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Sao Tome 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Sao Tome

Sao Tome And Principe

Long range weather outlook for Sao Tome includes 14 day forecast summary:

Over the next 14 days the Sao Tome forecast suggests the average daytime maximum temperature will be around 33°C, with a high for the two weeks of 34°C expected on the afternoon of Monday 13th. The mean minimum temperature will be 28°C, dipping to its lowest on the morning of Saturday 11th at 27°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. The current forecast indicates Wednesday 8th will have the most precipitation with an accumulation of around 5.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 07
May
00:00

S
S

9 / 11 mph 85 / 96°F 79% 1008 mb
Low level cloud: 27%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

8 / 10 mph 84 / 92°F 78% 1008 mb
Low level cloud: 6%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

6 / 9 mph 85 / 90°F 78% 1009 mb
Low level cloud: 3%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

5 / 6 mph 89 / 96°F 74% 1011 mb
Low level cloud: 39%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

6 / 7 mph 92 / 105°F 74% 1009 mb
Low level cloud: 39%
Mid level cloud: 61%
High level cloud: 7%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

8 / 9 mph 93 / 111°F 76% 1007 mb
Low level cloud: 29%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

6 / 7 mph 89 / 110°F 81% 1008 mb
Low level cloud: 37%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

5 / 6 mph 87 / 104°F 83% 1010 mb
Low level cloud: 15%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 08
May
00:00

S
S

7 / 9 mph 85 / 98°F 82% 1009 mb
Low level cloud: 22%
Mid level cloud: 20%
High level cloud: 6%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

6 / 8 mph 83 / 93°F 82% 1008 mb
Low level cloud: 14%
Mid level cloud: 44%
High level cloud: 17%
Most Significant Cloud Type: medium
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

5 / 7 mph 85 / 90°F 81% 1009 mb
Low level cloud: 19%
Mid level cloud: 25%
High level cloud: 8%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

6 / 8 mph 89 / 96°F 77% 1011 mb
Low level cloud: 31%
Mid level cloud: 30%
High level cloud: 34%
Most Significant Cloud Type: low
45%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

SSE
SSE

9 / 11 mph 91 / 106°F 76% 1009 mb
Low level cloud: 32%
Mid level cloud: 19%
High level cloud: 71%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

9 / 10 mph 93 / 113°F 77% 1007 mb
Low level cloud: 38%
Mid level cloud: 15%
High level cloud: 34%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

9 / 10 mph 89 / 109°F 80% 1008 mb
Low level cloud: 45%
Mid level cloud: 19%
High level cloud: 16%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

10 / 12 mph 86 / 102°F 83% 1010 mb
Low level cloud: 27%
Mid level cloud: 25%
High level cloud: 24%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 09
May
00:00

S
S

10 / 12 mph 85 / 97°F 84% 1009 mb
Low level cloud: 13%
Mid level cloud: 29%
High level cloud: 35%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

11 / 15 mph 83 / 91°F 82% 1008 mb
Low level cloud: 1%
Mid level cloud: 49%
High level cloud: 86%
Most Significant Cloud Type: medium
56%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

S
S

6 / 9 mph 85 / 89°F 81% 1009 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

6 / 8 mph 88 / 95°F 75% 1011 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

5 / 6 mph 92 / 105°F 75% 1009 mb
Low level cloud: 3%
Mid level cloud: 44%
High level cloud: 81%
Most Significant Cloud Type: medium
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

11 / 13 mph 92 / 113°F 78% 1007 mb
Low level cloud: 22%
Mid level cloud: 13%
High level cloud: 33%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

10 / 11 mph 89 / 109°F 82% 1008 mb
Low level cloud: 34%
Mid level cloud: 8%
High level cloud: 21%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

11 / 13 mph 86 / 101°F 84% 1009 mb
Low level cloud: 35%
Mid level cloud: 10%
High level cloud: 34%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 10
May
00:00

S
S

10 / 11 mph 85 / 99°F 83% 1009 mb
Low level cloud: 44%
Mid level cloud: 13%
High level cloud: 95%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

8 / 9 mph 83 / 93°F 83% 1008 mb
Low level cloud: 22%
Mid level cloud: 14%
High level cloud: 14%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

7 / 9 mph 84 / 90°F 82% 1009 mb
Low level cloud: 1%
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
09:00

S
S

7 / 8 mph 88 / 96°F 75% 1010 mb
Low level cloud: 2%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

10 / 11 mph 91 / 108°F 75% 1009 mb
Low level cloud: 18%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

10 / 11 mph 93 / 115°F 76% 1007 mb
Low level cloud: 28%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

8 / 9 mph 90 / 112°F 81% 1008 mb
Low level cloud: 38%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

8 / 9 mph 87 / 103°F 83% 1009 mb
Low level cloud: 31%
Mid level cloud: 9%
High level cloud: 3%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 11
May
00:00

