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Wailuku 14 Day Long Range Forecast

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

Hawaii, United States Of America

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

The forecast for Wailuku in the coming two weeks is predicting the average daytime maximum temperature will be around 27°C, with a high for the two weeks of 29°C expected on the afternoon of Saturday 18th. The mean minimum temperature will be 23°C, dipping to its lowest on the morning of Saturday 25th at 22°C. The coming 14 days will have most days seeing a little rain. The indicators are that Wednesday 22nd will have the most precipitation with an accumulation of around 1.0mm. 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

7 / 8 mph 77 / 80°F 77% 1013 mb
Low level cloud: 14%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

SE
SE

4 / 5 mph 75 / 78°F 79% 1013 mb
Low level cloud: 8%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ENE
ENE

2 / 3 mph 80 / 80°F 76% 1015 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

NE
NE

4 / 4 mph 84 / 86°F 77% 1015 mb
Low level cloud: 1%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

E
E

7 / 8 mph 86 / 91°F 78% 1014 mb
Low level cloud: 28%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

ENE
ENE

9 / 10 mph 85 / 89°F 76% 1013 mb
Low level cloud: 1%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

E
E

9 / 10 mph 80 / 86°F 82% 1015 mb
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 33%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

ESE
ESE

6 / 7 mph 79 / 84°F 81% 1015 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 50%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
17:00

E
E

9 / 10 mph 81 / 87°F 78% 1016 mb
Low level cloud: 76%
Mid level cloud: 28%
High level cloud: 81%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

ENE
ENE

7 / 8 mph 79 / 84°F 81% 1018 mb
Low level cloud: 63%
Mid level cloud: 28%
High level cloud: 97%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

ENE
ENE

9 / 11 mph 77 / 81°F 82% 1019 mb
Low level cloud: 8%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
02:00

E
E

8 / 9 mph 74 / 78°F 80% 1017 mb
Low level cloud: 8%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

E
E

9 / 13 mph 73 / 77°F 79% 1017 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 73%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ENE
ENE

1 / 1 mph 78 / 78°F 76% 1019 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 26%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

E
E

8 / 9 mph 81 / 81°F 73% 1019 mb
Low level cloud: 8%
Mid level cloud: 43%
High level cloud: 77%
Most Significant Cloud Type: medium
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

ENE
ENE

10 / 12 mph 82 / 85°F 72% 1017 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

ENE
ENE

11 / 13 mph 82 / 84°F 75% 1016 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 80%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

ESE
ESE

6 / 7 mph 78 / 82°F 76% 1018 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 90%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

E
E

10 / 11 mph 76 / 79°F 76% 1018 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
02:00

E
E

7 / 9 mph 75 / 78°F 79% 1017 mb
Low level cloud: 2%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

ESE
ESE

6 / 8 mph 74 / 77°F 79% 1018 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

E
E

7 / 9 mph 77 / 78°F 73% 1019 mb
Low level cloud: 3%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

ENE
ENE

11 / 13 mph 80 / 81°F 70% 1018 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

ENE
ENE

10 / 12 mph 82 / 85°F 74% 1017 mb
Low level cloud: 2%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

ENE
ENE

10 / 12 mph 82 / 85°F 79% 1017 mb
Low level cloud: 53%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

ENE
ENE

11 / 13 mph 78 / 81°F 79% 1018 mb
Low level cloud: 75%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

ENE
ENE

11 / 12 mph 76 / 79°F 78% 1019 mb
Low level cloud: 60%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
02:00

ENE
ENE

11 / 13 mph 74 / 77°F 78% 1017 mb
Low level cloud: 45%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

ENE
ENE

12 / 16 mph 72 / 76°F 78% 1017 mb
Low level cloud: 14%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ENE
ENE

12 / 15 mph 75 / 77°F 73% 1018 mb
Low level cloud: 15%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

ENE
ENE

11 / 12 mph 79 / 80°F 71% 1018 mb
Low level cloud: 3%
Mid level cloud: 3%
High level cloud: 16%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

E
E

11 / 12 mph 82 / 83°F 71% 1016 mb
Low level cloud: 35%
Mid level cloud: 9%
High level cloud: 5%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

E
E

12 / 14 mph 81 / 83°F 75% 1015 mb
Low level cloud: 30%
Mid level cloud: 18%
High level cloud: 18%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

E
E

12 / 13 mph 77 / 80°F 79% 1017 mb
Low level cloud: 31%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

