WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Shadwell 14 Day Long Range Forecast

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

Norfolk, United Kingdom

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

Taking a look at Shadwell over the coming two weeks and the average daytime maximum temperature will be around 19°C, with a high for the two weeks of 21°C expected on the afternoon of Monday 27th. The average minimum temperature will be 10°C, dipping to its lowest on the morning of Monday 20th at 8°C. Expect the next 14 days have most days seeing a little rain. Current predictions suggest Wednesday 22nd will have the most precipitation with an accumulation of around 15.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Sun 19
May
03:00

N
N

6 / 14 mph 48 / 45°F 97%
Low level cloud: 27%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

7 / 12 mph 54 / 50°F 91%
Low level cloud: 3%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

11 / 14 mph 64 / 63°F 69%
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 2%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

11 / 13 mph 67 / 66°F 60%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 3%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

13 / 17 mph 66 / 65°F 65%
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
18:00

NNE
NNE

11 / 15 mph 62 / 61°F 82%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

8 / 16 mph 51 / 48°F 92%
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

NNE
NNE

8 / 15 mph 50 / 47°F 87%
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

N
N

8 / 16 mph 47 / 43°F 97%
Low level cloud: 13%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

11 / 15 mph 52 / 47°F 95%
Low level cloud: 74%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

12 / 14 mph 61 / 59°F 76%
Low level cloud: 27%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

13 / 15 mph 64 / 62°F 69%
Low level cloud: 56%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

13 / 16 mph 62 / 61°F 66%
Low level cloud: 2%
Mid level cloud: 29%
High level cloud: 3%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

11 / 16 mph 56 / 52°F 76%
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

8 / 12 mph 50 / 47°F 81%
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 1%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

N
N

8 / 13 mph 49 / 46°F 84%
Low level cloud: 17%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

8 / 14 mph 48 / 44°F 94%
Low level cloud: 35%
Mid level cloud: 28%
High level cloud: 33%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

8 / 11 mph 51 / 48°F 91%
Low level cloud: 79%
Mid level cloud: 46%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

7 / 9 mph 57 / 56°F 84%
Low level cloud: 90%
Mid level cloud: 25%
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

N
N

4 / 5 mph 62 / 62°F 79%
Low level cloud: 98%
Mid level cloud: 90%
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

NNW
NNW

6 / 7 mph 63 / 63°F 81%
Low level cloud: 73%
Mid level cloud: 78%
High level cloud: 94%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

6 / 10 mph 58 / 57°F 95%
Low level cloud: 22%
Mid level cloud: 76%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNW
NNW

8 / 12 mph 56 / 54°F 98%
Low level cloud: 58%
Mid level cloud: 79%
High level cloud: 86%
Most Significant Cloud Type: low
95%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 22
May
00:00

NNW
NNW

11 / 18 mph 53 / 50°F 98%
Low level cloud: 69%
Mid level cloud: 71%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
03:00

NNW
NNW

12 / 22 mph 52 / 48°F 98%
Low level cloud: 89%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

WNW
WNW

14 / 25 mph 51 / 46°F 98%
Low level cloud: 92%
Mid level cloud: 100%
High level cloud: 57%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
09:00

WNW
WNW

15 / 23 mph 54 / 49°F 97%
Low level cloud: 100%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

W
W

16 / 20 mph 56 / 52°F 96%
Low level cloud: 99%
Mid level cloud: 91%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

14 / 17 mph 58 / 54°F 95%
Low level cloud: 73%
Mid level cloud: 60%
High level cloud: 33%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

11 / 19 mph 57 / 53°F 92%
Low level cloud: 37%
Mid level cloud: 46%
High level cloud: 7%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

9 / 17 mph 55 / 52°F 94%
Low level cloud: 20%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

SW
SW

9 / 16 mph 52 / 48°F 97%
Low level cloud: 43%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

9 / 18 mph 50 / 46°F 96%
Low level cloud: 18%
Mid level cloud: 11%
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

SW
SW

11 / 16 mph 53 / 49°F 95%
Low level cloud: 68%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

12 / 17 mph 54 / 51°F 90%
Low level cloud: 93%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

13 / 16 mph 59 / 59°F 80%
Low level cloud: 98%
Mid level cloud: 18%
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

11 / 15 mph 63 / 61°F 78%
Low level cloud: 57%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

9 / 14 mph 63 / 61°F 82%
Low level cloud: 11%
Mid level cloud: 20%
High level cloud: 14%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