SSW
SSW

9 / 10 mph 84 / 96°F 83% 1008 mb
Low level cloud: 23%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

7 / 9 mph 82 / 91°F 83% 1007 mb
Low level cloud: 22%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

7 / 11 mph 83 / 88°F 82% 1009 mb
Low level cloud: 19%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

6 / 7 mph 88 / 94°F 76% 1011 mb
Low level cloud: 13%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

7 / 8 mph 91 / 106°F 75% 1010 mb
Low level cloud: 21%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

8 / 10 mph 93 / 116°F 80% 1008 mb
Low level cloud: 44%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

7 / 11 mph 89 / 111°F 82% 1010 mb
Low level cloud: 42%
Mid level cloud: 29%
High level cloud: 2%
Most Significant Cloud Type: low
52%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

WSW
WSW

9 / 10 mph 86 / 100°F 81% 1010 mb
Low level cloud: 18%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 12
May
00:00

SSW
SSW

6 / 8 mph 85 / 97°F 82% 1009 mb
Low level cloud: 21%
Mid level cloud: 20%
High level cloud: 1%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

6 / 7 mph 83 / 92°F 82% 1008 mb
Low level cloud: 9%
Mid level cloud: 28%
High level cloud: 11%
Most Significant Cloud Type: medium
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

7 / 9 mph 85 / 89°F 82% 1009 mb
Low level cloud: 7%
Mid level cloud: 26%
High level cloud: 19%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

2 / 3 mph 88 / 95°F 77% 1012 mb
Low level cloud: 16%
Mid level cloud: 46%
High level cloud: 13%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

10 / 15 mph 90 / 104°F 77% 1011 mb
Low level cloud: 43%
Mid level cloud: 55%
High level cloud: 66%
Most Significant Cloud Type: low
70%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

SE
SE

10 / 11 mph 92 / 109°F 76% 1009 mb
Low level cloud: 3%
Mid level cloud: 49%
High level cloud: 96%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

10 / 12 mph 88 / 106°F 80% 1009 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 18%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

2 / 2 mph 87 / 102°F 81% 1010 mb
Low level cloud: 4%
Mid level cloud: 16%
High level cloud: 18%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 13
May
00:00

WNW
WNW

2 / 3 mph 86 / 99°F 81% 1009 mb
Low level cloud: 24%
Mid level cloud: 13%
High level cloud: 32%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

2 / 2 mph 84 / 94°F 82% 1008 mb
Low level cloud: 16%
Mid level cloud: 20%
High level cloud: 32%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

5 / 6 mph 85 / 89°F 82% 1010 mb
Low level cloud: 9%
Mid level cloud: 46%
High level cloud: 22%
Most Significant Cloud Type: medium
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

4 / 5 mph 89 / 96°F 78% 1012 mb
Low level cloud: 5%
Mid level cloud: 46%
High level cloud: 7%
Most Significant Cloud Type: medium
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

5 / 6 mph 92 / 107°F 76% 1010 mb
Low level cloud: 3%
Mid level cloud: 29%
High level cloud: 4%
Most Significant Cloud Type: medium
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

1 / 1 mph 94 / 114°F 77% 1009 mb
Low level cloud: 36%
Mid level cloud: 21%
High level cloud: 6%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

8 / 9 mph 90 / 110°F 81% 1009 mb
Low level cloud: 44%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

11 / 13 mph 86 / 101°F 81% 1009 mb
Low level cloud: 8%
Mid level cloud: 14%
High level cloud: 9%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 14
May
00:00

SW
SW

4 / 9 mph 85 / 97°F 84% 1010 mb
Low level cloud: 33%
Mid level cloud: 17%
High level cloud: 31%
Most Significant Cloud Type: low
42%
0.0 In
06:00

SW
SW

3 / 7 mph 83 / 91°F 81% 1010 mb
Low level cloud: 5%
Mid level cloud: 15%
High level cloud: 12%
Most Significant Cloud Type: medium
28%
0.1 In
12:00

SE
SE

6 / 13 mph 88 / 103°F 78% 1010 mb
Low level cloud: 11%
Mid level cloud: 30%
High level cloud: 11%
Most Significant Cloud Type: low
22%
0.1 In
18:00

SSE
SSE

10 / 21 mph 89 / 107°F 76% 1010 mb
Low level cloud: 5%
Mid level cloud: 12%
High level cloud: 12%
Most Significant Cloud Type: low
10%
0.0 In
Wed 15
May
00:00

WSW
WSW

6 / 13 mph 82 / 89°F 79% 1008 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 32%
Most Significant Cloud Type: medium
18%
0.2 In
06:00

SSW
SSW

6 / 13 mph 82 / 88°F 79% 1010 mb
Low level cloud: 16%
Mid level cloud: 19%
High level cloud: 32%
Most Significant Cloud Type: low
26%
0.0 In
12:00

