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Key West 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Key West

Florida, United States Of America

Long range weather outlook for Key West includes 14 day forecast summary:

Reviewing the forecast for Key West Over the next 14 days and the average daytime maximum temperature will be around 32°C, with a high for the two weeks of 34°C expected on the afternoon of Sunday 19th. The mean minimum temperature will be 28°C, dipping to its lowest on the morning of Wednesday 22nd at 27°C. Expect the next 14 days have mixed weather with some days dry and some seeing a little rain. Current predictions suggest Monday 20th will have the most precipitation with an accumulation of around 2.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 16
May
13:00

W
W

11 / 12 mph 89 / 102°F 78% 1013 mb
Low level cloud: 41%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

11 / 12 mph 89 / 102°F 76% 1012 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

11 / 13 mph 87 / 98°F 75% 1012 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 1%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

5 / 5 mph 86 / 95°F 71% 1013 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
Fri 17
May
01:00

S
S

6 / 7 mph 85 / 92°F 72% 1013 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
04:00

S
S

9 / 12 mph 83 / 90°F 76% 1012 mb
Low level cloud: 1%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

10 / 13 mph 85 / 91°F 79% 1013 mb
Low level cloud: 40%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

10 / 12 mph 88 / 99°F 77% 1014 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

10 / 11 mph 91 / 107°F 77% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

6 / 7 mph 92 / 106°F 72% 1012 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

9 / 11 mph 89 / 100°F 72% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

14 / 16 mph 85 / 97°F 78% 1013 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
Sat 18
May
01:00

SE
SE

14 / 17 mph 85 / 96°F 79% 1013 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
04:00

SE
SE

15 / 21 mph 83 / 93°F 80% 1013 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

14 / 19 mph 85 / 93°F 81% 1015 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
10:00

SSE
SSE

10 / 11 mph 88 / 100°F 77% 1016 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
13:00

SSE
SSE

8 / 9 mph 91 / 107°F 74% 1015 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
16:00

NE
NE

7 / 8 mph 92 / 107°F 73% 1013 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
19:00

ESE
ESE

8 / 10 mph 90 / 103°F 76% 1014 mb
Low level cloud: 1%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

14 / 16 mph 86 / 96°F 74% 1014 mb
Low level cloud: 2%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
01:00

SE
SE

16 / 21 mph 84 / 93°F 75% 1013 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

17 / 26 mph 83 / 90°F 76% 1013 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

14 / 19 mph 84 / 90°F 78% 1014 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
10:00

S
S

8 / 10 mph 89 / 102°F 81% 1015 mb
Low level cloud: 4%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

8 / 9 mph 92 / 112°F 80% 1014 mb
Low level cloud: 27%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

2 / 2 mph 93 / 112°F 78% 1012 mb
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

6 / 7 mph 91 / 106°F 77% 1012 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
22:00

S
S

4 / 4 mph 87 / 101°F 78% 1013 mb
Low level cloud: 5%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
01:00

SSW
SSW

3 / 4 mph 85 / 96°F 81% 1012 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
04:00

E
E

0 / 1 mph 83 / 90°F 78% 1011 mb
Low level cloud: 8%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

2 / 4 mph 84 / 87°F 78% 1013 mb
Low level cloud: 7%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

1 / 2 mph 88 / 98°F 75% 1014 mb
Low level cloud: 4%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

4 / 5 mph 93 / 108°F 75% 1013 mb
Low level cloud: 19%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

6 / 7 mph 93 / 110°F 74% 1011 mb
Low level cloud: 7%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

11 / 13 mph 89 / 103°F 76% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

4 / 4 mph 85 / 95°F 75% 1013 mb
Low level cloud: 36%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
01:00

N
N

3 / 4 mph 84 / 94°F 77% 1012 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
04:00

NNW
NNW

4 / 6 mph 82 / 88°F 77% 1012 mb
Low level cloud: 4%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

5 / 7 mph 83 / 86°F 75% 1013 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

3 / 4 mph 88 / 94°F 74% 1014 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

2 / 2 mph 91 / 103°F 71% 1014 mb
Low level cloud: 2%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

4 / 4 mph 92 / 103°F 68% 1012 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

12 / 14 mph 88 / 98°F 72% 1013 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
22:00

NW
NW

3 / 3 mph 86 / 95°F 72% 1014 mb
Low level cloud: 5%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
01:00

NW
NW

4 / 5 mph 84 / 92°F 74% 1013 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 17%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

6 / 8 mph 82 / 87°F 75% 1013 mb
Low level cloud: 17%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

2 / 3 mph 85 / 87°F 73% 1015 mb
Low level cloud: 43%
Mid level cloud: 1%
High level cloud: 20%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

4 / 4 mph 88 / 94°F 73% 1016 mb
Low level cloud: 16%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

