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Porto 14 Day Long Range Forecast

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

Portugal

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

Over the next 14 days the Porto forecast suggests the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 23°C expected on the afternoon of Friday 2nd. The average minimum temperature will be 13°C, dipping to its lowest on the morning of Thursday 1st at 11°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. The indicators are that Wednesday 30th will have the most precipitation with an accumulation of around 18.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 30
Apr
15:00

SE
SE

7 / 8 mph 64 / 61°F 77% 1012 mb
Low level cloud: 6%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
64%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

ENE
ENE

8 / 9 mph 63 / 61°F 84% 1011 mb
Low level cloud: 35%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

7 / 8 mph 59 / 60°F 85% 1014 mb
Low level cloud: 26%
Mid level cloud: 23%
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 01
May
00:00

SE
SE

7 / 11 mph 57 / 55°F 85% 1014 mb
Low level cloud: 6%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

6 / 10 mph 54 / 52°F 85% 1013 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 8%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

5 / 10 mph 52 / 51°F 83% 1014 mb
Low level cloud: 12%
Mid level cloud: 14%
High level cloud: 3%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

6 / 8 mph 64 / 62°F 70% 1014 mb
Low level cloud: 12%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

6 / 7 mph 70 / 67°F 58% 1013 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 7%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

9 / 10 mph 69 / 67°F 61% 1011 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 22%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

11 / 12 mph 67 / 66°F 70% 1011 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 33%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

8 / 9 mph 64 / 64°F 77% 1010 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 25%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 02
May
00:00

E
E

4 / 6 mph 60 / 60°F 77% 1008 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 9%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

6 / 10 mph 57 / 56°F 89% 1007 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 1%
Most Significant Cloud Type: medium
30%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

E
E

5 / 10 mph 55 / 55°F 87% 1007 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 6%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

5 / 6 mph 66 / 64°F 80% 1008 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 33%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

3 / 4 mph 73 / 69°F 67% 1006 mb
Low level cloud: 37%
Mid level cloud: 44%
High level cloud: 17%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

14 / 21 mph 67 / 67°F 76% 1005 mb
Low level cloud: 72%
Mid level cloud: 57%
High level cloud: 30%
Most Significant Cloud Type: low
95%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

S
S

23 / 37 mph 59 / 55°F 88% 1006 mb
Low level cloud: 50%
Mid level cloud: 32%
High level cloud: 7%
Most Significant Cloud Type: low
62%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

S
S

13 / 20 mph 57 / 54°F 90% 1010 mb
Low level cloud: 24%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 03
May
00:00

SSE
SSE

9 / 16 mph 57 / 55°F 90% 1010 mb
Low level cloud: 31%
Mid level cloud: 28%
High level cloud: 2%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

11 / 22 mph 56 / 53°F 85% 1009 mb
Low level cloud: 38%
Mid level cloud: 100%
High level cloud: 9%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

12 / 23 mph 55 / 52°F 84% 1009 mb
Low level cloud: 31%
Mid level cloud: 50%
High level cloud: 32%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

17 / 22 mph 58 / 54°F 90% 1010 mb
Low level cloud: 76%
Mid level cloud: 53%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
12:00

S
S

19 / 26 mph 61 / 61°F 85% 1011 mb
Low level cloud: 67%
Mid level cloud: 46%
High level cloud: 8%
Most Significant Cloud Type: low
84%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

SSW
SSW

15 / 21 mph 63 / 62°F 85% 1010 mb
Low level cloud: 60%
Mid level cloud: 45%
High level cloud: 18%
Most Significant Cloud Type: low
77%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SSW
SSW

15 / 19 mph 62 / 61°F 86% 1011 mb
Low level cloud: 34%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

15 / 19 mph 59 / 56°F 90% 1012 mb
Low level cloud: 94%
Mid level cloud: 25%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 04
May
00:00

S
S

11 / 18 mph 57 / 55°F 92% 1011 mb
Low level cloud: 86%
Mid level cloud: 47%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

SW
SW

7 / 11 mph 57 / 56°F 91% 1011 mb
Low level cloud: 28%
Mid level cloud: 43%
High level cloud: 18%
Most Significant Cloud Type: low
45%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