S
S

4 / 7 mph 87 / 100°F 76% 1010 mb
Low level cloud: 13%
Mid level cloud: 25%
High level cloud: 28%
Most Significant Cloud Type: low
25%
0.1 In
18:00

SSE
SSE

8 / 17 mph 88 / 103°F 79% 1010 mb
Low level cloud: 17%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.0 In
Thu 16
May
00:00

SSW
SSW

5 / 10 mph 83 / 92°F 81% 1010 mb
Low level cloud: 45%
Mid level cloud: 14%
High level cloud: 7%
Most Significant Cloud Type: low
51%
0.1 In
06:00

SSW
SSW

6 / 14 mph 81 / 86°F 76% 1011 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: medium
9%
0.0 In
12:00

SE
SE

8 / 16 mph 87 / 100°F 76% 1011 mb
Low level cloud: 26%
Mid level cloud: 18%
High level cloud: 6%
Most Significant Cloud Type: low
33%
0.0 In
18:00

SSW
SSW

8 / 17 mph 90 / 113°F 82% 1011 mb
Low level cloud: 38%
Mid level cloud: 17%
High level cloud: 3%
Most Significant Cloud Type: low
44%
0.1 In
Fri 17
May
00:00

S
S

7 / 15 mph 82 / 90°F 82% 1011 mb
Low level cloud: 1%
Mid level cloud: 20%
High level cloud: 3%
Most Significant Cloud Type: medium
22%
0.0 In
06:00

S
S

9 / 19 mph 81 / 88°F 81% 1012 mb
Low level cloud: 50%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.0 In
12:00

S
S

8 / 16 mph 86 / 98°F 77% 1012 mb
Low level cloud: 7%
Mid level cloud: 32%
High level cloud: 100%
Most Significant Cloud Type: medium
55%
0.1 In
18:00

SSW
SSW

9 / 18 mph 88 / 101°F 75% 1011 mb
Low level cloud: 10%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: low
12%
0.0 In
Sat 18
May
00:00

S
S

8 / 17 mph 83 / 93°F 84% 1011 mb
Low level cloud: 57%
Mid level cloud: 21%
High level cloud: 2%
Most Significant Cloud Type: low
64%
0.1 In
06:00

SSW
SSW

4 / 9 mph 80 / 86°F 78% 1012 mb
Low level cloud: 37%
Mid level cloud: 6%
High level cloud: 19%
Most Significant Cloud Type: low
41%
0.0 In
12:00

SSE
SSE

8 / 17 mph 89 / 103°F 72% 1012 mb
Low level cloud: 1%
Mid level cloud: 39%
High level cloud: 98%
Most Significant Cloud Type: medium
45%
0.0 In
18:00

SSW
SSW

1 / 2 mph 90 / 107°F 75% 1011 mb
Low level cloud: 19%
Mid level cloud: 11%
High level cloud: 31%
Most Significant Cloud Type: low
26%
0.0 In
Sun 19
May
00:00

SSW
SSW

10 / 20 mph 82 / 88°F 78% 1010 mb
Low level cloud: 14%
Mid level cloud: 16%
High level cloud: 9%
Most Significant Cloud Type: low
20%
0.0 In
06:00

WNW
WNW

1 / 2 mph 82 / 88°F 77% 1012 mb
Low level cloud: 35%
Mid level cloud: 29%
High level cloud: 37%
Most Significant Cloud Type: low
49%
0.0 In
12:00

SSE
SSE

7 / 15 mph 86 / 96°F 73% 1011 mb
Low level cloud: 18%
Mid level cloud: 19%
High level cloud: 8%
Most Significant Cloud Type: low
26%
0.0 In
18:00

SSW
SSW

8 / 16 mph 87 / 100°F 76% 1010 mb
Low level cloud: 34%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
35%
0.0 In
Mon 20
May
00:00

SSW
SSW

6 / 13 mph 81 / 88°F 79% 1010 mb
Low level cloud: 24%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.1 In
06:00

SSW
SSW

5 / 11 mph 80 / 84°F 77% 1012 mb
Low level cloud: 7%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.0 In
12:00

SSE
SSE

5 / 10 mph 87 / 97°F 70% 1011 mb
Low level cloud: 4%
Mid level cloud: 12%
High level cloud: 1%
Most Significant Cloud Type: medium
22%
0.0 In
18:00

SSW
SSW

6 / 12 mph 86 / 96°F 73% 1011 mb
Low level cloud: 18%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.0 In
Tue 21
May
00:00

SSW
SSW

9 / 18 mph 81 / 88°F 79% 1011 mb
Low level cloud: 13%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
06:00

SSW
SSW

3 / 7 mph 82 / 89°F 78% 1012 mb
Low level cloud: 10%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
10%
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.
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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