WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Upham 14 Day Long Range Forecast

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

Devon, United Kingdom

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

Over the next 14 days the Upham forecast suggests the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 19°C expected on the afternoon of Wednesday 22nd. The average minimum temperature will be 10°C, dipping to its lowest on the morning of Friday 24th at 6°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. Current predictions suggest Wednesday 22nd will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 14
May
15:00

SSE
SSE

16 / 19 mph 60 / 56°F 81% 996 mb
Low level cloud: 45%
Mid level cloud: 14%
High level cloud: 29%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

11 / 13 mph 58 / 55°F 87% 997 mb
Low level cloud: 24%
Mid level cloud: 13%
High level cloud: 9%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

9 / 12 mph 55 / 53°F 86% 999 mb
Low level cloud: 93%
Mid level cloud: 46%
High level cloud: 97%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 15
May
00:00

SSE
SSE

12 / 20 mph 52 / 47°F 95% 999 mb
Low level cloud: 63%
Mid level cloud: 26%
High level cloud: 14%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

10 / 17 mph 50 / 46°F 97% 1000 mb
Low level cloud: 73%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

13 / 20 mph 53 / 48°F 93% 1001 mb
Low level cloud: 57%
Mid level cloud: 59%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

17 / 21 mph 56 / 52°F 87% 1002 mb
Low level cloud: 18%
Mid level cloud: 57%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

15 / 18 mph 59 / 55°F 75% 1003 mb
Low level cloud: 25%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

14 / 17 mph 59 / 55°F 77% 1003 mb
Low level cloud: 35%
Mid level cloud: 70%
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

E
E

14 / 20 mph 56 / 53°F 83% 1003 mb
Low level cloud: 55%
Mid level cloud: 99%
High level cloud: 2%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

11 / 19 mph 52 / 48°F 94% 1004 mb
Low level cloud: 23%
Mid level cloud: 27%
High level cloud: 20%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
May
00:00

E
E

6 / 13 mph 50 / 47°F 96% 1005 mb
Low level cloud: 32%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

5 / 11 mph 49 / 46°F 96% 1005 mb
Low level cloud: 45%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

6 / 9 mph 53 / 49°F 96% 1005 mb
Low level cloud: 44%
Mid level cloud: 10%
High level cloud: 47%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

11 / 13 mph 58 / 55°F 79% 1006 mb
Low level cloud: 20%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

9 / 10 mph 60 / 57°F 74% 1006 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 89%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

5 / 5 mph 62 / 60°F 71% 1006 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

0 / 0 mph 59 / 59°F 79% 1006 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
21:00

NNW
NNW

4 / 7 mph 54 / 53°F 93% 1007 mb
Low level cloud: 22%
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
Fri 17
May
00:00

NW
NW

4 / 7 mph 54 / 53°F 97% 1007 mb
Low level cloud: 33%
Mid level cloud: 62%
High level cloud: 77%
Most Significant Cloud Type: low
64%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

W
W

2 / 3 mph 53 / 54°F 97% 1006 mb
Low level cloud: 91%
Mid level cloud: 99%
High level cloud: 68%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

S
S

3 / 4 mph 53 / 53°F 97% 1006 mb
Low level cloud: 72%
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
09:00

SSE
SSE

4 / 5 mph 56 / 54°F 94% 1007 mb
Low level cloud: 60%
Mid level cloud: 61%
High level cloud: 32%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

8 / 9 mph 60 / 58°F 83% 1009 mb
Low level cloud: 32%
Mid level cloud: 15%
High level cloud: 32%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

8 / 9 mph 62 / 60°F 78% 1009 mb
Low level cloud: 3%
Mid level cloud: 6%
High level cloud: 71%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

4 / 5 mph 60 / 58°F 86% 1010 mb
Low level cloud: 16%
Mid level cloud: 6%
High level cloud: 33%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

2 / 5 mph 53 / 52°F 92% 1012 mb
Low level cloud: 5%
Mid level cloud: 4%
High level cloud: 99%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
00:00

NNE
NNE

3 / 6 mph 49 / 49°F 93% 1012 mb
Low level cloud: 11%
Mid level cloud: 98%
High level cloud: 93%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

4 / 9 mph 50 / 48°F 93% 1013 mb
Low level cloud: 6%
Mid level cloud: 86%
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

NNE
NNE

6 / 9 mph 53 / 51°F 94% 1014 mb
Low level cloud: 29%
Mid level cloud: 86%
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

9 / 11 mph 59 / 57°F 87% 1014 mb
Low level cloud: 79%
Mid level cloud: 46%
High level cloud: 30%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