6 / 8 mph 90 / 100°F 72% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

10 / 11 mph 89 / 101°F 71% 1014 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

13 / 15 mph 87 / 95°F 68% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

12 / 14 mph 84 / 89°F 65% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 23
May
01:00

SE
SE

7 / 12 mph 83 / 89°F 69% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

SSW
SSW

3 / 4 mph 84 / 91°F 67% 1016 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
13:00

ENE
ENE

3 / 4 mph 89 / 98°F 63% 1016 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
19:00

E
E

12 / 20 mph 85 / 93°F 68% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Fri 24
May
01:00

E
E

10 / 21 mph 82 / 88°F 72% 1014 mb
Low level cloud: 62%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
63%
0.0 In
07:00

S
S

4 / 7 mph 82 / 86°F 69% 1014 mb
Low level cloud: 9%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.0 In
13:00

NW
NW

2 / 4 mph 89 / 98°F 62% 1014 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
19:00

WNW
WNW

6 / 8 mph 86 / 93°F 62% 1012 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 25
May
01:00

E
E

8 / 14 mph 84 / 89°F 68% 1013 mb
Low level cloud: 26%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
07:00

S
S

2 / 4 mph 84 / 89°F 62% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

ENE
ENE

4 / 6 mph 88 / 99°F 66% 1014 mb
Low level cloud: 17%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.0 In
19:00

NNE
NNE

2 / 3 mph 90 / 97°F 55% 1013 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
Sun 26
May
01:00

E
E

11 / 20 mph 83 / 88°F 69% 1013 mb
Low level cloud: 24%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
07:00

ESE
ESE

4 / 6 mph 83 / 89°F 70% 1015 mb
Low level cloud: 17%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.0 In
13:00

ESE
ESE

4 / 7 mph 87 / 98°F 68% 1015 mb
Low level cloud: 48%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
19:00

E
E

8 / 12 mph 86 / 95°F 71% 1015 mb
Low level cloud: 31%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
35%
0.0 In
Mon 27
May
01:00

ESE
ESE

12 / 22 mph 83 / 88°F 67% 1015 mb
Low level cloud: 17%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.0 In
07:00

E
E

12 / 18 mph 83 / 87°F 66% 1017 mb
Low level cloud: 6%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.0 In
13:00

ESE
ESE

9 / 16 mph 86 / 94°F 67% 1016 mb
Low level cloud: 29%
Mid level cloud: 3%
High level cloud: 30%
Most Significant Cloud Type: low
33%
0.0 In
19:00

E
E

17 / 25 mph 86 / 93°F 67% 1017 mb
Low level cloud: 6%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
Tue 28
May
01:00

ESE
ESE

15 / 27 mph 83 / 86°F 60% 1016 mb
Low level cloud: 1%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
07:00

ESE
ESE

12 / 18 mph 82 / 87°F 71% 1018 mb
Low level cloud: 59%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
58%
0.0 In
13:00

ESE
ESE

13 / 24 mph 86 / 94°F 64% 1017 mb
Low level cloud: 39%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
39%
0.0 In
19:00

E
E

11 / 17 mph 85 / 91°F 64% 1017 mb
Low level cloud: 5%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
Wed 29
May
01:00

ESE
ESE

13 / 25 mph 83 / 88°F 70% 1017 mb
Low level cloud: 41%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.0 In
07:00

NE
NE

7 / 11 mph 82 / 85°F 65% 1015 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
13:00

ESE
ESE

9 / 19 mph 86 / 95°F 68% 1017 mb
Low level cloud: 4%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
0.1 In
19:00

NW
NW

8 / 12 mph 86 / 95°F 69% 1014 mb
Low level cloud: 45%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
46%
0.0 In
Thu 30
May
01:00

ESE
ESE

12 / 26 mph 83 / 89°F 72% 1017 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.2 In
07:00

WSW
WSW

6 / 9 mph 82 / 86°F 69% 1014 mb
Low level cloud: 7%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
11%
0.0 In
13:00

ENE
ENE

7 / 14 mph 88 / 99°F 69% 1018 mb
Low level cloud: 19%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.0 In
19:00

WNW
WNW

13 / 21 mph 86 / 95°F 71% 1013 mb
Low level cloud: 6%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: low
7%
0.0 In
Fri 31
May
01:00

ESE
ESE

12 / 25 mph 83 / 90°F 73% 1016 mb
Low level cloud: 56%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
58%
0.1 In
07:00

W
W

9 / 15 mph 82 / 87°F 68% 1014 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
13:00

ESE
ESE

7 / 16 mph 88 / 99°F 70% 1017 mb
Low level cloud: 14%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
19:00

WNW
WNW

9 / 14 mph 86 / 95°F 73% 1014 mb
Low level cloud: 20%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.0 In

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.
(More Info)

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