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St Martin 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for St Martin

French Caribbean Islands

Long range weather outlook for St Martin includes 14 day forecast summary:

For St Martin in the coming two weeks the average daytime maximum temperature will be around 30°C, with a high for the two weeks of 31°C expected on the afternoon of Saturday 11th. The mean minimum temperature will be 26°C, dipping to its lowest on the morning of Saturday 4th at 26°C. Expect the following 14 days ahead to have most days seeing a little rain. Current predictions suggest Wednesday 8th will have the most precipitation with an accumulation of around 16.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 04
May		17:00

ENE
ENE

 9 / 11 mph 87 / 93°F 76% 1011 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 35%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

NE
NE

 10 / 13 mph 82 / 89°F 80% 1013 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
23:00

ENE
ENE

 13 / 19 mph 80 / 85°F 79% 1014 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 05
May		02:00

E
E

 12 / 17 mph 80 / 85°F 78% 1013 mb
Low level cloud: 9%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

E
E

 11 / 17 mph 80 / 84°F 79% 1013 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ESE
ESE

 11 / 17 mph 82 / 85°F 78% 1015 mb
Low level cloud: 6%
Mid level cloud: 18%
High level cloud: 33%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

E
E

 10 / 13 mph 84 / 89°F 79% 1014 mb
Low level cloud: 35%
Mid level cloud: 9%
High level cloud: 15%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

ESE
ESE

 9 / 11 mph 86 / 92°F 80% 1014 mb
Low level cloud: 33%
Mid level cloud: 11%
High level cloud: 10%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

E
E

 6 / 9 mph 86 / 92°F 81% 1013 mb
Low level cloud: 3%
Mid level cloud: 15%
High level cloud: 50%
Most Significant Cloud Type: medium
23%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
20:00

ENE
ENE

 9 / 12 mph 82 / 89°F 81% 1015 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 32%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

ENE
ENE

 11 / 15 mph 81 / 87°F 80% 1015 mb
Low level cloud: 4%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 06
May		02:00

ENE
ENE

 11 / 15 mph 80 / 85°F 81% 1013 mb
Low level cloud: 12%
Mid level cloud: 18%
High level cloud: 68%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

ENE
ENE

 11 / 17 mph 79 / 84°F 81% 1013 mb
Low level cloud: 10%
Mid level cloud: 17%
High level cloud: 32%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ENE
ENE

 12 / 17 mph 82 / 85°F 80% 1015 mb
Low level cloud: 35%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

E
E

 11 / 13 mph 84 / 90°F 80% 1014 mb
Low level cloud: 61%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

E
E

 9 / 11 mph 86 / 94°F 80% 1013 mb
Low level cloud: 43%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

ESE
ESE

 7 / 11 mph 87 / 94°F 82% 1012 mb
Low level cloud: 1%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: medium
59%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
20:00

ENE
ENE

 9 / 12 mph 82 / 89°F 78% 1013 mb
Low level cloud: 7%
Mid level cloud: 47%
High level cloud: 32%
Most Significant Cloud Type: medium
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

ENE
ENE

 11 / 14 mph 81 / 87°F 78% 1013 mb
Low level cloud: 37%
Mid level cloud: 44%
High level cloud: 12%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 07
May		02:00

E
E

 10 / 15 mph 79 / 84°F 79% 1011 mb
Low level cloud: 65%
Mid level cloud: 30%
High level cloud: 4%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

E
E

 9 / 15 mph 78 / 83°F 81% 1011 mb
Low level cloud: 16%
Mid level cloud: 27%
High level cloud: 31%
Most Significant Cloud Type: low
28%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
08:00

E
E

 8 / 10 mph 82 / 85°F 80% 1012 mb
Low level cloud: 35%
Mid level cloud: 29%
High level cloud: 9%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

E
E

 7 / 11 mph 86 / 91°F 81% 1012 mb
Low level cloud: 5%
Mid level cloud: 46%
High level cloud: 89%
Most Significant Cloud Type: medium
62%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
14:00

ENE
ENE

 4 / 6 mph 88 / 94°F 79% 1011 mb
Low level cloud: 9%
Mid level cloud: 45%
High level cloud: 50%
Most Significant Cloud Type: medium
70%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
17:00

NNE
NNE

 6 / 11 mph 84 / 92°F 73% 1011 mb
Low level cloud: 21%
Mid level cloud: 80%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
20:00

ENE
ENE

 14 / 17 mph 82 / 89°F 79% 1012 mb
Low level cloud: 7%
Mid level cloud: 45%
High level cloud: 4%
Most Significant Cloud Type: medium
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

