WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Lumsden 14 Day Long Range Forecast

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

Aberdeenshire, United Kingdom

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

The next 14 day outlook for Lumsden shows the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 21°C expected on the afternoon of Wednesday 15th. The mean minimum temperature will be 6°C, dipping to its lowest on the morning of Monday 20th at 2°C. The coming 14 days will have mostly dry days although Friday 17th and Sunday 19th are likely to see a little rain. It looks like Friday 17th will have the most precipitation with an accumulation of around 2.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 15
May
18:00

SE
SE

10 / 12 mph 63 / 62°F 82% 1008 mb
Low level cloud: 4%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

6 / 12 mph 50 / 47°F 98% 1009 mb
Low level cloud: 30%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
May
00:00

SSE
SSE

6 / 11 mph 50 / 47°F 97% 1009 mb
Low level cloud: 51%
Mid level cloud: 5%
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

SSE
SSE

5 / 10 mph 48 / 46°F 96% 1009 mb
Low level cloud: 48%
Mid level cloud: 5%
High level cloud: 8%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

5 / 6 mph 55 / 52°F 93% 1010 mb
Low level cloud: 60%
Mid level cloud: 2%
High level cloud: 21%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

8 / 9 mph 63 / 60°F 82% 1011 mb
Low level cloud: 44%
Mid level cloud: 28%
High level cloud: 32%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

12 / 13 mph 65 / 64°F 78% 1011 mb
Low level cloud: 19%
Mid level cloud: 20%
High level cloud: 32%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

13 / 15 mph 65 / 64°F 75% 1011 mb
Low level cloud: 2%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

9 / 11 mph 62 / 60°F 80% 1013 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

5 / 10 mph 49 / 46°F 96% 1014 mb
Low level cloud: 4%
Mid level cloud: 13%
High level cloud: 5%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 17
May
00:00

SSE
SSE

4 / 8 mph 46 / 44°F 94% 1015 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 16%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

3 / 7 mph 45 / 43°F 94% 1015 mb
Low level cloud: 5%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

2 / 3 mph 53 / 53°F 88% 1015 mb
Low level cloud: 5%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

4 / 5 mph 62 / 60°F 77% 1014 mb
Low level cloud: 18%
Mid level cloud: 13%
High level cloud: 99%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

7 / 9 mph 68 / 65°F 68% 1014 mb
Low level cloud: 47%
Mid level cloud: 14%
High level cloud: 21%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

9 / 11 mph 68 / 66°F 69% 1013 mb
Low level cloud: 11%
Mid level cloud: 8%
High level cloud: 37%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

7 / 10 mph 62 / 60°F 85% 1014 mb
Low level cloud: 2%
Mid level cloud: 14%
High level cloud: 20%
Most Significant Cloud Type: medium
19%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SE
SE

5 / 10 mph 52 / 49°F 94% 1015 mb
Low level cloud: 4%
Mid level cloud: 73%
High level cloud: 68%
Most Significant Cloud Type: medium
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
00:00

S
S

2 / 5 mph 50 / 50°F 94% 1015 mb
Low level cloud: 7%
Mid level cloud: 22%
High level cloud: 70%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

3 / 7 mph 47 / 46°F 96% 1016 mb
Low level cloud: 49%
Mid level cloud: 20%
High level cloud: 33%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

6 / 7 mph 50 / 48°F 96% 1017 mb
Low level cloud: 100%
Mid level cloud: 23%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

5 / 6 mph 51 / 49°F 93% 1018 mb
Low level cloud: 96%
Mid level cloud: 22%
High level cloud: 5%
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 56 / 55°F 83% 1018 mb
Low level cloud: 88%
Mid level cloud: 12%
High level cloud: 11%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

5 / 6 mph 56 / 55°F 84% 1018 mb
Low level cloud: 77%
Mid level cloud: 7%
High level cloud: 13%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

5 / 6 mph 57 / 55°F 82% 1018 mb
Low level cloud: 38%
Mid level cloud: 23%
High level cloud: 11%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