7 / 14 mph 54 / 53°F 94%
Low level cloud: 14%
Mid level cloud: 4%
High level cloud: 30%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May
00:00

SW
SW

6 / 13 mph 52 / 50°F 96%
Low level cloud: 23%
Mid level cloud: 0%
High level cloud: 18%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

5 / 10 mph 50 / 48°F 97%
Low level cloud: 37%
Mid level cloud: 2%
High level cloud: 17%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

4 / 5 mph 54 / 52°F 91%
Low level cloud: 30%
Mid level cloud: 10%
High level cloud: 17%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

3 / 3 mph 61 / 60°F 78%
Low level cloud: 73%
Mid level cloud: 11%
High level cloud: 97%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

1 / 1 mph 67 / 65°F 65%
Low level cloud: 57%
Mid level cloud: 22%
High level cloud: 90%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

4 / 6 mph 64 / 63°F 75%
Low level cloud: 67%
Mid level cloud: 59%
High level cloud: 100%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

3 / 5 mph 60 / 59°F 89%
Low level cloud: 47%
Mid level cloud: 71%
High level cloud: 9%
Most Significant Cloud Type: low
73%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SSE
SSE

5 / 9 mph 57 / 54°F 95%
Low level cloud: 18%
Mid level cloud: 32%
High level cloud: 19%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
May
00:00

SW
SW

3 / 6 mph 54 / 54°F 93%
Low level cloud: 12%
Mid level cloud: 77%
High level cloud: 3%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

2 / 3 mph 53 / 53°F 93%
Low level cloud: 17%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

3 / 5 mph 56 / 55°F 91%
Low level cloud: 9%
Mid level cloud: 65%
High level cloud: 0%
Most Significant Cloud Type: medium
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

5 / 6 mph 61 / 59°F 84%
Low level cloud: 37%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

5 / 6 mph 67 / 64°F 72%
Low level cloud: 65%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

9 / 11 mph 66 / 63°F 78%
Low level cloud: 53%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

8 / 11 mph 64 / 62°F 85%
Low level cloud: 61%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

6 / 11 mph 56 / 53°F 97%
Low level cloud: 31%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Sun 26
May
00:00

E
E

8 / 17 mph 51 / 48°F 96%
Low level cloud: 16%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
35%
0.0 In
06:00

SE
SE

7 / 11 mph 57 / 56°F 89%
Low level cloud: 28%
Mid level cloud: 20%
High level cloud: 9%
Most Significant Cloud Type: low
36%
0.0 In
12:00

S
S

11 / 23 mph 62 / 62°F 81%
Low level cloud: 87%
Mid level cloud: 24%
High level cloud: 18%
Most Significant Cloud Type: low
97%
0.0 In
18:00

E
E

9 / 18 mph 65 / 65°F 86%
Low level cloud: 1%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: medium
38%
0.0 In
Mon 27
May
00:00

SW
SW

7 / 15 mph 50 / 48°F 95%
Low level cloud: 5%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
06:00

NNE
NNE

10 / 19 mph 57 / 55°F 94%
Low level cloud: 57%
Mid level cloud: 21%
High level cloud: 4%
Most Significant Cloud Type: low
64%
0.0 In
12:00

SW
SW

14 / 29 mph 63 / 64°F 66%
Low level cloud: 78%
Mid level cloud: 21%
High level cloud: 11%
Most Significant Cloud Type: low
86%
0.0 In
18:00

NE
NE

12 / 23 mph 64 / 64°F 85%
Low level cloud: 4%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In
Tue 28
May
00:00

SSW
SSW

15 / 31 mph 55 / 51°F 95%
Low level cloud: 100%
Mid level cloud: 94%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NNE
NNE

11 / 20 mph 57 / 54°F 91%
Low level cloud: 26%
Mid level cloud: 9%
High level cloud: 5%
Most Significant Cloud Type: low
29%
0.0 In
12:00

WSW
WSW

18 / 37 mph 62 / 62°F 69%
Low level cloud: 71%
Mid level cloud: 19%
High level cloud: 16%
Most Significant Cloud Type: low
79%
0.0 In
18:00

NNE
NNE

12 / 23 mph 62 / 62°F 87%
Low level cloud: 41%
Mid level cloud: 7%
High level cloud: 51%
Most Significant Cloud Type: low
49%
0.0 In
Wed 29
May
00:00

