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Waimanalo 14 Day Long Range Forecast

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

Hawaii, United States Of America

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

For Waimanalo in the coming two weeks the average daytime maximum temperature will be around 28°C, with a high for the two weeks of 29°C expected on the afternoon of Sunday 19th. The average minimum temperature will be 23°C, dipping to its lowest on the morning of Sunday 19th at 23°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. The indicators are that Saturday 18th will have the most precipitation with an accumulation of around 10.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
May		02:00

S
S

 9 / 11 mph 77 / 81°F 83% 1012 mb
Low level cloud: 62%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

S
S

 8 / 12 mph 75 / 79°F 83% 1012 mb
Low level cloud: 47%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

S
S

 8 / 11 mph 80 / 80°F 80% 1014 mb
Low level cloud: 44%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

S
S

 10 / 12 mph 83 / 86°F 77% 1014 mb
Low level cloud: 36%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

S
S

 12 / 15 mph 84 / 90°F 77% 1014 mb
Low level cloud: 14%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

SSE
SSE

 9 / 10 mph 85 / 89°F 79% 1013 mb
Low level cloud: 17%
Mid level cloud: 10%
High level cloud: 9%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

ESE
ESE

 7 / 8 mph 83 / 87°F 83% 1015 mb
Low level cloud: 47%
Mid level cloud: 11%
High level cloud: 97%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

ENE
ENE

 9 / 10 mph 79 / 85°F 87% 1016 mb
Low level cloud: 22%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		20:00

NNE
NNE

 11 / 17 mph 80 / 83°F 89% 1018 mb
Low level cloud: 34%
Mid level cloud: 45%
High level cloud: 82%
Most Significant Cloud Type: low
59%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
23:00

NNE
NNE

 8 / 10 mph 76 / 80°F 86% 1019 mb
Low level cloud: 40%
Mid level cloud: 44%
High level cloud: 98%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		02:00

ENE
ENE

 9 / 10 mph 75 / 79°F 84% 1018 mb
Low level cloud: 38%
Mid level cloud: 45%
High level cloud: 99%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

ENE
ENE

 6 / 9 mph 74 / 78°F 83% 1017 mb
Low level cloud: 6%
Mid level cloud: 43%
High level cloud: 62%
Most Significant Cloud Type: medium
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

E
E

 10 / 13 mph 77 / 78°F 80% 1019 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 99%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

ESE
ESE

 12 / 14 mph 80 / 82°F 79% 1018 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 79%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

ESE
ESE

 8 / 10 mph 84 / 85°F 75% 1017 mb
Low level cloud: 7%
Mid level cloud: 31%
High level cloud: 99%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

ENE
ENE

 6 / 7 mph 83 / 85°F 74% 1017 mb
Low level cloud: 1%
Mid level cloud: 72%
High level cloud: 80%
Most Significant Cloud Type: medium
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

ENE
ENE

 10 / 12 mph 80 / 82°F 75% 1018 mb
Low level cloud: 21%
Mid level cloud: 55%
High level cloud: 98%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

ENE
ENE

 13 / 15 mph 76 / 79°F 77% 1019 mb
Low level cloud: 3%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		02:00

ESE
ESE

 9 / 11 mph 76 / 79°F 76% 1017 mb
Low level cloud: 35%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

E
E

 8 / 11 mph 75 / 78°F 74% 1018 mb
Low level cloud: 73%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ENE
ENE

 11 / 13 mph 78 / 79°F 75% 1019 mb
Low level cloud: 53%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

ENE
ENE

 15 / 17 mph 80 / 83°F 77% 1019 mb
Low level cloud: 27%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

ENE
ENE

 14 / 16 mph 82 / 86°F 77% 1018 mb
Low level cloud: 33%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

ENE
ENE

 14 / 17 mph 82 / 85°F 79% 1017 mb
Low level cloud: 63%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

ENE
ENE

 15 / 18 mph 80 / 82°F 80% 1019 mb
Low level cloud: 60%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

ENE
ENE

 15 / 17 mph 77 / 80°F 78% 1020 mb
Low level cloud: 82%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		02:00

ENE
ENE

 16 / 19 mph 75 / 78°F 77% 1018 mb
Low level cloud: 85%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

ENE
ENE

 18 / 24 mph 74 / 78°F 76% 1017 mb
Low level cloud: 85%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

E
E

 16 / 19 mph 77 / 79°F 75% 1018 mb
Low level cloud: 64%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

E
E

 18 / 21 mph 79 / 82°F 76% 1019 mb
Low level cloud: 49%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

ENE
ENE

 17 / 19 mph 81 / 84°F 77% 1017 mb
Low level cloud: 35%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

ENE
ENE

 18 / 21 mph 81 / 84°F 80% 1016 mb
Low level cloud: 40%
Mid level cloud: 3%
High level cloud: 10%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

ENE
ENE

 19 / 22 mph 79 / 82°F 82% 1017 mb
Low level cloud: 51%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