E
E

11 / 13 mph 75 / 79°F 81% 1018 mb
Low level cloud: 11%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
02:00

E
E

11 / 13 mph 75 / 78°F 81% 1017 mb
Low level cloud: 37%
Mid level cloud: 27%
High level cloud: 11%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

E
E

12 / 15 mph 74 / 77°F 81% 1017 mb
Low level cloud: 30%
Mid level cloud: 31%
High level cloud: 70%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

E
E

12 / 14 mph 77 / 78°F 76% 1018 mb
Low level cloud: 28%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

E
E

10 / 12 mph 80 / 81°F 70% 1018 mb
Low level cloud: 15%
Mid level cloud: 31%
High level cloud: 38%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

E
E

14 / 16 mph 81 / 83°F 73% 1017 mb
Low level cloud: 39%
Mid level cloud: 26%
High level cloud: 18%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

E
E

12 / 14 mph 81 / 83°F 76% 1016 mb
Low level cloud: 27%
Mid level cloud: 30%
High level cloud: 16%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

E
E

12 / 14 mph 79 / 81°F 80% 1019 mb
Low level cloud: 47%
Mid level cloud: 28%
High level cloud: 33%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

E
E

11 / 13 mph 76 / 79°F 79% 1019 mb
Low level cloud: 44%
Mid level cloud: 27%
High level cloud: 1%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
02:00

E
E

11 / 13 mph 74 / 78°F 79% 1018 mb
Low level cloud: 67%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

E
E

10 / 13 mph 73 / 77°F 79% 1018 mb
Low level cloud: 33%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ENE
ENE

11 / 14 mph 77 / 78°F 75% 1019 mb
Low level cloud: 57%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

ENE
ENE

10 / 12 mph 80 / 80°F 72% 1019 mb
Low level cloud: 35%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

ENE
ENE

10 / 12 mph 81 / 83°F 71% 1018 mb
Low level cloud: 22%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

E
E

12 / 14 mph 80 / 82°F 72% 1017 mb
Low level cloud: 13%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

ENE
ENE

12 / 14 mph 79 / 80°F 75% 1019 mb
Low level cloud: 12%
Mid level cloud: 11%
High level cloud: 7%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

ENE
ENE

12 / 14 mph 76 / 79°F 76% 1019 mb
Low level cloud: 9%
Mid level cloud: 6%
High level cloud: 21%
Most Significant Cloud Type: low
14%
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

E
E

10 / 20 mph 75 / 78°F 78% 1017 mb
Low level cloud: 27%
Mid level cloud: 27%
High level cloud: 32%
Most Significant Cloud Type: low
40%
0.0 In
08:00

E
E

3 / 6 mph 77 / 80°F 74% 1018 mb
Low level cloud: 27%
Mid level cloud: 8%
High level cloud: 7%
Most Significant Cloud Type: low
30%
0.0 In
14:00

ENE
ENE

12 / 24 mph 78 / 82°F 75% 1017 mb
Low level cloud: 28%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
36%
0.0 In
20:00

ENE
ENE

12 / 25 mph 76 / 79°F 76% 1018 mb
Low level cloud: 38%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.0 In
Sat 25
May
02:00

E
E

10 / 18 mph 73 / 77°F 71% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
08:00

ENE
ENE

7 / 12 mph 73 / 77°F 68% 1018 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 17%
Most Significant Cloud Type: medium
6%
0.0 In
14:00

ENE
ENE

11 / 22 mph 79 / 83°F 70% 1017 mb
Low level cloud: 36%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
20:00

ENE
ENE

13 / 23 mph 76 / 79°F 73% 1018 mb
Low level cloud: 9%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
Sun 26
May
02:00

ENE
ENE

11 / 22 mph 74 / 77°F 77% 1017 mb
Low level cloud: 27%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: low
29%
0.0 In
08:00

ENE
ENE

11 / 21 mph 74 / 77°F 68% 1019 mb
Low level cloud: 4%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
5%
0.0 In
14:00

ENE
ENE

14 / 27 mph 79 / 82°F 68% 1017 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
20:00

ENE
ENE

14 / 26 mph 77 / 81°F 77% 1019 mb
Low level cloud: 37%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
Mon 27
May
02:00

ENE
ENE

12 / 23 mph 74 / 78°F 79% 1018 mb
Low level cloud: 46%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.0 In
08:00