SW
SW

13 / 27 mph 56 / 53°F 97%
Low level cloud: 98%
Mid level cloud: 50%
High level cloud: 34%
Most Significant Cloud Type: low
100%
0.1 In
06:00

N
N

11 / 21 mph 57 / 55°F 94%
Low level cloud: 79%
Mid level cloud: 37%
High level cloud: 94%
Most Significant Cloud Type: low
100%
0.0 In
12:00

W
W

15 / 31 mph 64 / 64°F 64%
Low level cloud: 94%
Mid level cloud: 13%
High level cloud: 3%
Most Significant Cloud Type: low
99%
0.1 In
18:00

NNE
NNE

11 / 22 mph 65 / 65°F 85%
Low level cloud: 3%
Mid level cloud: 11%
High level cloud: 28%
Most Significant Cloud Type: medium
20%
0.0 In
Thu 30
May
00:00

WSW
WSW

10 / 22 mph 50 / 45°F 96%
Low level cloud: 17%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.1 In
06:00

NNE
NNE

14 / 27 mph 57 / 53°F 91%
Low level cloud: 36%
Mid level cloud: 15%
High level cloud: 51%
Most Significant Cloud Type: low
47%
0.0 In
12:00

NNW
NNW

7 / 15 mph 62 / 62°F 68%
Low level cloud: 68%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
71%
0.0 In
18:00

NNE
NNE

18 / 35 mph 53 / 48°F 82%
Low level cloud: 57%
Mid level cloud: 6%
High level cloud: 58%
Most Significant Cloud Type: low
66%
0.0 In
Fri 31
May
00:00

SSE
SSE

6 / 12 mph 51 / 49°F 97%
Low level cloud: 30%
Mid level cloud: 45%
High level cloud: 86%
Most Significant Cloud Type: low
56%
0.1 In
06:00

N
N

14 / 27 mph 48 / 43°F 69%
Low level cloud: 76%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WNW
WNW

6 / 13 mph 65 / 65°F 62%
Low level cloud: 17%
Mid level cloud: 45%
High level cloud: 10%
Most Significant Cloud Type: low
33%
0.0 In
18:00

N
N

14 / 27 mph 50 / 45°F 76%
Low level cloud: 93%
Mid level cloud: 1%
High level cloud: 33%
Most Significant Cloud Type: low
97%
0.0 In
Sat 01
Jun
00:00

NW
NW

2 / 4 mph 57 / 57°F 95%
Low level cloud: 23%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.1 In
06:00

NW
NW

10 / 19 mph 46 / 41°F 79%
Low level cloud: 93%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.0 In
12:00

S
S

11 / 22 mph 59 / 59°F 96%
Low level cloud: 98%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
18:00

W
W

7 / 15 mph 56 / 54°F 76%
Low level cloud: 1%
Mid level cloud: 25%
High level cloud: 77%
Most Significant Cloud Type: medium
30%
0.0 In
Sun 02
Jun
00:00

S
S

7 / 15 mph 60 / 60°F 97%
Low level cloud: 31%
Mid level cloud: 16%
High level cloud: 13%
Most Significant Cloud Type: low
38%
0.0 In
06:00

W
W

8 / 16 mph 49 / 45°F 85%
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 18%
Most Significant Cloud Type: medium
8%
0.0 In
12:00

SSW
SSW

17 / 35 mph 72 / 76°F 87%
Low level cloud: 96%
Mid level cloud: 26%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

3 / 6 mph 61 / 61°F 80%
Low level cloud: 18%
Mid level cloud: 62%
High level cloud: 5%
Most Significant Cloud Type: medium
100%
0.1 In
Mon 03
Jun
00:00

SW
SW

16 / 33 mph 54 / 50°F 88%
Low level cloud: 69%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
82%
0.0 In
06:00

WNW
WNW

7 / 16 mph 50 / 47°F 87%
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 9%
Most Significant Cloud Type: medium
16%
0.0 In
12:00

SW
SW

18 / 38 mph 64 / 64°F 66%
Low level cloud: 48%
Mid level cloud: 11%
High level cloud: 33%
Most Significant Cloud Type: low
56%
0.0 In
18:00

NNW
NNW

2 / 5 mph 63 / 63°F 80%
Low level cloud: 7%
Mid level cloud: 28%
High level cloud: 2%
Most Significant Cloud Type: medium
47%
0.0 In

Other Locations Near to Shadwell

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