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Hong Kong 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Hong Kong

China

Long range weather outlook for Hong Kong includes 14 day forecast summary:

The forecast for Hong Kong in the coming two weeks is predicting the average daytime maximum temperature will be around 23°C, with a high for the two weeks of 26°C expected on the afternoon of Sunday 21st. The average minimum temperature will be 18°C, dipping to its lowest on the morning of Thursday 25th at 16°C. Expect the next 14 days remain predominantly dry. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 17
Dec		17:00

E
E

 5 / 6 mph 79 / 79°F 58% 1018 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
20:00

E
E

 7 / 8 mph 76 / 79°F 67% 1020 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

ENE
ENE

 9 / 10 mph 73 / 77°F 72% 1020 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 18
Dec		02:00

ENE
ENE

 12 / 16 mph 68 / 68°F 74% 1020 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

ENE
ENE

 15 / 19 mph 66 / 66°F 78% 1020 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ENE
ENE

 13 / 16 mph 67 / 67°F 73% 1021 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

ENE
ENE

 12 / 14 mph 72 / 71°F 61% 1022 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

E
E

 10 / 12 mph 75 / 77°F 59% 1018 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

E
E

 11 / 12 mph 75 / 77°F 67% 1017 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

E
E

 11 / 13 mph 71 / 71°F 78% 1019 mb
Low level cloud: 11%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

E
E

 11 / 13 mph 69 / 69°F 81% 1018 mb
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
Fri 19
Dec		02:00

ENE
ENE

 11 / 13 mph 68 / 67°F 83% 1017 mb
Low level cloud: 95%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

ENE
ENE

 10 / 12 mph 66 / 66°F 84% 1017 mb
Low level cloud: 47%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ENE
ENE

 8 / 9 mph 68 / 67°F 80% 1018 mb
Low level cloud: 67%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

ENE
ENE

 8 / 9 mph 73 / 76°F 68% 1018 mb
Low level cloud: 11%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

E
E

 9 / 10 mph 75 / 77°F 65% 1015 mb
Low level cloud: 12%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

E
E

 9 / 10 mph 75 / 77°F 71% 1014 mb
Low level cloud: 35%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

ENE
ENE

 10 / 11 mph 72 / 76°F 81% 1016 mb
Low level cloud: 38%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

ENE
ENE

 11 / 13 mph 70 / 70°F 87% 1016 mb
Low level cloud: 30%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 20
Dec		02:00

ENE
ENE

 12 / 14 mph 69 / 69°F 89% 1016 mb
Low level cloud: 27%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

ENE
ENE

 12 / 15 mph 68 / 68°F 86% 1015 mb
Low level cloud: 26%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ENE
ENE

 10 / 14 mph 70 / 69°F 79% 1017 mb
Low level cloud: 32%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

ENE
ENE

 8 / 9 mph 75 / 77°F 71% 1017 mb
Low level cloud: 35%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

ESE
ESE

 8 / 9 mph 78 / 79°F 67% 1014 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

ESE
ESE

 6 / 7 mph 78 / 79°F 72% 1015 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

E
E

 7 / 8 mph 75 / 79°F 80% 1017 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

ENE
ENE

 8 / 9 mph 73 / 77°F 84% 1017 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
Sun 21
Dec		02:00

ENE
ENE

 8 / 10 mph 71 / 71°F 83% 1016 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

NE
NE

 8 / 12 mph 69 / 69°F 81% 1016 mb
Low level cloud: 3%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

NE
NE

 6 / 9 mph 71 / 69°F 75% 1017 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

ENE
ENE

 5 / 7 mph 76 / 77°F 62% 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
14:00

SE
SE

 4 / 4 mph 79 / 80°F 65% 1016 mb
Low level cloud: 15%
Mid level cloud: 34%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

E
E

 7 / 8 mph 79 / 81°F 73% 1016 mb
Low level cloud: 1%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

ENE
ENE

 8 / 10 mph 76 / 79°F 83% 1017 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
23:00

NE
NE

 10 / 12 mph 73 / 77°F 76% 1019 mb
Low level cloud: 3%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 22
Dec		02:00

NNE
NNE

 7 / 8 mph 67 / 67°F 60% 1018 mb
Low level cloud: 4%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

NNE
NNE

 7 / 8 mph 64 / 64°F 60% 1017 mb
Low level cloud: 7%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

NNE
NNE

 7 / 9 mph 63 / 62°F 61% 1019 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

NE
NE

 5 / 6 mph 69 / 67°F 54% 1019 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

ESE
ESE

 6 / 7 mph 70 / 69°F 57% 1017 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
17:00

ESE
ESE

 9 / 10 mph 70 / 69°F 63% 1016 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
20:00

E
E

 11 / 13 mph 67 / 67°F 73% 1017 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
23:00

E
E

 17 / 19 mph 66 / 66°F 79% 1018 mb
Low level cloud: 79%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 23
Dec		02:00

ENE
ENE

 19 / 22 mph 65 / 65°F 80% 1018 mb
Low level cloud: 89%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

