WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Little Everdon 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Little Everdon

Northamptonshire, United Kingdom

Long range weather outlook for Little Everdon includes 14 day forecast summary:

The next 14 day outlook for Little Everdon shows the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 20°C expected on the evening of Saturday 25th. The average minimum temperature will be 9°C, dipping to its lowest on the morning of Monday 20th at 6°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. Predictions are Thursday 23rd will have the most precipitation with an accumulation of around 11.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 18
May
18:00

NE
NE

10 / 14 mph 64 / 62°F 85% 1013 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

7 / 10 mph 57 / 55°F 94% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

N
N

7 / 15 mph 47 / 43°F 92% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

8 / 16 mph 45 / 40°F 95% 1014 mb
Low level cloud: 10%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

9 / 15 mph 50 / 45°F 92% 1015 mb
Low level cloud: 11%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

12 / 14 mph 61 / 60°F 78% 1015 mb
Low level cloud: 1%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

12 / 13 mph 66 / 65°F 67% 1015 mb
Low level cloud: 3%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

12 / 14 mph 66 / 65°F 65% 1015 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 2%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

11 / 14 mph 63 / 62°F 80% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

8 / 13 mph 53 / 50°F 90% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

NE
NE

7 / 15 mph 47 / 43°F 89% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

7 / 15 mph 43 / 39°F 96% 1016 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

10 / 14 mph 46 / 41°F 97% 1016 mb
Low level cloud: 85%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

11 / 13 mph 53 / 49°F 87% 1016 mb
Low level cloud: 98%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

12 / 14 mph 61 / 60°F 77% 1014 mb
Low level cloud: 98%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

10 / 13 mph 62 / 60°F 78% 1013 mb
Low level cloud: 67%
Mid level cloud: 7%
High level cloud: 7%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

11 / 15 mph 58 / 55°F 82% 1013 mb
Low level cloud: 6%
Mid level cloud: 45%
High level cloud: 10%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

7 / 15 mph 47 / 43°F 92% 1013 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 32%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

NNE
NNE

7 / 13 mph 46 / 43°F 75% 1012 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 97%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

7 / 11 mph 46 / 43°F 75% 1011 mb
Low level cloud: 0%
Mid level cloud: 77%
High level cloud: 13%
Most Significant Cloud Type: medium
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

8 / 11 mph 48 / 44°F 83% 1011 mb
Low level cloud: 0%
Mid level cloud: 57%
High level cloud: 3%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

7 / 9 mph 55 / 52°F 79% 1010 mb
Low level cloud: 17%
Mid level cloud: 14%
High level cloud: 21%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

6 / 7 mph 62 / 61°F 74% 1009 mb
Low level cloud: 92%
Mid level cloud: 10%
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

NNE
NNE

6 / 7 mph 62 / 61°F 75% 1009 mb
Low level cloud: 92%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

4 / 4 mph 64 / 61°F 86% 1009 mb
Low level cloud: 28%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

3 / 6 mph 55 / 54°F 92% 1009 mb
Low level cloud: 12%
Mid level cloud: 55%
High level cloud: 100%
Most Significant Cloud Type: medium
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

NNW
NNW

4 / 8 mph 53 / 52°F 94% 1009 mb
Low level cloud: 7%
Mid level cloud: 60%
High level cloud: 100%
Most Significant Cloud Type: medium
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

6 / 11 mph 52 / 50°F 92% 1008 mb
Low level cloud: 4%
Mid level cloud: 64%
High level cloud: 100%
Most Significant Cloud Type: medium
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

7 / 11 mph 52 / 49°F 94% 1008 mb
Low level cloud: 10%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: medium
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

11 / 13 mph 55 / 53°F 94% 1007 mb
Low level cloud: 69%
Mid level cloud: 79%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

13 / 17 mph 55 / 51°F 93% 1007 mb
Low level cloud: 42%
Mid level cloud: 93%
High level cloud: 79%
Most Significant Cloud Type: low
83%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

WNW
WNW

10 / 13 mph 57 / 54°F 87% 1007 mb
Low level cloud: 0%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

9 / 14 mph 58 / 55°F 85% 1007 mb
Low level cloud: 0%
Mid level cloud: 55%
High level cloud: 84%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

9 / 18 mph 53 / 48°F 92% 1007 mb
Low level cloud: 0%
Mid level cloud: 52%
High level cloud: 32%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

SW
SW

8 / 17 mph 50 / 47°F 94% 1008 mb
Low level cloud: 12%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

9 / 15 mph 50 / 47°F 92% 1008 mb
Low level cloud: 6%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

