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Robben Island 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Robben Island

South Africa

Long range weather outlook for Robben Island includes 14 day forecast summary:

The next 14 day outlook for Robben Island shows the average daytime maximum temperature will be around 21°C, with a high for the two weeks of 30°C expected on the afternoon of Monday 13th. The mean minimum temperature will be 13°C, dipping to its lowest on the morning of Monday 13th at 10°C. The next 14 days will have most days seeing a little rain. Current predictions suggest Tuesday 7th will have the most precipitation with an accumulation of around 11.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 06
May		14:00

NW
NW

 18 / 21 mph 75 / 77°F 71% 1010 mb
Low level cloud: 1%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

NW
NW

 16 / 19 mph 68 / 67°F 79% 1010 mb
Low level cloud: 16%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

N
N

 12 / 14 mph 65 / 65°F 85% 1012 mb
Low level cloud: 15%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

NNE
NNE

 11 / 23 mph 57 / 54°F 87% 1012 mb
Low level cloud: 80%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 07
May		02:00

NNE
NNE

 12 / 21 mph 58 / 55°F 88% 1012 mb
Low level cloud: 98%
Mid level cloud: 65%
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

N
N

 10 / 18 mph 58 / 55°F 90% 1012 mb
Low level cloud: 82%
Mid level cloud: 70%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
08:00

N
N

 11 / 18 mph 58 / 56°F 90% 1014 mb
Low level cloud: 94%
Mid level cloud: 96%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

NNW
NNW

 9 / 13 mph 60 / 60°F 93% 1015 mb
Low level cloud: 80%
Mid level cloud: 86%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
14:00

NNW
NNW

 8 / 10 mph 61 / 61°F 96% 1015 mb
Low level cloud: 70%
Mid level cloud: 91%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
17:00

NNW
NNW

 9 / 13 mph 62 / 61°F 94% 1016 mb
Low level cloud: 26%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

NW
NW

 8 / 14 mph 60 / 60°F 86% 1020 mb
Low level cloud: 14%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

W
W

 5 / 9 mph 59 / 59°F 87% 1022 mb
Low level cloud: 18%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 08
May		02:00

NNE
NNE

 2 / 3 mph 59 / 59°F 86% 1023 mb
Low level cloud: 39%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

ENE
ENE

 3 / 6 mph 58 / 58°F 85% 1023 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ENE
ENE

 4 / 6 mph 59 / 58°F 86% 1024 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
11:00

S
S

 4 / 4 mph 65 / 64°F 74% 1026 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
14:00

SW
SW

 6 / 8 mph 70 / 68°F 64% 1024 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
17:00

SW
SW

 9 / 11 mph 69 / 68°F 65% 1023 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
20:00

SSE
SSE

 6 / 7 mph 67 / 67°F 70% 1023 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
23:00

SSE
SSE

 5 / 6 mph 63 / 63°F 71% 1022 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
Thu 09
May		02:00

S
S

 6 / 8 mph 60 / 60°F 75% 1021 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
05:00

SE
SE

 4 / 6 mph 59 / 59°F 77% 1020 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
08:00

SE
SE

 3 / 4 mph 61 / 60°F 78% 1020 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
11:00

S
S

 3 / 4 mph 70 / 68°F 68% 1019 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
14:00

SW
SW

 7 / 8 mph 76 / 78°F 67% 1017 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
17:00

SSW
SSW

 9 / 10 mph 75 / 78°F 74% 1016 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
20:00

SSE
SSE

 7 / 8 mph 73 / 77°F 82% 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
23:00

SSE
SSE

 3 / 4 mph 67 / 67°F 85% 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
Fri 10
May		02:00

SSE
SSE

 1 / 1 mph 62 / 62°F 88% 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
05:00

NNW
NNW

 6 / 9 mph 58 / 57°F 89% 1012 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

N
N

 11 / 17 mph 59 / 56°F 91% 1013 mb
Low level cloud: 49%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

NNW
NNW

 20 / 23 mph 64 / 64°F 80% 1013 mb
Low level cloud: 92%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NNW
NNW

 25 / 28 mph 68 / 68°F 78% 1012 mb
Low level cloud: 85%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

NW
NW

 21 / 25 mph 67 / 67°F 87% 1013 mb
Low level cloud: 96%
Mid level cloud: 60%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
20:00

WNW
WNW

 12 / 16 mph 64 / 64°F 86% 1015 mb
Low level cloud: 61%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

WSW
WSW

 11 / 16 mph 61 / 61°F 80% 1017 mb
Low level cloud: 34%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 11
May		02:00

WSW
WSW

 9 / 15 mph 58 / 57°F 80% 1018 mb
Low level cloud: 1%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WSW
WSW

 9 / 17 mph 57 / 55°F 76% 1019 mb
Low level cloud: 3%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

W
W

 8 / 14 mph 58 / 56°F 76% 1021 mb
Low level cloud: 0%
Mid level cloud: 42%
High level cloud: 0%
Most Significant Cloud Type: medium
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

WSW
WSW

 8 / 12 mph 61 / 60°F 70% 1023 mb
Low level cloud: 38%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

SSW
SSW

 9 / 13 mph 63 / 62°F 64% 1023 mb
Low level cloud: 2%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

SSW
SSW

 13 / 16 mph 63 / 62°F 66% 1024 mb
Low level cloud: 29%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SSE
SSE

 11 / 13 mph 61 / 61°F 74% 1026 mb
Low level cloud: 3%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SSE
SSE

 17 / 22 mph 59 / 56°F 67% 1027 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
Sun 12
May		02:00

