WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Eastheath 14 Day Long Range Forecast

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

Berkshire, United Kingdom

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

The forecast for Eastheath in the coming two weeks is predicting 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 Sunday 19th. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Tuesday 21st at 6°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain. The current forecast indicates Sunday 26th will have the most precipitation with an accumulation of around 6.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
May
18:00

W
W

5 / 8 mph 65 / 62°F 83% 1011 mb
Low level cloud: 3%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

4 / 9 mph 57 / 56°F 88% 1012 mb
Low level cloud: 1%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
00:00

NNW
NNW

5 / 9 mph 55 / 55°F 90% 1012 mb
Low level cloud: 1%
Mid level cloud: 43%
High level cloud: 35%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

5 / 9 mph 53 / 52°F 96% 1012 mb
Low level cloud: 22%
Mid level cloud: 27%
High level cloud: 35%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

4 / 6 mph 55 / 52°F 93% 1013 mb
Low level cloud: 29%
Mid level cloud: 62%
High level cloud: 98%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

4 / 6 mph 57 / 57°F 88% 1013 mb
Low level cloud: 90%
Mid level cloud: 88%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

9 / 10 mph 63 / 63°F 78% 1013 mb
Low level cloud: 93%
Mid level cloud: 76%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

9 / 11 mph 63 / 63°F 81% 1013 mb
Low level cloud: 79%
Mid level cloud: 59%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

6 / 8 mph 67 / 64°F 84% 1013 mb
Low level cloud: 44%
Mid level cloud: 28%
High level cloud: 3%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

7 / 13 mph 56 / 54°F 95% 1014 mb
Low level cloud: 7%
Mid level cloud: 36%
High level cloud: 10%
Most Significant Cloud Type: medium
54%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sun 19
May
00:00

NNE
NNE

6 / 11 mph 51 / 48°F 97% 1015 mb
Low level cloud: 39%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

6 / 11 mph 48 / 46°F 98% 1015 mb
Low level cloud: 68%
Mid level cloud: 22%
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

NE
NE

8 / 12 mph 51 / 47°F 96% 1016 mb
Low level cloud: 88%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

9 / 11 mph 62 / 60°F 78% 1016 mb
Low level cloud: 27%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

10 / 11 mph 68 / 66°F 60% 1015 mb
Low level cloud: 39%
Mid level cloud: 2%
High level cloud: 3%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

11 / 14 mph 69 / 67°F 58% 1015 mb
Low level cloud: 24%
Mid level cloud: 32%
High level cloud: 1%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

11 / 17 mph 64 / 62°F 82% 1015 mb
Low level cloud: 29%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

7 / 8 mph 60 / 60°F 93% 1016 mb
Low level cloud: 1%
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

NNE
NNE

6 / 9 mph 52 / 50°F 93% 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

6 / 10 mph 47 / 45°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
06:00

NNE
NNE

7 / 11 mph 49 / 45°F 92% 1015 mb
Low level cloud: 18%
Mid level cloud: 0%
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 59 / 56°F 75% 1014 mb
Low level cloud: 13%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

11 / 13 mph 66 / 64°F 64% 1013 mb
Low level cloud: 38%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

13 / 16 mph 66 / 65°F 66% 1012 mb
Low level cloud: 17%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

11 / 14 mph 63 / 61°F 78% 1011 mb
Low level cloud: 16%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

7 / 13 mph 51 / 49°F 87% 1012 mb
Low level cloud: 2%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

NNE
NNE

6 / 10 mph 48 / 46°F 89% 1011 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

5 / 9 mph 46 / 43°F 90% 1010 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

5 / 8 mph 48 / 45°F 81% 1010 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 50%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

5 / 6 mph 58 / 56°F 65% 1010 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 3%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

N
N

3 / 4 mph 66 / 64°F 59% 1009 mb
Low level cloud: 2%
Mid level cloud: 10%
High level cloud: 32%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

4 / 5 mph 68 / 65°F 59% 1009 mb
Low level cloud: 20%
Mid level cloud: 10%
High level cloud: 90%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

5 / 7 mph 67 / 64°F 76% 1009 mb
Low level cloud: 7%
Mid level cloud: 32%
High level cloud: 100%
Most Significant Cloud Type: medium
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