8 / 12 mph 53 / 49°F 92% 1008 mb
Low level cloud: 37%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

12 / 15 mph 61 / 60°F 85% 1008 mb
Low level cloud: 41%
Mid level cloud: 39%
High level cloud: 13%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

12 / 19 mph 62 / 62°F 83% 1009 mb
Low level cloud: 83%
Mid level cloud: 30%
High level cloud: 32%
Most Significant Cloud Type: low
97%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

SW
SW

11 / 19 mph 63 / 62°F 82% 1009 mb
Low level cloud: 58%
Mid level cloud: 29%
High level cloud: 81%
Most Significant Cloud Type: low
77%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SSW
SSW

9 / 13 mph 61 / 60°F 90% 1010 mb
Low level cloud: 13%
Mid level cloud: 46%
High level cloud: 68%
Most Significant Cloud Type: medium
84%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SW
SW

7 / 12 mph 55 / 51°F 96% 1012 mb
Low level cloud: 17%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
45%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Fri 24
May
00:00

SW
SW

6 / 11 mph 49 / 47°F 97% 1014 mb
Low level cloud: 37%
Mid level cloud: 29%
High level cloud: 33%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

5 / 11 mph 47 / 44°F 96% 1014 mb
Low level cloud: 23%
Mid level cloud: 29%
High level cloud: 3%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

4 / 6 mph 53 / 50°F 93% 1015 mb
Low level cloud: 24%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

4 / 5 mph 60 / 59°F 80% 1016 mb
Low level cloud: 79%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

5 / 6 mph 67 / 64°F 68% 1016 mb
Low level cloud: 35%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

7 / 9 mph 67 / 64°F 71% 1016 mb
Low level cloud: 65%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

6 / 9 mph 65 / 63°F 87% 1017 mb
Low level cloud: 4%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

WNW
WNW

5 / 10 mph 55 / 53°F 92% 1018 mb
Low level cloud: 1%
Mid level cloud: 11%
High level cloud: 7%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 25
May
00:00

NNE
NNE

14 / 30 mph 51 / 46°F 98% 1019 mb
Low level cloud: 86%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
94%
0.0 In
06:00

WNW
WNW

5 / 10 mph 58 / 58°F 90% 1024 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: medium
5%
0.0 In
12:00

SW
SW

9 / 18 mph 59 / 57°F 59% 1021 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 99%
Most Significant Cloud Type: medium
10%
0.0 In
18:00

SSE
SSE

9 / 18 mph 64 / 64°F 86% 1020 mb
Low level cloud: 16%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
Sun 26
May
00:00

E
E

7 / 14 mph 53 / 51°F 97% 1015 mb
Low level cloud: 13%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: medium
88%
0.0 In
06:00

SE
SE

6 / 12 mph 54 / 53°F 86% 1020 mb
Low level cloud: 31%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

S
S

11 / 22 mph 63 / 63°F 71% 1006 mb
Low level cloud: 20%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: low
34%
0.0 In
18:00

ESE
ESE

9 / 19 mph 65 / 65°F 86% 1013 mb
Low level cloud: 0%
Mid level cloud: 60%
High level cloud: 100%
Most Significant Cloud Type: medium
64%
0.0 In
Mon 27
May
00:00

SSW
SSW

7 / 15 mph 51 / 48°F 98% 1016 mb
Low level cloud: 27%
Mid level cloud: 12%
High level cloud: 1%
Most Significant Cloud Type: low
100%
0.0 In
06:00

ENE
ENE

8 / 17 mph 55 / 53°F 99% 1011 mb
Low level cloud: 100%
Mid level cloud: 65%
High level cloud: 21%
Most Significant Cloud Type: low
100%
0.3 In
12:00

SW
SW

15 / 31 mph 62 / 62°F 70% 1014 mb
Low level cloud: 64%
Mid level cloud: 46%
High level cloud: 98%
Most Significant Cloud Type: low
91%
0.0 In
18:00

SSE
SSE

5 / 11 mph 64 / 64°F 87% 1010 mb
Low level cloud: 20%
Mid level cloud: 20%
High level cloud: 20%
Most Significant Cloud Type: low
29%
0.1 In
Tue 28
May
00:00

SW
SW

15 / 32 mph 55 / 51°F 94% 1011 mb
Low level cloud: 57%
Mid level cloud: 52%
High level cloud: 0%
Most Significant Cloud Type: low
74%
0.1 In
06:00

ESE
ESE

4 / 9 mph 54 / 54°F 96% 1009 mb
Low level cloud: 99%
Mid level cloud: 60%
High level cloud: 86%
Most Significant Cloud Type: low
100%
0.1 In
12:00

