WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Monasterevan 14 Day Long Range Forecast

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

Kildare, Ireland

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

Reviewing the forecast for Monasterevan Over the next 14 days and the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 21°C expected on the afternoon of Monday 20th. The average minimum temperature will be 9°C, dipping to its lowest on the morning of Friday 24th at 2°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. Current predictions suggest Monday 20th 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
Fri 17
May
18:00

NNE
NNE

7 / 9 mph 65 / 62°F 89% 1013 mb
Low level cloud: 30%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

4 / 8 mph 55 / 55°F 95% 1014 mb
Low level cloud: 84%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
00:00

NNW
NNW

5 / 8 mph 55 / 54°F 98% 1015 mb
Low level cloud: 100%
Mid level cloud: 59%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

6 / 10 mph 53 / 51°F 98% 1016 mb
Low level cloud: 84%
Mid level cloud: 46%
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

NNW
NNW

6 / 9 mph 52 / 49°F 99% 1017 mb
Low level cloud: 93%
Mid level cloud: 83%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

8 / 10 mph 55 / 52°F 95% 1018 mb
Low level cloud: 95%
Mid level cloud: 67%
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

N
N

9 / 11 mph 60 / 60°F 86% 1018 mb
Low level cloud: 97%
Mid level cloud: 11%
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

N
N

9 / 11 mph 64 / 62°F 80% 1017 mb
Low level cloud: 76%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

8 / 11 mph 66 / 63°F 81% 1017 mb
Low level cloud: 24%
Mid level cloud: 13%
High level cloud: 1%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

5 / 11 mph 57 / 54°F 97% 1018 mb
Low level cloud: 31%
Mid level cloud: 26%
High level cloud: 5%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

N
N

6 / 12 mph 51 / 49°F 97% 1019 mb
Low level cloud: 12%
Mid level cloud: 19%
High level cloud: 9%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

6 / 12 mph 47 / 44°F 96% 1018 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 15%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

4 / 9 mph 48 / 45°F 93% 1019 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 20%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

6 / 7 mph 60 / 58°F 77% 1019 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 18%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

6 / 7 mph 69 / 67°F 69% 1018 mb
Low level cloud: 24%
Mid level cloud: 21%
High level cloud: 8%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

7 / 10 mph 68 / 67°F 80% 1017 mb
Low level cloud: 75%
Mid level cloud: 14%
High level cloud: 7%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

7 / 10 mph 66 / 64°F 88% 1017 mb
Low level cloud: 9%
Mid level cloud: 7%
High level cloud: 6%
Most Significant Cloud Type: low
11%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

ENE
ENE

2 / 4 mph 57 / 57°F 94% 1017 mb
Low level cloud: 5%
Mid level cloud: 10%
High level cloud: 5%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

SE
SE

2 / 4 mph 52 / 53°F 93% 1017 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

2 / 3 mph 49 / 49°F 90% 1016 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 1%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

2 / 3 mph 53 / 51°F 88% 1016 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 1%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

3 / 4 mph 65 / 62°F 71% 1015 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 6%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

5 / 6 mph 70 / 67°F 61% 1014 mb
Low level cloud: 5%
Mid level cloud: 25%
High level cloud: 13%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

4 / 6 mph 68 / 66°F 76% 1013 mb
Low level cloud: 60%
Mid level cloud: 44%
High level cloud: 45%
Most Significant Cloud Type: low
80%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SE
SE

3 / 4 mph 63 / 60°F 92% 1012 mb
Low level cloud: 28%
Mid level cloud: 51%
High level cloud: 96%
Most Significant Cloud Type: low
56%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
21:00

SW
SW

0 / 1 mph 56 / 56°F 95% 1012 mb
Low level cloud: 16%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
Tue 21
May
00:00

S
S

0 / 1 mph 54 / 54°F 95% 1011 mb
Low level cloud: 34%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

1 / 2 mph 52 / 52°F 96% 1011 mb
Low level cloud: 38%
Mid level cloud: 44%
High level cloud: 74%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

2 / 3 mph 51 / 51°F 97% 1010 mb
Low level cloud: 63%
Mid level cloud: 63%
High level cloud: 100%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

2 / 3 mph 54 / 54°F 95% 1010 mb
Low level cloud: 78%
Mid level cloud: 99%
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

2 / 2 mph 58 / 57°F 93% 1010 mb
Low level cloud: 52%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
94%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

SSE
SSE

2 / 2 mph 61 / 59°F 94% 1010 mb
Low level cloud: 36%
Mid level cloud: 76%
High level cloud: 45%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