ENE
ENE

15 / 30 mph 74 / 77°F 73% 1020 mb
Low level cloud: 25%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.0 In
14:00

ENE
ENE

15 / 29 mph 79 / 83°F 75% 1019 mb
Low level cloud: 61%
Mid level cloud: 47%
High level cloud: 32%
Most Significant Cloud Type: low
81%
0.0 In
20:00

ENE
ENE

15 / 30 mph 77 / 80°F 78% 1020 mb
Low level cloud: 46%
Mid level cloud: 29%
High level cloud: 4%
Most Significant Cloud Type: low
56%
0.0 In
Tue 28
May
02:00

ENE
ENE

13 / 26 mph 74 / 78°F 79% 1018 mb
Low level cloud: 41%
Mid level cloud: 10%
High level cloud: 5%
Most Significant Cloud Type: low
45%
0.0 In
08:00

ENE
ENE

15 / 30 mph 74 / 77°F 73% 1020 mb
Low level cloud: 29%
Mid level cloud: 12%
High level cloud: 2%
Most Significant Cloud Type: low
33%
0.0 In
14:00

ENE
ENE

15 / 30 mph 81 / 85°F 67% 1017 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
20:00

ENE
ENE

14 / 29 mph 77 / 80°F 78% 1019 mb
Low level cloud: 34%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: low
52%
0.0 In
Wed 29
May
02:00

ENE
ENE

13 / 28 mph 75 / 78°F 75% 1018 mb
Low level cloud: 13%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.0 In
08:00

ENE
ENE

15 / 31 mph 74 / 78°F 71% 1019 mb
Low level cloud: 14%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: medium
82%
0.0 In
14:00

E
E

14 / 29 mph 81 / 85°F 69% 1017 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
20:00

ENE
ENE

15 / 31 mph 77 / 81°F 76% 1019 mb
Low level cloud: 3%
Mid level cloud: 45%
High level cloud: 12%
Most Significant Cloud Type: medium
53%
0.0 In
Thu 30
May
02:00

ENE
ENE

10 / 21 mph 75 / 78°F 76% 1018 mb
Low level cloud: 12%
Mid level cloud: 3%
High level cloud: 32%
Most Significant Cloud Type: low
16%
0.0 In
08:00

ENE
ENE

13 / 27 mph 74 / 78°F 73% 1019 mb
Low level cloud: 6%
Mid level cloud: 30%
High level cloud: 32%
Most Significant Cloud Type: medium
47%
0.0 In
14:00

ENE
ENE

13 / 28 mph 81 / 84°F 67% 1017 mb
Low level cloud: 6%
Mid level cloud: 4%
High level cloud: 74%
Most Significant Cloud Type: medium
24%
0.0 In
20:00

ENE
ENE

18 / 38 mph 78 / 81°F 77% 1019 mb
Low level cloud: 28%
Mid level cloud: 19%
High level cloud: 2%
Most Significant Cloud Type: low
35%
0.0 In
Fri 31
May
02:00

ENE
ENE

11 / 24 mph 75 / 78°F 76% 1018 mb
Low level cloud: 11%
Mid level cloud: 26%
High level cloud: 32%
Most Significant Cloud Type: low
23%
0.0 In
08:00

ENE
ENE

13 / 27 mph 74 / 78°F 74% 1020 mb
Low level cloud: 17%
Mid level cloud: 22%
High level cloud: 7%
Most Significant Cloud Type: low
25%
0.0 In
14:00

E
E

12 / 25 mph 79 / 83°F 73% 1018 mb
Low level cloud: 32%
Mid level cloud: 14%
High level cloud: 59%
Most Significant Cloud Type: low
43%
0.0 In
20:00

ENE
ENE

15 / 32 mph 77 / 80°F 77% 1020 mb
Low level cloud: 10%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.0 In
Sat 01
Jun
02:00

ENE
ENE

12 / 25 mph 75 / 78°F 78% 1017 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 14%
Most Significant Cloud Type: medium
25%
0.0 In
08:00

ENE
ENE

16 / 33 mph 75 / 78°F 72% 1020 mb
Low level cloud: 19%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
24%
0.0 In
14:00

ENE
ENE

12 / 26 mph 80 / 83°F 70% 1017 mb
Low level cloud: 45%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.0 In
20:00

ENE
ENE

13 / 27 mph 78 / 82°F 75% 1020 mb
Low level cloud: 4%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In

Other Locations Near to Wailuku

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