ENE
ENE

 17 / 20 mph 64 / 64°F 78% 1018 mb
Low level cloud: 80%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ENE
ENE

 10 / 11 mph 65 / 64°F 77% 1020 mb
Low level cloud: 28%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

N
N

 3 / 4 mph 69 / 67°F 64% 1020 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

SW
SW

 3 / 3 mph 72 / 70°F 61% 1017 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

S
S

 3 / 3 mph 71 / 70°F 64% 1016 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

ESE
ESE

 5 / 6 mph 68 / 69°F 75% 1018 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

ENE
ENE

 6 / 8 mph 66 / 66°F 78% 1018 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 24
Dec		02:00

ENE
ENE

 13 / 16 mph 66 / 66°F 79% 1018 mb
Low level cloud: 28%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
08:00

ENE
ENE

 8 / 12 mph 69 / 69°F 78% 1019 mb
Low level cloud: 7%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
10%
0.0 In
14:00

E
E

 3 / 5 mph 79 / 82°F 61% 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

E
E

 8 / 13 mph 75 / 79°F 75% 1018 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
Thu 25
Dec		02:00

ENE
ENE

 13 / 18 mph 68 / 68°F 83% 1017 mb
Low level cloud: 31%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.0 In
08:00

ENE
ENE

 12 / 17 mph 66 / 66°F 74% 1019 mb
Low level cloud: 34%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.0 In
14:00

E
E

 5 / 6 mph 77 / 78°F 52% 1017 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
20:00

E
E

 9 / 11 mph 70 / 70°F 76% 1017 mb
Low level cloud: 24%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
Fri 26
Dec		02:00

ENE
ENE

 14 / 25 mph 60 / 60°F 76% 1018 mb
Low level cloud: 51%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
55%
0.0 In
08:00

ENE
ENE

 8 / 10 mph 67 / 67°F 78% 1018 mb
Low level cloud: 21%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.0 In
14:00

ESE
ESE

 5 / 7 mph 75 / 78°F 65% 1017 mb
Low level cloud: 19%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
20:00

ESE
ESE

 4 / 5 mph 77 / 80°F 70% 1017 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
Sat 27
Dec		02:00

ENE
ENE

 7 / 9 mph 69 / 69°F 79% 1017 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
08:00

NNE
NNE

 5 / 7 mph 70 / 70°F 74% 1019 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
14:00

NNW
NNW

 2 / 3 mph 82 / 84°F 51% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
20:00

SE
SE

 4 / 5 mph 77 / 79°F 65% 1017 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
Sun 28
Dec		02:00

ENE
ENE

 11 / 13 mph 70 / 70°F 65% 1018 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
08:00

ENE
ENE

 13 / 16 mph 66 / 66°F 76% 1018 mb
Low level cloud: 40%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.0 In
14:00

E
E

 10 / 13 mph 72 / 76°F 63% 1017 mb
Low level cloud: 3%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
3%
0.0 In
20:00

E
E

 9 / 10 mph 75 / 78°F 75% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Mon 29
Dec		02:00

E
E

 16 / 25 mph 61 / 61°F 72% 1018 mb
Low level cloud: 53%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.0 In
08:00

ENE
ENE

 11 / 14 mph 67 / 67°F 78% 1017 mb
Low level cloud: 14%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.0 In
14:00

E
E

 8 / 10 mph 75 / 78°F 59% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
20:00

E
E

 8 / 9 mph 76 / 79°F 74% 1014 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
Tue 30
Dec		02:00

ENE
ENE

 10 / 13 mph 68 / 68°F 73% 1016 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
08:00

ENE
ENE

 13 / 16 mph 66 / 66°F 81% 1015 mb
Low level cloud: 34%
Mid level cloud: 85%
High level cloud: 0%
Most Significant Cloud Type: low
63%
0.0 In
14:00

ESE
ESE

 6 / 8 mph 78 / 80°F 57% 1015 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
20:00

E
E

 10 / 13 mph 73 / 77°F 73% 1014 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
Wed 31
Dec		02:00

ENE
ENE

 7 / 9 mph 70 / 70°F 75% 1016 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
08:00

ENE
ENE

 17 / 21 mph 65 / 65°F 77% 1015 mb
Low level cloud: 13%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
81%
0.0 In
14:00

SE
SE

 5 / 6 mph 80 / 82°F 52% 1013 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
20:00

E
E

 20 / 25 mph 67 / 67°F 78% 1015 mb
Low level cloud: 20%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.0 In
Thu 01
Jan		02:00

ENE
ENE

 14 / 18 mph 67 / 67°F 83% 1014 mb
Low level cloud: 36%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
08:00

ENE
ENE

 23 / 29 mph 63 / 63°F 82% 1018 mb
Low level cloud: 78%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.0 In
14:00

E
E

 9 / 12 mph 77 / 80°F 69% 1012 mb
Low level cloud: 1%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
20:00

E
E

 20 / 25 mph 65 / 65°F 76% 1017 mb
Low level cloud: 53%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.0 In

Other Locations Near to Hong Kong

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