Fast Forecast

WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Viet Tri 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Viet Tri

Vietnam

Long range weather outlook for Viet Tri includes 14 day forecast summary:

The forecast for Viet Tri in the coming two weeks is predicting the average daytime maximum temperature will be around 34°C, with a high for the two weeks of 38°C expected on the afternoon of Monday 27th. The mean minimum temperature will be 26°C, dipping to its lowest on the morning of Tuesday 21st at 24°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. The indicators are that Monday 20th will have the most precipitation with an accumulation of around 18.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityCloud AmountPrecip AmountWeather
Sun 19
May		07:00

E
E

 4 / 5 mph 83 / 89°F 93%
Low level cloud: 80%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

E
E

 6 / 6 mph 88 / 101°F 75%
Low level cloud: 86%
Mid level cloud: 17%
High level cloud: 1%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 7 / 9 mph 93 / 106°F 66%
Low level cloud: 50%
Mid level cloud: 23%
High level cloud: 32%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ENE
ENE

 9 / 11 mph 93 / 107°F 62%
Low level cloud: 65%
Mid level cloud: 40%
High level cloud: 14%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

 4 / 8 mph 80 / 88°F 88%
Low level cloud: 7%
Mid level cloud: 26%
High level cloud: 17%
Most Significant Cloud Type: medium
46%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
22:00

S
S

 4 / 8 mph 79 / 85°F 92%
Low level cloud: 26%
Mid level cloud: 48%
High level cloud: 36%
Most Significant Cloud Type: low
46%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
Mon 20
May		01:00

SE
SE

 5 / 8 mph 78 / 83°F 93%
Low level cloud: 26%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: low
41%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

SSE
SSE

 3 / 5 mph 77 / 83°F 94%
Low level cloud: 50%
Mid level cloud: 44%
High level cloud: 16%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ESE
ESE

 3 / 4 mph 83 / 86°F 85%
Low level cloud: 23%
Mid level cloud: 46%
High level cloud: 14%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ENE
ENE

 3 / 5 mph 89 / 95°F 66%
Low level cloud: 54%
Mid level cloud: 44%
High level cloud: 11%
Most Significant Cloud Type: low
71%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

N
N

 6 / 12 mph 90 / 97°F 68%
Low level cloud: 54%
Mid level cloud: 46%
High level cloud: 13%
Most Significant Cloud Type: low
71%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
16:00

NW
NW

 4 / 9 mph 88 / 95°F 72%
Low level cloud: 11%
Mid level cloud: 44%
High level cloud: 21%
Most Significant Cloud Type: medium
76%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
19:00

NW
NW

 5 / 9 mph 79 / 85°F 87%
Low level cloud: 11%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: medium
78%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

WNW
WNW

 5 / 9 mph 78 / 83°F 89%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 39%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		01:00

WNW
WNW

 4 / 6 mph 77 / 81°F 90%
Low level cloud: 1%
Mid level cloud: 31%
High level cloud: 32%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 3 / 5 mph 76 / 80°F 90%
Low level cloud: 4%
Mid level cloud: 39%
High level cloud: 99%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 4 / 6 mph 82 / 83°F 84%
Low level cloud: 6%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 6 / 6 mph 90 / 94°F 61%
Low level cloud: 1%
Mid level cloud: 37%
High level cloud: 32%
Most Significant Cloud Type: medium
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 3 / 4 mph 96 / 100°F 46%
Low level cloud: 9%
Mid level cloud: 29%
High level cloud: 10%
Most Significant Cloud Type: medium
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 2 / 3 mph 96 / 102°F 52%
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 21%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

 5 / 9 mph 82 / 89°F 75%
Low level cloud: 10%
Mid level cloud: 44%
High level cloud: 14%
Most Significant Cloud Type: medium
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 6 / 11 mph 79 / 85°F 86%
Low level cloud: 10%
Mid level cloud: 45%
High level cloud: 33%
Most Significant Cloud Type: medium
75%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 22
May		01:00

SE
SE

 4 / 7 mph 78 / 84°F 89%
Low level cloud: 2%
Mid level cloud: 43%
High level cloud: 79%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

E
E

 2 / 3 mph 78 / 83°F 89%
Low level cloud: 7%
Mid level cloud: 43%
High level cloud: 19%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

 1 / 2 mph 81 / 81°F 87%
Low level cloud: 5%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: medium
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 3 / 5 mph 80 / 85°F 83%
Low level cloud: 4%
Mid level cloud: 85%
High level cloud: 32%
Most Significant Cloud Type: medium
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 4 / 4 mph 85 / 88°F 81%
Low level cloud: 2%
Mid level cloud: 46%
High level cloud: 7%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 3 / 3 mph 85 / 89°F 80%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 8%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

 2 / 3 mph 82 / 89°F 82%
Low level cloud: 12%
Mid level cloud: 27%
High level cloud: 33%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 3 / 4 mph 80 / 88°F 89%
Low level cloud: 21%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
40%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Thu 23
May		01:00