1 / 1 mph 60 / 58°F 93% 1010 mb
Low level cloud: 43%
Mid level cloud: 50%
High level cloud: 21%
Most Significant Cloud Type: low
63%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNE
NNE

5 / 7 mph 56 / 54°F 98% 1011 mb
Low level cloud: 74%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: low
90%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 22
May
00:00

NNW
NNW

4 / 7 mph 54 / 53°F 99% 1012 mb
Low level cloud: 94%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

NNW
NNW

5 / 9 mph 51 / 49°F 99% 1012 mb
Low level cloud: 83%
Mid level cloud: 47%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

5 / 7 mph 52 / 51°F 98% 1014 mb
Low level cloud: 84%
Mid level cloud: 45%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

9 / 11 mph 55 / 53°F 94% 1015 mb
Low level cloud: 94%
Mid level cloud: 49%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

11 / 15 mph 56 / 53°F 93% 1016 mb
Low level cloud: 91%
Mid level cloud: 46%
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

NNW
NNW

11 / 14 mph 56 / 53°F 89% 1016 mb
Low level cloud: 91%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

12 / 18 mph 52 / 47°F 92% 1018 mb
Low level cloud: 94%
Mid level cloud: 80%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

10 / 17 mph 48 / 43°F 88% 1020 mb
Low level cloud: 31%
Mid level cloud: 29%
High level cloud: 14%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

NNW
NNW

9 / 15 mph 42 / 37°F 87% 1021 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 5%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

9 / 18 mph 40 / 33°F 84% 1021 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 5%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

11 / 17 mph 43 / 36°F 80% 1020 mb
Low level cloud: 1%
Mid level cloud: 6%
High level cloud: 61%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

12 / 14 mph 51 / 46°F 66% 1020 mb
Low level cloud: 73%
Mid level cloud: 2%
High level cloud: 17%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

11 / 13 mph 55 / 52°F 59% 1019 mb
Low level cloud: 94%
Mid level cloud: 1%
High level cloud: 33%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

11 / 13 mph 59 / 56°F 56% 1017 mb
Low level cloud: 28%
Mid level cloud: 46%
High level cloud: 47%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

11 / 15 mph 55 / 51°F 68% 1017 mb
Low level cloud: 34%
Mid level cloud: 6%
High level cloud: 14%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

8 / 15 mph 45 / 40°F 79% 1018 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 71%
Most Significant Cloud Type: low
25%
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

W
W

5 / 11 mph 42 / 38°F 95% 1015 mb
Low level cloud: 2%
Mid level cloud: 11%
High level cloud: 52%
Most Significant Cloud Type: medium
17%
0.0 In
06:00

NW
NW

2 / 5 mph 47 / 47°F 90% 1016 mb
Low level cloud: 6%
Mid level cloud: 1%
High level cloud: 96%
Most Significant Cloud Type: medium
21%
0.0 In
12:00

ESE
ESE

13 / 28 mph 61 / 61°F 78% 1016 mb
Low level cloud: 92%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
94%
0.0 In
18:00

NE
NE

10 / 21 mph 64 / 64°F 80% 1019 mb
Low level cloud: 41%
Mid level cloud: 26%
High level cloud: 13%
Most Significant Cloud Type: low
51%
0.0 In
Sat 25
May
00:00

ENE
ENE

3 / 6 mph 57 / 58°F 92% 1021 mb
Low level cloud: 84%
Mid level cloud: 21%
High level cloud: 33%
Most Significant Cloud Type: low
94%
0.0 In
06:00

S
S

6 / 13 mph 54 / 52°F 96% 1022 mb
Low level cloud: 84%
Mid level cloud: 3%
High level cloud: 32%
Most Significant Cloud Type: low
88%
0.0 In
12:00

S
S

15 / 33 mph 52 / 47°F 87% 1015 mb
Low level cloud: 94%
Mid level cloud: 45%
High level cloud: 15%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSE
SSE

12 / 25 mph 59 / 59°F 77% 1015 mb
Low level cloud: 11%
Mid level cloud: 55%
High level cloud: 100%
Most Significant Cloud Type: medium
88%
0.0 In
Sun 26
May
00:00

ESE
ESE

7 / 14 mph 52 / 50°F 93% 1011 mb
Low level cloud: 96%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSE
SSE

8 / 17 mph 49 / 45°F 96% 1013 mb
Low level cloud: 95%
Mid level cloud: 97%
High level cloud: 16%
Most Significant Cloud Type: low
100%
0.2 In
12:00

E
E

8 / 16 mph 62 / 62°F 75% 1013 mb
Low level cloud: 90%
Mid level cloud: 45%
High level cloud: 64%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