8 / 9 mph 61 / 60°F 82% 1014 mb
Low level cloud: 80%
Mid level cloud: 29%
High level cloud: 15%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

7 / 8 mph 65 / 62°F 82% 1014 mb
Low level cloud: 53%
Mid level cloud: 26%
High level cloud: 32%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

8 / 11 mph 61 / 60°F 89% 1014 mb
Low level cloud: 14%
Mid level cloud: 44%
High level cloud: 11%
Most Significant Cloud Type: medium
84%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

N
N

6 / 13 mph 55 / 51°F 94% 1014 mb
Low level cloud: 17%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

N
N

6 / 11 mph 53 / 51°F 95% 1014 mb
Low level cloud: 15%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

6 / 11 mph 53 / 51°F 95% 1014 mb
Low level cloud: 16%
Mid level cloud: 75%
High level cloud: 84%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

8 / 12 mph 55 / 52°F 94% 1014 mb
Low level cloud: 19%
Mid level cloud: 24%
High level cloud: 43%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

11 / 13 mph 60 / 57°F 80% 1014 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 36%
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 65 / 63°F 71% 1014 mb
Low level cloud: 11%
Mid level cloud: 1%
High level cloud: 11%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

11 / 14 mph 65 / 64°F 68% 1013 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

9 / 12 mph 63 / 62°F 80% 1012 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

6 / 14 mph 53 / 49°F 90% 1013 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

NNE
NNE

5 / 11 mph 51 / 50°F 91% 1013 mb
Low level cloud: 16%
Mid level cloud: 74%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

9 / 13 mph 53 / 51°F 90% 1012 mb
Low level cloud: 15%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

10 / 14 mph 52 / 48°F 92% 1013 mb
Low level cloud: 37%
Mid level cloud: 18%
High level cloud: 12%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

14 / 16 mph 59 / 55°F 83% 1013 mb
Low level cloud: 69%
Mid level cloud: 44%
High level cloud: 5%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

14 / 17 mph 59 / 55°F 82% 1013 mb
Low level cloud: 56%
Mid level cloud: 59%
High level cloud: 2%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

14 / 17 mph 61 / 60°F 79% 1012 mb
Low level cloud: 72%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

10 / 13 mph 61 / 59°F 84% 1012 mb
Low level cloud: 1%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

6 / 12 mph 54 / 51°F 93% 1013 mb
Low level cloud: 2%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 21
May
00:00

SE
SE

11 / 23 mph 50 / 46°F 95% 1013 mb
Low level cloud: 87%
Mid level cloud: 83%
High level cloud: 20%
Most Significant Cloud Type: low
100%
0.2 In
06:00

NNE
NNE

6 / 13 mph 49 / 47°F 94% 1023 mb
Low level cloud: 29%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.0 In
12:00

SSE
SSE

13 / 28 mph 55 / 52°F 83% 1010 mb
Low level cloud: 82%
Mid level cloud: 74%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
Wed 22
May
00:00

W
W

5 / 10 mph 49 / 47°F 96% 1011 mb
Low level cloud: 35%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.0 In
06:00

NW
NW

3 / 5 mph 53 / 54°F 93% 1012 mb
Low level cloud: 36%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: low
52%
0.0 In
12:00

N
N

5 / 10 mph 65 / 65°F 77% 1011 mb
Low level cloud: 91%
Mid level cloud: 13%
High level cloud: 6%
Most Significant Cloud Type: low
96%
0.0 In
18:00

NNW
NNW

7 / 15 mph 62 / 62°F 86% 1013 mb
Low level cloud: 48%
Mid level cloud: 13%
High level cloud: 31%
Most Significant Cloud Type: low
56%
0.0 In
Thu 23
May
00:00

WNW
WNW

4 / 8 mph 57 / 57°F 96% 1010 mb
Low level cloud: 71%
Mid level cloud: 46%
High level cloud: 28%
Most Significant Cloud Type: low
90%
0.1 In
06:00

NE
NE

3 / 7 mph 49 / 49°F 93% 1016 mb
Low level cloud: 84%
Mid level cloud: 25%
High level cloud: 1%
Most Significant Cloud Type: low
92%
0.0 In
12:00

SSW
SSW

7 / 15 mph 60 / 60°F 90% 1012 mb
Low level cloud: 85%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
18:00

N
N

4 / 8 mph 57 / 57°F 87% 1017 mb
Low level cloud: 66%
Mid level cloud: 21%
High level cloud: 4%
Most Significant Cloud Type: low
74%
0.0 In
Fri 24
May
00:00