ENE
ENE

 18 / 21 mph 76 / 80°F 83% 1018 mb
Low level cloud: 68%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		02:00

E
E

 17 / 21 mph 75 / 79°F 82% 1017 mb
Low level cloud: 77%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

E
E

 18 / 23 mph 74 / 78°F 82% 1017 mb
Low level cloud: 85%
Mid level cloud: 14%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

E
E

 18 / 22 mph 76 / 79°F 79% 1018 mb
Low level cloud: 80%
Mid level cloud: 15%
High level cloud: 22%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

E
E

 16 / 19 mph 79 / 81°F 77% 1019 mb
Low level cloud: 56%
Mid level cloud: 13%
High level cloud: 42%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

E
E

 14 / 17 mph 81 / 83°F 78% 1018 mb
Low level cloud: 40%
Mid level cloud: 18%
High level cloud: 37%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

ENE
ENE

 14 / 17 mph 80 / 83°F 79% 1017 mb
Low level cloud: 47%
Mid level cloud: 20%
High level cloud: 80%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

ENE
ENE

 20 / 23 mph 79 / 81°F 81% 1019 mb
Low level cloud: 46%
Mid level cloud: 18%
High level cloud: 10%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

E
E

 17 / 20 mph 76 / 80°F 80% 1020 mb
Low level cloud: 49%
Mid level cloud: 14%
High level cloud: 4%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		02:00

E
E

 17 / 20 mph 76 / 79°F 79% 1018 mb
Low level cloud: 64%
Mid level cloud: 11%
High level cloud: 6%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

ENE
ENE

 19 / 26 mph 74 / 78°F 79% 1018 mb
Low level cloud: 57%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

E
E

 20 / 23 mph 77 / 79°F 79% 1019 mb
Low level cloud: 43%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

ENE
ENE

 19 / 22 mph 80 / 83°F 77% 1019 mb
Low level cloud: 26%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

ENE
ENE

 21 / 24 mph 82 / 85°F 76% 1018 mb
Low level cloud: 21%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

ENE
ENE

 23 / 26 mph 81 / 85°F 80% 1018 mb
Low level cloud: 27%
Mid level cloud: 12%
High level cloud: 94%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

ENE
ENE

 23 / 26 mph 79 / 82°F 80% 1019 mb
Low level cloud: 24%
Mid level cloud: 12%
High level cloud: 62%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

ENE
ENE

 21 / 24 mph 77 / 80°F 77% 1020 mb
Low level cloud: 62%
Mid level cloud: 12%
High level cloud: 36%
Most Significant Cloud Type: low
70%
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		02:00

ENE
ENE

 17 / 35 mph 76 / 79°F 77% 1017 mb
Low level cloud: 71%
Mid level cloud: 18%
High level cloud: 20%
Most Significant Cloud Type: low
79%
0.0 In
08:00

ENE
ENE

 9 / 18 mph 77 / 80°F 77% 1018 mb
Low level cloud: 52%
Mid level cloud: 6%
High level cloud: 13%
Most Significant Cloud Type: low
55%
0.0 In
14:00

ENE
ENE

 21 / 45 mph 79 / 82°F 74% 1017 mb
Low level cloud: 58%
Mid level cloud: 23%
High level cloud: 1%
Most Significant Cloud Type: low
66%
0.0 In
20:00

ENE
ENE

 22 / 47 mph 78 / 81°F 77% 1018 mb
Low level cloud: 79%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
80%
0.0 In
Sat 25
May		02:00

E
E

 16 / 34 mph 75 / 78°F 71% 1018 mb
Low level cloud: 39%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.0 In
08:00

ENE
ENE

 15 / 31 mph 75 / 78°F 74% 1018 mb
Low level cloud: 46%
Mid level cloud: 20%
High level cloud: 42%
Most Significant Cloud Type: low
58%
0.0 In
14:00

ENE
ENE

 21 / 43 mph 81 / 85°F 73% 1017 mb
Low level cloud: 55%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
54%
0.0 In
20:00

ENE
ENE

 21 / 45 mph 77 / 80°F 74% 1018 mb
Low level cloud: 59%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
60%
0.0 In
Sun 26
May		02:00

ENE
ENE

 19 / 40 mph 75 / 78°F 76% 1017 mb
Low level cloud: 62%
Mid level cloud: 5%
High level cloud: 6%
Most Significant Cloud Type: low
64%
0.0 In
08:00

E
E

 20 / 43 mph 76 / 79°F 75% 1019 mb
Low level cloud: 52%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.0 In
14:00

ENE
ENE

 20 / 42 mph 79 / 83°F 74% 1018 mb
Low level cloud: 59%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
60%
0.0 In
20:00

ENE
ENE

 23 / 49 mph 78 / 82°F 80% 1020 mb
Low level cloud: 58%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
60%
0.0 In
Mon 27
May		02:00