4 / 7 mph 46 / 43°F 94% 1019 mb
Low level cloud: 32%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

NE
NE

2 / 2 mph 47 / 47°F 83% 1020 mb
Low level cloud: 68%
Mid level cloud: 46%
High level cloud: 56%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

2 / 3 mph 47 / 47°F 83% 1020 mb
Low level cloud: 99%
Mid level cloud: 77%
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

3 / 4 mph 48 / 47°F 91% 1021 mb
Low level cloud: 98%
Mid level cloud: 49%
High level cloud: 86%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

5 / 6 mph 49 / 47°F 95% 1022 mb
Low level cloud: 96%
Mid level cloud: 47%
High level cloud: 34%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

8 / 9 mph 54 / 50°F 73% 1023 mb
Low level cloud: 47%
Mid level cloud: 16%
High level cloud: 8%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

9 / 10 mph 54 / 51°F 62% 1023 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 10%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

8 / 9 mph 50 / 47°F 71% 1023 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 8%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

2 / 5 mph 40 / 38°F 93% 1024 mb
Low level cloud: 12%
Mid level cloud: 5%
High level cloud: 6%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

S
S

1 / 2 mph 37 / 37°F 94% 1024 mb
Low level cloud: 18%
Mid level cloud: 5%
High level cloud: 21%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

1 / 3 mph 35 / 35°F 94% 1024 mb
Low level cloud: 16%
Mid level cloud: 5%
High level cloud: 14%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

2 / 2 mph 44 / 43°F 87% 1024 mb
Low level cloud: 18%
Mid level cloud: 4%
High level cloud: 7%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

6 / 7 mph 53 / 49°F 67% 1023 mb
Low level cloud: 2%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

7 / 9 mph 58 / 55°F 56% 1023 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

11 / 12 mph 58 / 55°F 57% 1022 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

10 / 12 mph 52 / 47°F 69% 1022 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
21:00

SE
SE

5 / 11 mph 40 / 36°F 94% 1022 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
Tue 21
May
00:00

SSE
SSE

5 / 10 mph 38 / 34°F 94% 1022 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
03:00

SSE
SSE

4 / 8 mph 36 / 33°F 93% 1021 mb
Low level cloud: 9%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

3 / 4 mph 47 / 46°F 87% 1020 mb
Low level cloud: 65%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

12 / 14 mph 56 / 51°F 73% 1019 mb
Low level cloud: 17%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

17 / 19 mph 61 / 60°F 59% 1018 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 13%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

18 / 21 mph 59 / 55°F 73% 1018 mb
Low level cloud: 46%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

17 / 19 mph 56 / 50°F 84% 1019 mb
Low level cloud: 43%
Mid level cloud: 17%
High level cloud: 80%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

12 / 20 mph 48 / 42°F 88% 1020 mb
Low level cloud: 7%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 22
May
00:00

NW
NW

4 / 8 mph 47 / 45°F 98% 1010 mb
Low level cloud: 59%
Mid level cloud: 32%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
06:00

N
N

11 / 15 mph 43 / 37°F 72% 1017 mb
Low level cloud: 92%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.0 In
12:00

E
E

9 / 11 mph 64 / 64°F 66% 1022 mb
Low level cloud: 0%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: medium
70%
0.0 In
18:00

NNE
NNE

15 / 22 mph 47 / 40°F 69% 1022 mb
Low level cloud: 73%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Thu 23
May
00:00

SSW
SSW

2 / 5 mph 49 / 49°F 78% 1020 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: medium
23%
0.0 In
06:00

SSE
SSE

11 / 19 mph 49 / 44°F 93% 1012 mb
Low level cloud: 37%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: low
66%
0.0 In
12:00

NNE
NNE

8 / 10 mph 54 / 52°F 60% 1028 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 12%
Most Significant Cloud Type: medium
1%
0.0 In
18:00

NNE
NNE

8 / 13 mph 53 / 50°F 80% 1027 mb
Low level cloud: 65%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
Fri 24
May
00:00