WNW
WNW

2 / 3 mph 54 / 54°F 95% 1015 mb
Low level cloud: 28%
Mid level cloud: 27%
High level cloud: 10%
Most Significant Cloud Type: low
38%
0.2 In
06:00

NNW
NNW

4 / 9 mph 50 / 49°F 92% 1019 mb
Low level cloud: 14%
Mid level cloud: 14%
High level cloud: 2%
Most Significant Cloud Type: low
19%
0.0 In
12:00

S
S

5 / 11 mph 61 / 61°F 84% 1018 mb
Low level cloud: 84%
Mid level cloud: 32%
High level cloud: 32%
Most Significant Cloud Type: low
99%
0.0 In
18:00

ESE
ESE

3 / 7 mph 59 / 59°F 85% 1021 mb
Low level cloud: 42%
Mid level cloud: 44%
High level cloud: 13%
Most Significant Cloud Type: low
58%
0.0 In
Sat 25
May
00:00

NW
NW

4 / 9 mph 52 / 51°F 96% 1021 mb
Low level cloud: 40%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.2 In
06:00

SE
SE

12 / 26 mph 50 / 46°F 94% 1022 mb
Low level cloud: 49%
Mid level cloud: 42%
High level cloud: 100%
Most Significant Cloud Type: low
75%
0.0 In
12:00

SSW
SSW

2 / 5 mph 67 / 67°F 73% 1023 mb
Low level cloud: 62%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
62%
0.0 In
18:00

SE
SE

13 / 28 mph 53 / 49°F 96% 1020 mb
Low level cloud: 100%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
Sun 26
May
00:00

NNE
NNE

2 / 5 mph 59 / 59°F 93% 1024 mb
Low level cloud: 9%
Mid level cloud: 2%
High level cloud: 14%
Most Significant Cloud Type: low
10%
0.0 In
06:00

SSE
SSE

5 / 11 mph 55 / 54°F 96% 1016 mb
Low level cloud: 70%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
85%
0.1 In
12:00

SSE
SSE

7 / 15 mph 65 / 65°F 79% 1024 mb
Low level cloud: 11%
Mid level cloud: 28%
High level cloud: 90%
Most Significant Cloud Type: low
31%
0.0 In
18:00

SSW
SSW

9 / 19 mph 60 / 60°F 93% 1015 mb
Low level cloud: 66%
Mid level cloud: 84%
High level cloud: 84%
Most Significant Cloud Type: low
100%
0.1 In
Mon 27
May
00:00

ESE
ESE

1 / 2 mph 57 / 57°F 85% 1023 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 98%
Most Significant Cloud Type: medium
13%
0.0 In
06:00

S
S

4 / 9 mph 53 / 52°F 94% 1013 mb
Low level cloud: 74%
Mid level cloud: 92%
High level cloud: 76%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SE
SE

7 / 15 mph 65 / 65°F 74% 1022 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
0.0 In
18:00

S
S

10 / 20 mph 58 / 57°F 89% 1010 mb
Low level cloud: 7%
Mid level cloud: 45%
High level cloud: 5%
Most Significant Cloud Type: medium
65%
0.3 In
Tue 28
May
00:00

ENE
ENE

2 / 4 mph 60 / 60°F 83% 1022 mb
Low level cloud: 0%
Mid level cloud: 59%
High level cloud: 32%
Most Significant Cloud Type: medium
60%
0.0 In
06:00

SSE
SSE

6 / 13 mph 58 / 57°F 94% 1006 mb
Low level cloud: 4%
Mid level cloud: 5%
High level cloud: 4%
Most Significant Cloud Type: low
6%
0.0 In
12:00

E
E

9 / 20 mph 66 / 66°F 77% 1020 mb
Low level cloud: 76%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
98%
0.0 In
18:00

SSE
SSE

7 / 14 mph 62 / 62°F 94% 1004 mb
Low level cloud: 85%
Mid level cloud: 31%
High level cloud: 4%
Most Significant Cloud Type: low
95%
0.0 In
Wed 29
May
00:00

E
E

9 / 19 mph 59 / 57°F 97% 1019 mb
Low level cloud: 97%
Mid level cloud: 97%
High level cloud: 74%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NW
NW

6 / 14 mph 54 / 52°F 96% 1001 mb
Low level cloud: 83%
Mid level cloud: 97%
High level cloud: 84%
Most Significant Cloud Type: low
100%
0.0 In
12:00

E
E

13 / 28 mph 60 / 60°F 86% 1018 mb
Low level cloud: 97%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

9 / 20 mph 60 / 60°F 79% 1001 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 10%
Most Significant Cloud Type: medium
6%
0.4 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