E
E

 14 / 17 mph 80 / 86°F 80% 1012 mb
Low level cloud: 39%
Mid level cloud: 43%
High level cloud: 19%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 08
May		02:00

ESE
ESE

 10 / 16 mph 79 / 83°F 82% 1011 mb
Low level cloud: 9%
Mid level cloud: 44%
High level cloud: 30%
Most Significant Cloud Type: medium
70%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
05:00

E
E

 8 / 13 mph 78 / 82°F 76% 1011 mb
Low level cloud: 6%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
61%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
08:00

E
E

 7 / 11 mph 82 / 83°F 77% 1013 mb
Low level cloud: 8%
Mid level cloud: 32%
High level cloud: 2%
Most Significant Cloud Type: medium
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

E
E

 8 / 10 mph 83 / 86°F 75% 1013 mb
Low level cloud: 22%
Mid level cloud: 25%
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

E
E

 8 / 9 mph 85 / 88°F 75% 1012 mb
Low level cloud: 36%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

E
E

 8 / 11 mph 85 / 88°F 79% 1011 mb
Low level cloud: 8%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: medium
66%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
20:00

E
E

 8 / 14 mph 80 / 86°F 79% 1013 mb
Low level cloud: 8%
Mid level cloud: 44%
High level cloud: 59%
Most Significant Cloud Type: medium
69%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
23:00

ESE
ESE

 7 / 12 mph 80 / 84°F 76% 1014 mb
Low level cloud: 11%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
80%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Thu 09
May		02:00

ESE
ESE

 8 / 11 mph 80 / 84°F 74% 1012 mb
Low level cloud: 7%
Mid level cloud: 23%
High level cloud: 74%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

ESE
ESE

 8 / 13 mph 79 / 83°F 75% 1013 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 17%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ESE
ESE

 10 / 14 mph 82 / 84°F 76% 1014 mb
Low level cloud: 18%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

E
E

 10 / 12 mph 84 / 88°F 76% 1015 mb
Low level cloud: 29%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

E
E

 10 / 11 mph 85 / 91°F 75% 1014 mb
Low level cloud: 39%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

E
E

 11 / 12 mph 85 / 90°F 76% 1013 mb
Low level cloud: 42%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

E
E

 12 / 15 mph 82 / 88°F 78% 1015 mb
Low level cloud: 48%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

E
E

 13 / 17 mph 81 / 86°F 80% 1015 mb
Low level cloud: 27%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 10
May		02:00

E
E

 12 / 15 mph 81 / 87°F 80% 1014 mb
Low level cloud: 71%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

E
E

 12 / 17 mph 80 / 85°F 80% 1014 mb
Low level cloud: 65%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

E
E

 13 / 16 mph 83 / 87°F 80% 1015 mb
Low level cloud: 44%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

ESE
ESE

 12 / 14 mph 85 / 92°F 79% 1016 mb
Low level cloud: 42%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

ESE
ESE

 9 / 12 mph 87 / 96°F 79% 1014 mb
Low level cloud: 6%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
17:00

E
E

 8 / 10 mph 88 / 94°F 74% 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
20:00

E
E

 10 / 12 mph 83 / 91°F 78% 1016 mb
Low level cloud: 48%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

E
E

 11 / 12 mph 82 / 89°F 79% 1016 mb
Low level cloud: 54%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 11
May		02:00

ENE
ENE

 14 / 29 mph 81 / 87°F 81% 1013 mb
Low level cloud: 71%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
74%
0.0 In
08:00

E
E

 15 / 32 mph 80 / 85°F 79% 1014 mb
Low level cloud: 66%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
70%
0.0 In
14:00

ENE
ENE

 10 / 21 mph 83 / 89°F 70% 1013 mb
Low level cloud: 41%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.0 In
20:00

ENE
ENE

 9 / 19 mph 83 / 91°F 78% 1014 mb
Low level cloud: 34%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.0 In
Sun 12
May		02:00

ENE
ENE

 13 / 28 mph 80 / 85°F 78% 1013 mb
Low level cloud: 56%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
58%
0.0 In
08:00

E
E

 9 / 20 mph 81 / 87°F 79% 1015 mb
Low level cloud: 44%
Mid level cloud: 10%
High level cloud: 32%
Most Significant Cloud Type: low
51%
0.0 In
14:00

E
E

 12 / 25 mph 86 / 99°F 78% 1014 mb
Low level cloud: 58%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
59%
0.0 In
20:00