SE
SE

 2 / 4 mph 78 / 83°F 91%
Low level cloud: 34%
Mid level cloud: 45%
High level cloud: 35%
Most Significant Cloud Type: low
53%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

SW
SW

 1 / 2 mph 76 / 81°F 92%
Low level cloud: 53%
Mid level cloud: 46%
High level cloud: 34%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 3 / 5 mph 78 / 81°F 90%
Low level cloud: 61%
Mid level cloud: 44%
High level cloud: 98%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 3 / 5 mph 84 / 87°F 82%
Low level cloud: 21%
Mid level cloud: 44%
High level cloud: 63%
Most Significant Cloud Type: low
44%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

NNE
NNE

 4 / 5 mph 85 / 90°F 74%
Low level cloud: 7%
Mid level cloud: 61%
High level cloud: 18%
Most Significant Cloud Type: medium
79%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

ESE
ESE

 6 / 7 mph 89 / 93°F 66%
Low level cloud: 45%
Mid level cloud: 41%
High level cloud: 29%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 4 / 7 mph 80 / 86°F 83%
Low level cloud: 5%
Mid level cloud: 46%
High level cloud: 55%
Most Significant Cloud Type: medium
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 3 / 4 mph 78 / 83°F 84%
Low level cloud: 2%
Mid level cloud: 30%
High level cloud: 22%
Most Significant Cloud Type: medium
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May		01:00

ESE
ESE

 1 / 2 mph 78 / 83°F 88%
Low level cloud: 22%
Mid level cloud: 28%
High level cloud: 35%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 1 / 1 mph 76 / 80°F 90%
Low level cloud: 31%
Mid level cloud: 32%
High level cloud: 33%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 2 / 2 mph 83 / 84°F 83%
Low level cloud: 46%
Mid level cloud: 32%
High level cloud: 10%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ENE
ENE

 1 / 1 mph 90 / 97°F 63%
Low level cloud: 72%
Mid level cloud: 25%
High level cloud: 2%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

 4 / 5 mph 91 / 99°F 56%
Low level cloud: 92%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 7 / 9 mph 92 / 100°F 63%
Low level cloud: 51%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 9 / 15 mph 81 / 88°F 86%
Low level cloud: 11%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
61%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

ESE
ESE

 7 / 10 mph 79 / 87°F 92%
Low level cloud: 23%
Mid level cloud: 42%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
May		01:00

E
E

 5 / 7 mph 78 / 85°F 95%
Low level cloud: 55%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

 3 / 5 mph 77 / 83°F 97%
Low level cloud: 80%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 4 / 4 mph 82 / 86°F 89%
Low level cloud: 70%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 3 / 3 mph 88 / 97°F 70%
Low level cloud: 76%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 4 / 5 mph 93 / 105°F 58%
Low level cloud: 78%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 6 / 7 mph 94 / 106°F 61%
Low level cloud: 72%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

 9 / 14 mph 85 / 95°F 78%
Low level cloud: 40%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

 8 / 11 mph 80 / 88°F 93%
Low level cloud: 30%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
39%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityCloud AmountPrecip AmountWeather
Sun 26
May		01:00

E
E

 3 / 7 mph 82 / 94°F 93%
Low level cloud: 36%
Mid level cloud: 18%
High level cloud: 54%
Most Significant Cloud Type: low
49%
0.0 In
07:00

E
E

 4 / 9 mph 81 / 91°F 91%
Low level cloud: 86%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
13:00

ESE
ESE

 4 / 8 mph 93 / 113°F 67%
Low level cloud: 37%
Mid level cloud: 16%
High level cloud: 67%
Most Significant Cloud Type: low
50%
0.0 In
19:00

ESE
ESE

 10 / 21 mph 86 / 100°F 81%
Low level cloud: 8%
Mid level cloud: 24%
High level cloud: 8%
Most Significant Cloud Type: low
17%
0.0 In
Mon 27
May		01:00

E
E

 5 / 11 mph 84 / 97°F 92%
Low level cloud: 46%
Mid level cloud: 12%
High level cloud: 33%
Most Significant Cloud Type: low
53%
0.0 In
07:00

ESE
ESE

 1 / 2 mph 85 / 100°F 90%
Low level cloud: 86%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
88%
0.0 In
13:00

SSE
SSE

 2 / 4 mph 99 / 122°F 57%
Low level cloud: 40%
Mid level cloud: 8%
High level cloud: 10%
Most Significant Cloud Type: low
44%
0.0 In
19:00

SE
SE

 11 / 23 mph 91 / 105°F 66%
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
Tue 28
May		01:00

E
E

 6 / 12 mph 85 / 98°F 83%
Low level cloud: 3%
Mid level cloud: 99%
High level cloud: 9%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

E
E

 1 / 2 mph 87 / 105°F 87%
Low level cloud: 27%
Mid level cloud: 50%
High level cloud: 15%
Most Significant Cloud Type: low
46%
0.0 In
13:00

NNE
NNE

 4 / 9 mph 98 / 119°F 57%
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 33%
Most Significant Cloud Type: medium
44%
0.0 In
19:00