4 / 7 mph 57 / 57°F 83% 1010 mb
Low level cloud: 28%
Mid level cloud: 74%
High level cloud: 97%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

NW
NW

3 / 6 mph 55 / 55°F 85% 1010 mb
Low level cloud: 13%
Mid level cloud: 88%
High level cloud: 99%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

4 / 7 mph 54 / 53°F 84% 1010 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
06:00

NW
NW

4 / 7 mph 56 / 54°F 86% 1010 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

7 / 9 mph 63 / 61°F 73% 1010 mb
Low level cloud: 5%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

9 / 11 mph 65 / 62°F 75% 1010 mb
Low level cloud: 4%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

9 / 12 mph 65 / 62°F 77% 1010 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 100%
Most Significant Cloud Type: medium
31%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

N
N

6 / 9 mph 60 / 58°F 88% 1011 mb
Low level cloud: 5%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
60%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

ENE
ENE

3 / 5 mph 54 / 55°F 93% 1012 mb
Low level cloud: 48%
Mid level cloud: 100%
High level cloud: 50%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

WNW
WNW

5 / 9 mph 53 / 52°F 95% 1012 mb
Low level cloud: 56%
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
03:00

NW
NW

7 / 10 mph 52 / 50°F 98% 1013 mb
Low level cloud: 81%
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
06:00

WNW
WNW

8 / 11 mph 52 / 49°F 97% 1013 mb
Low level cloud: 84%
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
09:00

NW
NW

9 / 13 mph 53 / 50°F 94% 1014 mb
Low level cloud: 86%
Mid level cloud: 75%
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

NW
NW

9 / 11 mph 57 / 55°F 81% 1015 mb
Low level cloud: 82%
Mid level cloud: 43%
High level cloud: 92%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

7 / 9 mph 60 / 60°F 75% 1015 mb
Low level cloud: 75%
Mid level cloud: 30%
High level cloud: 97%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

4 / 6 mph 61 / 60°F 82% 1015 mb
Low level cloud: 70%
Mid level cloud: 29%
High level cloud: 57%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

5 / 9 mph 55 / 52°F 95% 1017 mb
Low level cloud: 40%
Mid level cloud: 4%
High level cloud: 63%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
May
00:00

NW
NW

9 / 19 mph 55 / 52°F 97% 1011 mb
Low level cloud: 84%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NE
NE

4 / 8 mph 50 / 49°F 96% 1014 mb
Low level cloud: 100%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ENE
ENE

9 / 19 mph 59 / 57°F 85% 1016 mb
Low level cloud: 94%
Mid level cloud: 56%
High level cloud: 35%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SE
SE

9 / 18 mph 65 / 65°F 78% 1018 mb
Low level cloud: 9%
Mid level cloud: 9%
High level cloud: 32%
Most Significant Cloud Type: low
15%
0.0 In
Sat 25
May
00:00

NE
NE

15 / 32 mph 55 / 51°F 95% 1017 mb
Low level cloud: 78%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
82%
0.0 In
06:00

NW
NW

4 / 8 mph 61 / 61°F 91% 1024 mb
Low level cloud: 23%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
24%
0.0 In
12:00

WSW
WSW

8 / 17 mph 60 / 60°F 57% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
0.0 In
18:00

SSE
SSE

8 / 17 mph 67 / 67°F 73% 1020 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
Sun 26
May
00:00

E
E

5 / 11 mph 61 / 61°F 95% 1014 mb
Low level cloud: 15%
Mid level cloud: 53%
High level cloud: 90%
Most Significant Cloud Type: medium
98%
0.0 In
06:00

ESE
ESE

6 / 12 mph 56 / 55°F 88% 1018 mb
Low level cloud: 2%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: medium
27%
0.0 In
12:00

E
E

12 / 26 mph 62 / 62°F 85% 1012 mb
Low level cloud: 1%
Mid level cloud: 56%
High level cloud: 100%
Most Significant Cloud Type: medium
62%
0.1 In
18:00