ESE
ESE

 10 / 21 mph 85 / 95°F 79% 1014 mb
Low level cloud: 51%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.0 In
Mon 13
May		02:00

E
E

 18 / 37 mph 80 / 86°F 81% 1014 mb
Low level cloud: 74%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
75%
0.1 In
08:00

ESE
ESE

 16 / 33 mph 81 / 88°F 81% 1016 mb
Low level cloud: 74%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
76%
0.0 In
14:00

E
E

 15 / 30 mph 85 / 95°F 79% 1015 mb
Low level cloud: 65%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
67%
0.0 In
20:00

E
E

 14 / 30 mph 84 / 94°F 82% 1016 mb
Low level cloud: 51%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.0 In
Tue 14
May		02:00

E
E

 17 / 35 mph 81 / 88°F 82% 1015 mb
Low level cloud: 72%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
74%
0.0 In
08:00

ESE
ESE

 15 / 31 mph 81 / 88°F 83% 1017 mb
Low level cloud: 71%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
73%
0.0 In
14:00

ESE
ESE

 15 / 31 mph 86 / 99°F 81% 1015 mb
Low level cloud: 73%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
75%
0.1 In
20:00

E
E

 13 / 27 mph 84 / 93°F 80% 1017 mb
Low level cloud: 29%
Mid level cloud: 8%
High level cloud: 5%
Most Significant Cloud Type: low
32%
0.1 In
Wed 15
May		02:00

E
E

 16 / 34 mph 81 / 87°F 80% 1013 mb
Low level cloud: 59%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.0 In
08:00

E
E

 13 / 28 mph 81 / 87°F 81% 1017 mb
Low level cloud: 36%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
14:00

E
E

 15 / 31 mph 86 / 98°F 79% 1014 mb
Low level cloud: 58%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.0 In
20:00

ENE
ENE

 16 / 34 mph 83 / 91°F 79% 1015 mb
Low level cloud: 35%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
36%
0.0 In
Thu 16
May		02:00

E
E

 21 / 44 mph 81 / 86°F 80% 1013 mb
Low level cloud: 65%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
66%
0.0 In
08:00

ENE
ENE

 17 / 35 mph 82 / 87°F 76% 1014 mb
Low level cloud: 55%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
55%
0.0 In
14:00

E
E

 17 / 35 mph 84 / 90°F 72% 1014 mb
Low level cloud: 43%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
44%
0.0 In
20:00

ENE
ENE

 18 / 37 mph 84 / 93°F 79% 1014 mb
Low level cloud: 50%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
51%
0.0 In
Fri 17
May		02:00

ENE
ENE

 18 / 37 mph 80 / 86°F 80% 1013 mb
Low level cloud: 56%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
56%
0.0 In
08:00

E
E

 18 / 38 mph 80 / 86°F 77% 1015 mb
Low level cloud: 65%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
67%
0.1 In
14:00

E
E

 16 / 34 mph 83 / 90°F 76% 1014 mb
Low level cloud: 55%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
55%
0.0 In
20:00

ENE
ENE

 18 / 38 mph 83 / 91°F 79% 1015 mb
Low level cloud: 55%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
56%
0.1 In
Sat 18
May		02:00

E
E

 19 / 39 mph 80 / 85°F 80% 1014 mb
Low level cloud: 55%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
55%
0.0 In
08:00

E
E

 18 / 37 mph 81 / 85°F 72% 1016 mb
Low level cloud: 43%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.0 In
14:00

E
E

 17 / 36 mph 84 / 92°F 78% 1016 mb
Low level cloud: 50%
Mid level cloud: 5%
High level cloud: 3%
Most Significant Cloud Type: low
51%
0.0 In
20:00

ENE
ENE

 17 / 35 mph 82 / 90°F 78% 1017 mb
Low level cloud: 55%
Mid level cloud: 1%
High level cloud: 4%
Most Significant Cloud Type: low
55%
0.0 In
Sun 19
May		02:00

E
E

 18 / 39 mph 81 / 88°F 78% 1015 mb
Low level cloud: 62%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
63%
0.0 In
08:00

E
E

 18 / 38 mph 81 / 87°F 78% 1017 mb
Low level cloud: 54%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
57%
0.0 In
14:00

E
E

 14 / 29 mph 86 / 99°F 77% 1015 mb
Low level cloud: 48%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
49%
0.0 In
20:00

E
E

 19 / 39 mph 83 / 93°F 81% 1017 mb
Low level cloud: 73%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: low
76%
0.0 In

Other Locations Near to St Martin

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