WSW
WSW

18 / 38 mph 60 / 60°F 74% 1011 mb
Low level cloud: 37%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: low
53%
0.0 In
18:00

SW
SW

9 / 19 mph 57 / 55°F 92% 1010 mb
Low level cloud: 55%
Mid level cloud: 44%
High level cloud: 22%
Most Significant Cloud Type: low
73%
0.1 In
Wed 29
May
00:00

WSW
WSW

9 / 19 mph 56 / 54°F 99% 1007 mb
Low level cloud: 96%
Mid level cloud: 70%
High level cloud: 7%
Most Significant Cloud Type: low
100%
0.1 In
06:00

W
W

8 / 16 mph 53 / 51°F 95% 1011 mb
Low level cloud: 97%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

14 / 30 mph 62 / 62°F 70% 1011 mb
Low level cloud: 67%
Mid level cloud: 9%
High level cloud: 20%
Most Significant Cloud Type: low
72%
0.1 In
18:00

SW
SW

10 / 21 mph 60 / 60°F 92% 1012 mb
Low level cloud: 38%
Mid level cloud: 43%
High level cloud: 12%
Most Significant Cloud Type: low
54%
0.1 In
Thu 30
May
00:00

WSW
WSW

9 / 19 mph 48 / 44°F 97% 1013 mb
Low level cloud: 33%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.1 In
06:00

SSW
SSW

9 / 19 mph 56 / 53°F 97% 1012 mb
Low level cloud: 84%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NW
NW

6 / 13 mph 64 / 64°F 70% 1016 mb
Low level cloud: 43%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
46%
0.0 In
18:00

S
S

7 / 14 mph 62 / 62°F 89% 1007 mb
Low level cloud: 16%
Mid level cloud: 92%
High level cloud: 93%
Most Significant Cloud Type: medium
100%
0.1 In
Fri 31
May
00:00

NNW
NNW

4 / 10 mph 53 / 52°F 90% 1018 mb
Low level cloud: 59%
Mid level cloud: 27%
High level cloud: 27%
Most Significant Cloud Type: low
71%
0.1 In
06:00

SSW
SSW

8 / 16 mph 56 / 54°F 97% 1004 mb
Low level cloud: 79%
Mid level cloud: 58%
High level cloud: 19%
Most Significant Cloud Type: low
100%
0.1 In
12:00

WSW
WSW

4 / 7 mph 66 / 66°F 64% 1019 mb
Low level cloud: 27%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: low
46%
0.0 In
18:00

SSW
SSW

12 / 26 mph 58 / 56°F 86% 1004 mb
Low level cloud: 10%
Mid level cloud: 8%
High level cloud: 10%
Most Significant Cloud Type: low
13%
0.2 In
Sat 01
Jun
00:00

ESE
ESE

1 / 3 mph 55 / 55°F 93% 1018 mb
Low level cloud: 54%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

S
S

7 / 15 mph 55 / 53°F 92% 1005 mb
Low level cloud: 18%
Mid level cloud: 14%
High level cloud: 2%
Most Significant Cloud Type: low
23%
0.0 In
12:00

SW
SW

12 / 25 mph 64 / 64°F 94% 1015 mb
Low level cloud: 98%
Mid level cloud: 56%
High level cloud: 73%
Most Significant Cloud Type: low
100%
0.3 In
18:00

SSW
SSW

10 / 21 mph 60 / 60°F 86% 1006 mb
Low level cloud: 10%
Mid level cloud: 20%
High level cloud: 2%
Most Significant Cloud Type: low
16%
0.1 In
Sun 02
Jun
00:00

S
S

7 / 14 mph 59 / 58°F 99% 1012 mb
Low level cloud: 72%
Mid level cloud: 13%
High level cloud: 42%
Most Significant Cloud Type: low
81%
0.0 In
06:00

SSW
SSW

9 / 19 mph 53 / 49°F 96% 1009 mb
Low level cloud: 59%
Mid level cloud: 16%
High level cloud: 33%
Most Significant Cloud Type: low
68%
0.0 In
12:00

WSW
WSW

16 / 34 mph 69 / 69°F 84% 1003 mb
Low level cloud: 71%
Mid level cloud: 14%
High level cloud: 17%
Most Significant Cloud Type: low
78%
0.1 In
18:00

WSW
WSW

12 / 26 mph 58 / 55°F 91% 1009 mb
Low level cloud: 6%
Mid level cloud: 27%
High level cloud: 33%
Most Significant Cloud Type: medium
44%
0.3 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