E
E

 6 / 12 mph 93 / 114°F 69%
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 63%
Most Significant Cloud Type: medium
27%
0.0 In
Wed 29
May		01:00

NE
NE

 4 / 8 mph 87 / 107°F 90%
Low level cloud: 13%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
84%
0.2 In
07:00

E
E

 2 / 4 mph 86 / 103°F 86%
Low level cloud: 43%
Mid level cloud: 27%
High level cloud: 94%
Most Significant Cloud Type: low
63%
0.0 In
13:00

NE
NE

 2 / 4 mph 93 / 113°F 70%
Low level cloud: 0%
Mid level cloud: 33%
High level cloud: 58%
Most Significant Cloud Type: medium
36%
0.1 In
19:00

E
E

 4 / 8 mph 90 / 111°F 80%
Low level cloud: 0%
Mid level cloud: 58%
High level cloud: 65%
Most Significant Cloud Type: medium
61%
0.2 In
Thu 30
May		01:00

ESE
ESE

 3 / 6 mph 85 / 105°F 96%
Low level cloud: 59%
Mid level cloud: 81%
High level cloud: 32%
Most Significant Cloud Type: low
91%
0.4 In
07:00

E
E

 2 / 5 mph 86 / 101°F 86%
Low level cloud: 52%
Mid level cloud: 60%
High level cloud: 100%
Most Significant Cloud Type: low
84%
0.1 In
13:00

WNW
WNW

 4 / 9 mph 90 / 113°F 85%
Low level cloud: 24%
Mid level cloud: 45%
High level cloud: 51%
Most Significant Cloud Type: low
45%
0.3 In
19:00

N
N

 3 / 6 mph 89 / 109°F 85%
Low level cloud: 1%
Mid level cloud: 48%
High level cloud: 31%
Most Significant Cloud Type: medium
51%
0.0 In
Fri 31
May		01:00

N
N

 1 / 2 mph 83 / 95°F 93%
Low level cloud: 75%
Mid level cloud: 85%
High level cloud: 30%
Most Significant Cloud Type: low
100%
0.2 In
07:00

E
E

 6 / 13 mph 74 / 78°F 94%
Low level cloud: 96%
Mid level cloud: 64%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.7 In
13:00

SE
SE

 4 / 8 mph 85 / 97°F 82%
Low level cloud: 77%
Mid level cloud: 69%
High level cloud: 12%
Most Significant Cloud Type: low
100%
0.1 In
19:00

N
N

 1 / 2 mph 80 / 89°F 93%
Low level cloud: 98%
Mid level cloud: 74%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.6 In
Sat 01
Jun		01:00

E
E

 3 / 6 mph 83 / 98°F 94%
Low level cloud: 63%
Mid level cloud: 56%
High level cloud: 41%
Most Significant Cloud Type: low
87%
0.1 In
07:00

E
E

 2 / 4 mph 72 / 77°F 97%
Low level cloud: 99%
Mid level cloud: 74%
High level cloud: 35%
Most Significant Cloud Type: low
100%
0.6 In
13:00

SW
SW

 3 / 6 mph 87 / 102°F 78%
Low level cloud: 8%
Mid level cloud: 43%
High level cloud: 11%
Most Significant Cloud Type: medium
65%
0.0 In
19:00

S
S

 2 / 4 mph 75 / 79°F 93%
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.2 In
Sun 02
Jun		01:00

E
E

 5 / 10 mph 84 / 98°F 92%
Low level cloud: 41%
Mid level cloud: 26%
High level cloud: 13%
Most Significant Cloud Type: low
51%
0.0 In
07:00

WNW
WNW

 1 / 2 mph 73 / 77°F 91%
Low level cloud: 100%
Mid level cloud: 46%
High level cloud: 41%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SSW
SSW

 5 / 10 mph 93 / 112°F 66%
Low level cloud: 3%
Mid level cloud: 39%
High level cloud: 10%
Most Significant Cloud Type: medium
46%
0.1 In
19:00

ESE
ESE

 1 / 2 mph 77 / 81°F 89%
Low level cloud: 96%
Mid level cloud: 44%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.0 In
Mon 03
Jun		01:00

E
E

 9 / 19 mph 84 / 97°F 91%
Low level cloud: 14%
Mid level cloud: 54%
High level cloud: 32%
Most Significant Cloud Type: medium
94%
0.4 In
07:00

NNE
NNE

 2 / 5 mph 72 / 77°F 93%
Low level cloud: 95%
Mid level cloud: 44%
High level cloud: 84%
Most Significant Cloud Type: low
100%
0.1 In
13:00

E
E

 5 / 11 mph 89 / 105°F 74%
Low level cloud: 63%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: low
79%
0.1 In
19:00

WNW
WNW

 1 / 2 mph 77 / 83°F 90%
Low level cloud: 82%
Mid level cloud: 69%
High level cloud: 21%
Most Significant Cloud Type: low
100%
0.0 In

Other Locations Near to Viet Tri

Cities and Towns: Hanoi, Vietnam

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