13 / 28 mph 55 / 52°F 76% 1015 mb
Low level cloud: 11%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.5 In
Mon 27
May
00:00

NNE
NNE

6 / 13 mph 52 / 50°F 99% 1015 mb
Low level cloud: 59%
Mid level cloud: 46%
High level cloud: 8%
Most Significant Cloud Type: low
76%
0.0 In
06:00

W
W

6 / 13 mph 43 / 40°F 88% 1019 mb
Low level cloud: 10%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.0 In
12:00

ENE
ENE

7 / 15 mph 66 / 67°F 66% 1017 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
18:00

NW
NW

9 / 18 mph 53 / 50°F 73% 1021 mb
Low level cloud: 5%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.1 In
Tue 28
May
00:00

SW
SW

2 / 5 mph 55 / 56°F 93% 1015 mb
Low level cloud: 52%
Mid level cloud: 22%
High level cloud: 73%
Most Significant Cloud Type: low
68%
0.0 In
06:00

WSW
WSW

3 / 6 mph 45 / 44°F 91% 1025 mb
Low level cloud: 10%
Mid level cloud: 20%
High level cloud: 5%
Most Significant Cloud Type: low
17%
0.0 In
12:00

WSW
WSW

9 / 18 mph 62 / 62°F 68% 1013 mb
Low level cloud: 29%
Mid level cloud: 50%
High level cloud: 32%
Most Significant Cloud Type: low
50%
0.0 In
18:00

SW
SW

5 / 10 mph 56 / 56°F 72% 1023 mb
Low level cloud: 27%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: low
44%
0.0 In
Wed 29
May
00:00

W
W

6 / 13 mph 43 / 39°F 95% 1012 mb
Low level cloud: 24%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.0 In
06:00

SSE
SSE

12 / 26 mph 50 / 45°F 98% 1017 mb
Low level cloud: 98%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
12:00

WSW
WSW

13 / 27 mph 54 / 51°F 67% 1010 mb
Low level cloud: 94%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NW
NW

11 / 22 mph 54 / 51°F 86% 1017 mb
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 99%
Most Significant Cloud Type: medium
35%
0.1 In
Thu 30
May
00:00

WSW
WSW

7 / 14 mph 42 / 37°F 96% 1010 mb
Low level cloud: 24%
Mid level cloud: 27%
High level cloud: 3%
Most Significant Cloud Type: low
34%
0.0 In
06:00

WNW
WNW

7 / 14 mph 49 / 46°F 73% 1020 mb
Low level cloud: 60%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: low
73%
0.0 In
12:00

WSW
WSW

10 / 20 mph 53 / 50°F 78% 1008 mb
Low level cloud: 57%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
18:00

WNW
WNW

12 / 26 mph 57 / 54°F 74% 1021 mb
Low level cloud: 15%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: medium
88%
0.0 In
Fri 31
May
00:00

WNW
WNW

6 / 12 mph 39 / 35°F 96% 1010 mb
Low level cloud: 4%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
33%
0.1 In
06:00

SW
SW

9 / 18 mph 50 / 46°F 88% 1020 mb
Low level cloud: 63%
Mid level cloud: 51%
High level cloud: 68%
Most Significant Cloud Type: low
89%
0.0 In
12:00

WNW
WNW

13 / 26 mph 55 / 52°F 67% 1013 mb
Low level cloud: 65%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
70%
0.0 In
18:00

WSW
WSW

13 / 27 mph 56 / 53°F 88% 1016 mb
Low level cloud: 100%
Mid level cloud: 45%
High level cloud: 15%
Most Significant Cloud Type: low
100%
0.0 In
Sat 01
Jun
00:00

W
W

4 / 9 mph 41 / 38°F 95% 1017 mb
Low level cloud: 20%
Mid level cloud: 12%
High level cloud: 9%
Most Significant Cloud Type: low
25%
0.1 In
06:00

W
W

9 / 19 mph 51 / 47°F 77% 1020 mb
Low level cloud: 70%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: low
84%
0.0 In
12:00

SE
SE

3 / 7 mph 59 / 59°F 58% 1019 mb
Low level cloud: 85%
Mid level cloud: 8%
High level cloud: 22%
Most Significant Cloud Type: low
90%
0.0 In
18:00

SSW
SSW

9 / 19 mph 61 / 61°F 73% 1019 mb
Low level cloud: 12%
Mid level cloud: 44%
High level cloud: 87%
Most Significant Cloud Type: medium
82%
0.0 In

Other Locations Near to Monasterevan

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