WSW
WSW

6 / 12 mph 61 / 61°F 83% 1015 mb
Low level cloud: 41%
Mid level cloud: 59%
High level cloud: 100%
Most Significant Cloud Type: low
74%
0.2 In
Mon 27
May
00:00

NE
NE

11 / 23 mph 55 / 52°F 95% 1012 mb
Low level cloud: 65%
Mid level cloud: 87%
High level cloud: 49%
Most Significant Cloud Type: low
100%
0.1 In
06:00

WNW
WNW

10 / 20 mph 49 / 45°F 91% 1017 mb
Low level cloud: 28%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
12:00

NE
NE

15 / 31 mph 64 / 64°F 75% 1014 mb
Low level cloud: 51%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
57%
0.0 In
18:00

WNW
WNW

9 / 18 mph 59 / 57°F 73% 1019 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
Tue 28
May
00:00

NNE
NNE

6 / 13 mph 54 / 53°F 96% 1014 mb
Low level cloud: 32%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.0 In
06:00

WNW
WNW

3 / 7 mph 53 / 53°F 84% 1023 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
12:00

SSW
SSW

1 / 1 mph 71 / 71°F 64% 1012 mb
Low level cloud: 34%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: low
48%
0.0 In
18:00

NW
NW

5 / 10 mph 63 / 63°F 79% 1023 mb
Low level cloud: 12%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
22%
0.1 In
Wed 29
May
00:00

W
W

5 / 11 mph 62 / 62°F 93% 1010 mb
Low level cloud: 1%
Mid level cloud: 8%
High level cloud: 32%
Most Significant Cloud Type: medium
13%
0.0 In
06:00

WSW
WSW

2 / 4 mph 55 / 56°F 86% 1022 mb
Low level cloud: 6%
Mid level cloud: 5%
High level cloud: 7%
Most Significant Cloud Type: low
8%
0.0 In
12:00

NW
NW

11 / 23 mph 57 / 55°F 82% 1010 mb
Low level cloud: 61%
Mid level cloud: 46%
High level cloud: 14%
Most Significant Cloud Type: low
78%
0.0 In
18:00

SW
SW

9 / 18 mph 52 / 49°F 79% 1020 mb
Low level cloud: 84%
Mid level cloud: 91%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Thu 30
May
00:00

W
W

7 / 15 mph 49 / 46°F 88% 1012 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

SSW
SSW

6 / 12 mph 53 / 52°F 97% 1018 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 47%
Most Significant Cloud Type: low
100%
0.1 In
12:00

WSW
WSW

10 / 22 mph 59 / 59°F 62% 1010 mb
Low level cloud: 42%
Mid level cloud: 18%
High level cloud: 2%
Most Significant Cloud Type: low
48%
0.0 In
18:00

NNW
NNW

8 / 17 mph 59 / 59°F 78% 1020 mb
Low level cloud: 30%
Mid level cloud: 19%
High level cloud: 47%
Most Significant Cloud Type: low
42%
0.0 In
Fri 31
May
00:00

SW
SW

6 / 12 mph 53 / 51°F 96% 1010 mb
Low level cloud: 16%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.1 In
06:00

WNW
WNW

3 / 6 mph 56 / 57°F 85% 1022 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: medium
15%
0.0 In
12:00

W
W

10 / 21 mph 59 / 59°F 62% 1009 mb
Low level cloud: 83%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.0 In
18:00

W
W

10 / 21 mph 57 / 55°F 76% 1021 mb
Low level cloud: 11%
Mid level cloud: 75%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Sat 01
Jun
00:00

WNW
WNW

7 / 15 mph 48 / 45°F 93% 1015 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.2 In
06:00

SW
SW

9 / 18 mph 54 / 51°F 89% 1021 mb
Low level cloud: 83%
Mid level cloud: 4%
High level cloud: 15%
Most Significant Cloud Type: low
85%
0.0 In
12:00

NW
NW

7 / 15 mph 61 / 62°F 57% 1018 mb
Low level cloud: 72%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
79%
0.0 In
18:00

W
W

8 / 17 mph 67 / 67°F 75% 1022 mb
Low level cloud: 5%
Mid level cloud: 5%
High level cloud: 33%
Most Significant Cloud Type: low
10%
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