SSE
SSE

5 / 10 mph 38 / 34°F 93% 1029 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: medium
5%
0.0 In
06:00

SSE
SSE

4 / 6 mph 48 / 47°F 86% 1025 mb
Low level cloud: 67%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
67%
0.0 In
12:00

SE
SE

13 / 17 mph 64 / 64°F 59% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

SE
SE

10 / 16 mph 56 / 54°F 78% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
8%
0.0 In
Sat 25
May
00:00

SSE
SSE

7 / 14 mph 41 / 36°F 92% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

SSE
SSE

3 / 4 mph 54 / 54°F 89% 1019 mb
Low level cloud: 18%
Mid level cloud: 3%
High level cloud: 11%
Most Significant Cloud Type: low
20%
0.0 In
12:00

SE
SE

16 / 21 mph 63 / 63°F 49% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

SE
SE

7 / 12 mph 62 / 62°F 80% 1015 mb
Low level cloud: 9%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: medium
73%
0.0 In
Sun 26
May
00:00

S
S

6 / 13 mph 42 / 39°F 68% 1022 mb
Low level cloud: 4%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
06:00

NW
NW

4 / 7 mph 53 / 51°F 92% 1016 mb
Low level cloud: 72%
Mid level cloud: 51%
High level cloud: 10%
Most Significant Cloud Type: low
91%
0.0 In
12:00

SSE
SSE

11 / 14 mph 68 / 68°F 71% 1023 mb
Low level cloud: 36%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.0 In
18:00

NNW
NNW

3 / 4 mph 51 / 51°F 92% 1018 mb
Low level cloud: 56%
Mid level cloud: 48%
High level cloud: 6%
Most Significant Cloud Type: low
73%
0.0 In
Mon 27
May
00:00

SSE
SSE

6 / 12 mph 46 / 44°F 92% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

WNW
WNW

6 / 11 mph 50 / 48°F 88% 1017 mb
Low level cloud: 41%
Mid level cloud: 46%
High level cloud: 35%
Most Significant Cloud Type: low
61%
0.0 In
12:00

SE
SE

6 / 8 mph 70 / 70°F 54% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

NW
NW

14 / 23 mph 51 / 46°F 85% 1017 mb
Low level cloud: 92%
Mid level cloud: 2%
High level cloud: 12%
Most Significant Cloud Type: low
93%
0.0 In
Tue 28
May
00:00

NW
NW

2 / 5 mph 52 / 52°F 93% 1020 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
1%
0.0 In
06:00

WSW
WSW

9 / 15 mph 47 / 43°F 73% 1017 mb
Low level cloud: 5%
Mid level cloud: 6%
High level cloud: 10%
Most Significant Cloud Type: low
8%
0.0 In
12:00

E
E

8 / 11 mph 66 / 65°F 55% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

WSW
WSW

12 / 21 mph 50 / 46°F 78% 1013 mb
Low level cloud: 77%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
96%
0.0 In
Wed 29
May
00:00

S
S

3 / 7 mph 49 / 48°F 73% 1016 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 7%
Most Significant Cloud Type: medium
15%
0.0 In
06:00

WSW
WSW

15 / 27 mph 46 / 40°F 88% 1004 mb
Low level cloud: 78%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.1 In
12:00

SE
SE

11 / 14 mph 70 / 70°F 62% 1013 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
18:00

WNW
WNW

21 / 42 mph 51 / 45°F 78% 1003 mb
Low level cloud: 61%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
76%
0.1 In
Thu 30
May
00:00

S
S

6 / 12 mph 47 / 45°F 89% 1010 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
0.0 In
06:00

WNW
WNW

17 / 34 mph 48 / 42°F 80% 1007 mb
Low level cloud: 54%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
60%
0.0 In
12:00

SE
SE

13 / 17 mph 74 / 77°F 58% 1005 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: medium
6%
0.0 In
18:00

NNE
NNE

4 / 9 mph 54 / 53°F 71% 1010 mb
Low level cloud: 2%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: medium
59%
0.0 In

Other Locations Near to Lumsden

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