mid level cloud: 58%
High level cloud: 91%
Most Significant Cloud Type: medium
64%
0.0 In
13:00

NE
NE

 12 / 15 mph 34 / 25°F 67% 1012 mb
Low level cloud: 82%
Mid level cloud: 21%
High level cloud: 7%
Most Significant Cloud Type: low
89%
0.0 In
19:00

NE
NE

 9 / 13 mph 37 / 31°F 80% 1015 mb
Low level cloud: 100%
Mid level cloud: 3%
High level cloud: 10%
Most Significant Cloud Type: low
100%
0.0 In
Sat 27
Dec		01:00

NE
NE

 11 / 18 mph 28 / 18°F 55% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

NE
NE

 7 / 10 mph 36 / 30°F 91% 1014 mb
Low level cloud: 90%
Mid level cloud: 11%
High level cloud: 6%
Most Significant Cloud Type: low
94%
0.0 In
13:00

NE
NE

 10 / 15 mph 35 / 27°F 39% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

ENE
ENE

 6 / 9 mph 38 / 34°F 82% 1015 mb
Low level cloud: 85%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
86%
0.0 In
Sun 28
Dec		01:00

NE
NE

 5 / 9 mph 28 / 22°F 69% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

ENE
ENE

 5 / 10 mph 34 / 29°F 90% 1018 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
13:00

S
S

 3 / 4 mph 40 / 39°F 54% 1022 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 12%
Most Significant Cloud Type: medium
6%
0.0 In
19:00

NE
NE

 7 / 16 mph 36 / 30°F 86% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 12%
Most Significant Cloud Type: medium
5%
0.0 In
Mon 29
Dec		01:00

S
S

 2 / 5 mph 31 / 29°F 84% 1024 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 78%
Most Significant Cloud Type: medium
48%
0.0 In
07:00

ENE
ENE

 6 / 13 mph 32 / 26°F 95% 1022 mb
Low level cloud: 25%
Mid level cloud: 6%
High level cloud: 15%
Most Significant Cloud Type: low
29%
0.0 In
13:00

ESE
ESE

 2 / 3 mph 41 / 41°F 65% 1026 mb
Low level cloud: 73%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
87%
0.0 In
19:00

ENE
ENE

 8 / 16 mph 36 / 30°F 89% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Tue 30
Dec		01:00

E
E

 4 / 7 mph 39 / 37°F 89% 1026 mb
Low level cloud: 83%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
86%
0.0 In
07:00

NE
NE

 8 / 16 mph 30 / 23°F 94% 1023 mb
Low level cloud: 16%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.0 In
13:00

E
E

 5 / 8 mph 48 / 45°F 74% 1025 mb
Low level cloud: 22%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
19:00

NE
NE

 8 / 16 mph 34 / 27°F 90% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Wed 31
Dec		01:00

E
E

 7 / 16 mph 35 / 28°F 92% 1026 mb
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
07:00

ENE
ENE

 6 / 12 mph 32 / 27°F 91% 1024 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
5%
0.0 In
13:00

E
E

 8 / 12 mph 45 / 40°F 67% 1026 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
19:00

ENE
ENE

 7 / 15 mph 39 / 34°F 85% 1023 mb
Low level cloud: 82%
Mid level cloud: 25%
High level cloud: 35%
Most Significant Cloud Type: low
95%
0.0 In
Thu 01
Jan		01:00

E
E

 7 / 14 mph 32 / 26°F 89% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
6%
0.0 In
07:00

E
E

 5 / 11 mph 36 / 31°F 86% 1021 mb
Low level cloud: 5%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
13:00

SSE
SSE

 3 / 5 mph 45 / 43°F 62% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 97%
Most Significant Cloud Type: high
97%
0.0 In
19:00

ENE
ENE

 8 / 15 mph 37 / 31°F 88% 1019 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 22%
Most Significant Cloud Type: medium
100%
0.0 In
Fri 02
Jan		01:00

SSE
SSE

 6 / 12 mph 36 / 31°F 87% 1026 mb
Low level cloud: 0%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

ENE
ENE

 11 / 21 mph 30 / 21°F 92% 1015 mb
Low level cloud: 12%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: low
13%
0.0 In
13:00

SSE
SSE

 7 / 10 mph 48 / 45°F 71% 1029 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 35%
Most Significant Cloud Type: medium
5%
0.0 In
19:00

E
E

 15 / 22 mph 38 / 30°F 66% 1007 mb
Low level cloud: 66%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In

Other Locations Near to Chatellerault

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