SW
SW

2 / 3 mph 56 / 56°F 89% 1012 mb
Low level cloud: 74%
Mid level cloud: 81%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

WSW
WSW

6 / 10 mph 57 / 56°F 85% 1013 mb
Low level cloud: 75%
Mid level cloud: 61%
High level cloud: 13%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

9 / 13 mph 60 / 56°F 87% 1014 mb
Low level cloud: 42%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

12 / 18 mph 60 / 56°F 83% 1015 mb
Low level cloud: 47%
Mid level cloud: 44%
High level cloud: 8%
Most Significant Cloud Type: low
63%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SW
SW

11 / 15 mph 60 / 56°F 87% 1015 mb
Low level cloud: 45%
Mid level cloud: 52%
High level cloud: 10%
Most Significant Cloud Type: low
64%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SSW
SSW

9 / 12 mph 58 / 56°F 89% 1016 mb
Low level cloud: 70%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 05
May
00:00

S
S

7 / 10 mph 57 / 56°F 89% 1016 mb
Low level cloud: 92%
Mid level cloud: 59%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

8 / 11 mph 56 / 54°F 91% 1016 mb
Low level cloud: 95%
Mid level cloud: 85%
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

SSE
SSE

8 / 12 mph 55 / 53°F 93% 1016 mb
Low level cloud: 97%
Mid level cloud: 97%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

7 / 8 mph 58 / 56°F 93% 1017 mb
Low level cloud: 73%
Mid level cloud: 53%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

S
S

6 / 6 mph 64 / 61°F 81% 1017 mb
Low level cloud: 43%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

6 / 8 mph 65 / 62°F 76% 1016 mb
Low level cloud: 18%
Mid level cloud: 20%
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

WNW
WNW

6 / 7 mph 65 / 62°F 77% 1016 mb
Low level cloud: 3%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

4 / 4 mph 60 / 60°F 86% 1017 mb
Low level cloud: 4%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 06
May
00:00

N
N

3 / 4 mph 58 / 58°F 89% 1017 mb
Low level cloud: 16%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

3 / 5 mph 55 / 56°F 89% 1016 mb
Low level cloud: 37%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

4 / 6 mph 54 / 54°F 89% 1016 mb
Low level cloud: 48%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

3 / 4 mph 64 / 62°F 76% 1017 mb
Low level cloud: 48%
Mid level cloud: 1%
High level cloud: 2%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

11 / 13 mph 63 / 62°F 75% 1016 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

11 / 13 mph 65 / 64°F 67% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
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

NNW
NNW

10 / 11 mph 66 / 64°F 66% 1015 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

5 / 6 mph 64 / 64°F 74% 1016 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 07
May
00:00

E
E

4 / 10 mph 68 / 68°F 75% 1017 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

E
E

2 / 4 mph 66 / 66°F 83% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
12:00

NW
NW

15 / 32 mph 63 / 64°F 65% 1014 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
18:00

NW
NW

10 / 21 mph 64 / 64°F 76% 1015 mb
Low level cloud: 18%
Mid level cloud: 13%
High level cloud: 4%
Most Significant Cloud Type: low
22%
0.0 In
Thu 08
May
00:00

WNW
WNW

3 / 6 mph 60 / 60°F 78% 1018 mb
Low level cloud: 55%
Mid level cloud: 5%
High level cloud: 20%
Most Significant Cloud Type: low
59%
0.0 In
06:00

SSE
SSE

5 / 10 mph 58 / 57°F 89% 1016 mb
Low level cloud: 26%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.0 In
12:00

NW
NW

10 / 21 mph 59 / 59°F 78% 1011 mb
Low level cloud: 9%
Mid level cloud: 23%
High level cloud: 11%
Most Significant Cloud Type: low
18%
0.0 In
18:00

NW
NW

14 / 29 mph 62 / 62°F 75% 1013 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: medium
6%
0.0 In
Fri 09
May
00:00

NNW
NNW

15 / 31 mph 56 / 52°F 77% 1011 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 1%
Most Significant Cloud Type: medium
10%
0.0 In
06:00

NNE
NNE

2 / 5 mph 58 / 59°F 87% 1013 mb
Low level cloud: 29%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: low
30%
0.0 In
12:00