SSE
SSE

 17 / 32 mph 54 / 49°F 70% 1026 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

SE
SE

 13 / 25 mph 53 / 49°F 73% 1025 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ESE
ESE

 10 / 19 mph 52 / 48°F 73% 1025 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

ESE
ESE

 10 / 15 mph 58 / 55°F 61% 1025 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
14:00

SSE
SSE

 6 / 8 mph 74 / 76°F 53% 1022 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
17:00

S
S

 8 / 9 mph 75 / 77°F 53% 1020 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
20:00

SE
SE

 8 / 10 mph 73 / 77°F 60% 1020 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
23:00

SE
SE

 9 / 16 mph 61 / 61°F 66% 1019 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
Mon 13
May		02:00

ESE
ESE

 8 / 16 mph 62 / 62°F 69% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
08:00

ESE
ESE

 9 / 19 mph 55 / 52°F 78% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
14:00

SSE
SSE

 8 / 13 mph 78 / 80°F 50% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
20:00

SE
SE

 4 / 7 mph 79 / 80°F 45% 1008 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Tue 14
May		02:00

ESE
ESE

 6 / 11 mph 71 / 71°F 65% 1010 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
08:00

N
N

 15 / 27 mph 60 / 60°F 86% 1009 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: low
6%
0.0 In
14:00

WNW
WNW

 13 / 22 mph 74 / 77°F 76% 1010 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
20:00

NNW
NNW

 14 / 27 mph 63 / 63°F 86% 1011 mb
Low level cloud: 10%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.0 In
Wed 15
May		02:00

WSW
WSW

 4 / 8 mph 61 / 61°F 88% 1014 mb
Low level cloud: 47%
Mid level cloud: 7%
High level cloud: 16%
Most Significant Cloud Type: low
51%
0.0 In
08:00

N
N

 11 / 22 mph 59 / 59°F 94% 1014 mb
Low level cloud: 22%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
24%
0.1 In
14:00

WNW
WNW

 6 / 10 mph 71 / 71°F 81% 1014 mb
Low level cloud: 1%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: medium
22%
0.0 In
20:00

NNW
NNW

 9 / 19 mph 63 / 63°F 91% 1015 mb
Low level cloud: 12%
Mid level cloud: 1%
High level cloud: 37%
Most Significant Cloud Type: low
16%
0.0 In
Thu 16
May		02:00

NNW
NNW

 4 / 8 mph 63 / 64°F 92% 1015 mb
Low level cloud: 18%
Mid level cloud: 1%
High level cloud: 100%
Most Significant Cloud Type: low
29%
0.0 In
08:00

NNE
NNE

 13 / 26 mph 57 / 54°F 92% 1016 mb
Low level cloud: 51%
Mid level cloud: 30%
High level cloud: 94%
Most Significant Cloud Type: low
73%
0.0 In
14:00

SW
SW

 6 / 10 mph 66 / 66°F 94% 1017 mb
Low level cloud: 90%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
20:00

SSE
SSE

 8 / 17 mph 61 / 61°F 89% 1017 mb
Low level cloud: 75%
Mid level cloud: 59%
High level cloud: 32%
Most Significant Cloud Type: low
99%
0.0 In
Fri 17
May		02:00

SSE
SSE

 10 / 19 mph 61 / 61°F 83% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
08:00

S
S

 18 / 36 mph 58 / 55°F 93% 1019 mb
Low level cloud: 61%
Mid level cloud: 87%
High level cloud: 1%
Most Significant Cloud Type: low
91%
0.1 In
14:00

S
S

 11 / 20 mph 70 / 70°F 70% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
20:00

SSE
SSE

 14 / 29 mph 60 / 60°F 82% 1020 mb
Low level cloud: 4%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.1 In
Sat 18
May		02:00

SSE
SSE

 7 / 13 mph 58 / 57°F 85% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 87%
Most Significant Cloud Type: high
87%
0.0 In
08:00

SE
SE

 6 / 13 mph 61 / 61°F 89% 1020 mb
Low level cloud: 5%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: medium
29%
0.0 In
14:00

S
S

 6 / 12 mph 75 / 78°F 65% 1019 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
20:00

SSE
SSE

 8 / 17 mph 66 / 66°F 85% 1018 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
Sun 19
May		02:00

SSE
SSE

 4 / 8 mph 70 / 70°F 90% 1017 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
08:00

E
E

 3 / 6 mph 65 / 65°F 84% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
14:00

SW
SW

 4 / 8 mph 80 / 83°F 68% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 91%
Most Significant Cloud Type: medium
8%
0.0 In
20:00

SSW
SSW

 4 / 8 mph 71 / 71°F 80% 1016 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: medium
14%
0.0 In
Mon 20
May		02:00

NNW
NNW

 2 / 3 mph 66 / 66°F 86% 1016 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 14%
Most Significant Cloud Type: medium
7%
0.0 In
08:00

NNE
NNE

 5 / 9 mph 64 / 64°F 86% 1017 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
0.0 In
14:00

WNW
WNW

 9 / 15 mph 67 / 67°F 80% 1018 mb
Low level cloud: 29%
Mid level cloud: 19%
High level cloud: 32%
Most Significant Cloud Type: low
39%
0.0 In
20:00

NW
NW

 7 / 15 mph 67 / 67°F 89% 1018 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.0 In
Tue 21
May		02:00

N
N

 5 / 9 mph 59 / 59°F 97% 1019 mb
Low level cloud: 43%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: low
100%
0.0 In
08:00

NNW
NNW

 9 / 19 mph 59 / 59°F 95% 1021 mb
Low level cloud: 54%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.1 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