ENE
ENE

 21 / 44 mph 75 / 78°F 75% 1017 mb
Low level cloud: 50%
Mid level cloud: 7%
High level cloud: 12%
Most Significant Cloud Type: low
54%
0.0 In
08:00

ENE
ENE

 26 / 54 mph 75 / 79°F 78% 1020 mb
Low level cloud: 47%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.1 In
14:00

ENE
ENE

 23 / 48 mph 78 / 81°F 74% 1018 mb
Low level cloud: 32%
Mid level cloud: 45%
High level cloud: 93%
Most Significant Cloud Type: low
59%
0.0 In
20:00

ENE
ENE

 26 / 53 mph 77 / 81°F 80% 1020 mb
Low level cloud: 67%
Mid level cloud: 20%
High level cloud: 2%
Most Significant Cloud Type: low
74%
0.0 In
Tue 28
May		02:00

ENE
ENE

 21 / 45 mph 75 / 78°F 78% 1017 mb
Low level cloud: 51%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
78%
0.0 In
08:00

ENE
ENE

 25 / 52 mph 76 / 79°F 76% 1020 mb
Low level cloud: 47%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: low
48%
0.0 In
14:00

ENE
ENE

 21 / 44 mph 77 / 81°F 76% 1018 mb
Low level cloud: 25%
Mid level cloud: 44%
High level cloud: 38%
Most Significant Cloud Type: low
44%
0.0 In
20:00

ENE
ENE

 24 / 51 mph 78 / 82°F 77% 1020 mb
Low level cloud: 60%
Mid level cloud: 16%
High level cloud: 64%
Most Significant Cloud Type: low
73%
0.0 In
Wed 29
May		02:00

ENE
ENE

 21 / 43 mph 75 / 79°F 81% 1018 mb
Low level cloud: 67%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.0 In
08:00

ENE
ENE

 24 / 50 mph 75 / 79°F 77% 1019 mb
Low level cloud: 69%
Mid level cloud: 29%
High level cloud: 8%
Most Significant Cloud Type: low
80%
0.0 In
14:00

ENE
ENE

 22 / 46 mph 79 / 83°F 77% 1018 mb
Low level cloud: 22%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: low
23%
0.0 In
20:00

ENE
ENE

 26 / 55 mph 77 / 82°F 82% 1019 mb
Low level cloud: 64%
Mid level cloud: 50%
High level cloud: 37%
Most Significant Cloud Type: low
86%
0.0 In
Thu 30
May		02:00

ENE
ENE

 20 / 42 mph 76 / 79°F 82% 1019 mb
Low level cloud: 79%
Mid level cloud: 22%
High level cloud: 1%
Most Significant Cloud Type: low
87%
0.0 In
08:00

ENE
ENE

 26 / 54 mph 75 / 79°F 82% 1019 mb
Low level cloud: 65%
Mid level cloud: 72%
High level cloud: 33%
Most Significant Cloud Type: low
94%
0.1 In
14:00

ENE
ENE

 23 / 49 mph 80 / 85°F 80% 1019 mb
Low level cloud: 48%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
20:00

ENE
ENE

 26 / 55 mph 77 / 81°F 83% 1019 mb
Low level cloud: 55%
Mid level cloud: 58%
High level cloud: 4%
Most Significant Cloud Type: low
75%
0.0 In
Fri 31
May		02:00

ENE
ENE

 22 / 47 mph 76 / 79°F 81% 1019 mb
Low level cloud: 60%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.0 In
08:00

ENE
ENE

 23 / 48 mph 75 / 79°F 81% 1020 mb
Low level cloud: 56%
Mid level cloud: 21%
High level cloud: 94%
Most Significant Cloud Type: low
74%
0.0 In
14:00

ENE
ENE

 24 / 50 mph 79 / 83°F 77% 1020 mb
Low level cloud: 22%
Mid level cloud: 4%
High level cloud: 1%
Most Significant Cloud Type: low
23%
0.0 In
20:00

ENE
ENE

 27 / 57 mph 77 / 81°F 83% 1021 mb
Low level cloud: 50%
Mid level cloud: 44%
High level cloud: 15%
Most Significant Cloud Type: low
66%
0.0 In
Sat 01
Jun		02:00

ENE
ENE

 19 / 40 mph 76 / 80°F 81% 1020 mb
Low level cloud: 52%
Mid level cloud: 11%
High level cloud: 3%
Most Significant Cloud Type: low
56%
0.0 In
08:00

ENE
ENE

 27 / 57 mph 76 / 79°F 79% 1021 mb
Low level cloud: 30%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.0 In
14:00

ENE
ENE

 24 / 50 mph 81 / 87°F 78% 1020 mb
Low level cloud: 40%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.0 In
20:00

ENE
ENE

 23 / 49 mph 78 / 82°F 79% 1021 mb
Low level cloud: 48%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
51%
0.0 In

Other Locations Near to Waimanalo

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.
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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