WNW
WNW

7 / 15 mph 60 / 60°F 68% 1013 mb
Low level cloud: 14%
Mid level cloud: 32%
High level cloud: 7%
Most Significant Cloud Type: low
26%
0.0 In
18:00

NW
NW

14 / 29 mph 60 / 60°F 72% 1014 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 22%
Most Significant Cloud Type: medium
4%
0.0 In
Sat 10
May
00:00

WNW
WNW

3 / 5 mph 60 / 60°F 76% 1015 mb
Low level cloud: 48%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: low
49%
0.0 In
06:00

ENE
ENE

2 / 4 mph 57 / 58°F 85% 1016 mb
Low level cloud: 66%
Mid level cloud: 4%
High level cloud: 17%
Most Significant Cloud Type: low
70%
0.0 In
12:00

WSW
WSW

5 / 11 mph 63 / 63°F 60% 1017 mb
Low level cloud: 22%
Mid level cloud: 13%
High level cloud: 4%
Most Significant Cloud Type: low
26%
0.0 In
18:00

NW
NW

7 / 15 mph 66 / 66°F 75% 1017 mb
Low level cloud: 3%
Mid level cloud: 13%
High level cloud: 12%
Most Significant Cloud Type: medium
22%
0.0 In
Sun 11
May
00:00

ENE
ENE

3 / 7 mph 62 / 62°F 68% 1017 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 14%
Most Significant Cloud Type: medium
46%
0.0 In
06:00

SSW
SSW

2 / 4 mph 59 / 59°F 85% 1018 mb
Low level cloud: 49%
Mid level cloud: 22%
High level cloud: 1%
Most Significant Cloud Type: low
56%
0.0 In
12:00

W
W

8 / 17 mph 67 / 67°F 58% 1017 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 3%
Most Significant Cloud Type: medium
21%
0.0 In
18:00

W
W

5 / 11 mph 69 / 69°F 76% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Mon 12
May
00:00

NNW
NNW

3 / 6 mph 68 / 69°F 78% 1016 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
06:00

SSE
SSE

4 / 9 mph 59 / 59°F 78% 1014 mb
Low level cloud: 73%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
76%
0.0 In
12:00

W
W

7 / 15 mph 67 / 67°F 64% 1016 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 12%
Most Significant Cloud Type: medium
9%
0.0 In
18:00

NW
NW

12 / 26 mph 61 / 61°F 77% 1011 mb
Low level cloud: 20%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
43%
0.0 In
Tue 13
May
00:00

N
N

4 / 9 mph 61 / 61°F 84% 1017 mb
Low level cloud: 1%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: medium
50%
0.0 In
06:00

NNE
NNE

9 / 19 mph 53 / 50°F 80% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 7%
Most Significant Cloud Type: medium
2%
0.0 In
12:00

WNW
WNW

11 / 24 mph 62 / 62°F 69% 1017 mb
Low level cloud: 0%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: medium
49%
0.0 In
18:00

NNW
NNW

22 / 46 mph 62 / 62°F 54% 1014 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 3%
Most Significant Cloud Type: high
2%
0.0 In
Wed 14
May
00:00

N
N

4 / 9 mph 64 / 65°F 82% 1016 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 4%
Most Significant Cloud Type: medium
9%
0.0 In
06:00

NE
NE

7 / 15 mph 54 / 53°F 64% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

WNW
WNW

9 / 18 mph 66 / 66°F 67% 1015 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
18:00

NNW
NNW

23 / 48 mph 60 / 60°F 70% 1018 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
Thu 15
May
00:00

WNW
WNW

3 / 6 mph 65 / 65°F 84% 1013 mb
Low level cloud: 2%
Mid level cloud: 19%
High level cloud: 87%
Most Significant Cloud Type: medium
26%
0.0 In
06:00

N
N

9 / 19 mph 53 / 50°F 75% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

SW
SW

9 / 19 mph 63 / 63°F 64% 1015 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
18:00

NNW
NNW

21 / 44 mph 60 / 60°F 69% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In

Other Locations Near to Porto

The day label given represents the local day relative to the local time for the location you are looking at.
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Day

This time is corrected for local time zones and where possible for daylight saving times.
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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.
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Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
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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.
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Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
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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.
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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.
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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.
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Pressure