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Sagres 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Sagres

Portugal

Long range weather outlook for Sagres includes 14 day forecast summary:

For Sagres in the coming two weeks the average daytime maximum temperature will be around 15°C, with a high for the two weeks of 20°C expected on the morning of Monday 15th. The mean minimum temperature will be 13°C, dipping to its lowest on the evening of Monday 15th at 11°C. The coming 14 days will have some days seeing a little precipitation and some days with rain. The indicators are that Monday 15th will have the most precipitation with an accumulation of around 12.0mm. On the whole winds are likely to be moderate. The strongest wind will be experienced on the evening of Monday 15th, coming from a north westerly direction, and reaching around 42mph.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 15
Dec		18:00

SW
SW

 19 / 22 mph 62 / 62°F 82% 1008 mb
Low level cloud: 52%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 43 / 70 mph 53 / 45°F 88% 1008 mb
Low level cloud: 97%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.4 In of precipitation over the past 3 hours.
0.4 In
Tue 16
Dec		00:00

NW
NW

 35 / 45 mph 57 / 51°F 68% 1007 mb
Low level cloud: 48%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: low
83%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

NW
NW

 34 / 45 mph 57 / 52°F 65% 1008 mb
Low level cloud: 64%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 37 / 53 mph 57 / 51°F 69% 1009 mb
Low level cloud: 84%
Mid level cloud: 76%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

NNW
NNW

 38 / 52 mph 57 / 51°F 68% 1012 mb
Low level cloud: 16%
Mid level cloud: 46%
High level cloud: 5%
Most Significant Cloud Type: medium
90%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

NNW
NNW

 36 / 46 mph 58 / 52°F 66% 1014 mb
Low level cloud: 8%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

 38 / 59 mph 56 / 49°F 68% 1013 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 5%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 37 / 59 mph 56 / 49°F 70% 1015 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 36 / 57 mph 56 / 49°F 71% 1016 mb
Low level cloud: 20%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 17
Dec		00:00

NNW
NNW

 33 / 55 mph 55 / 49°F 72% 1017 mb
Low level cloud: 39%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 28 / 47 mph 55 / 50°F 71% 1018 mb
Low level cloud: 22%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 25 / 40 mph 55 / 50°F 72% 1019 mb
Low level cloud: 3%
Mid level cloud: 8%
High level cloud: 3%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

 20 / 30 mph 56 / 51°F 70% 1020 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 3%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

N
N

 19 / 32 mph 55 / 51°F 69% 1021 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 82%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

 17 / 32 mph 55 / 51°F 69% 1020 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 3%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

 15 / 29 mph 55 / 51°F 74% 1021 mb
Low level cloud: 0%
Mid level cloud: 41%
High level cloud: 10%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 11 / 21 mph 55 / 52°F 74% 1022 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 3%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 18
Dec		00:00

NE
NE

 7 / 9 mph 59 / 59°F 75% 1022 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 4 / 5 mph 59 / 59°F 70% 1021 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
06:00

NNW
NNW

 1 / 1 mph 58 / 58°F 69% 1021 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
09:00

SE
SE

 6 / 8 mph 60 / 59°F 71% 1021 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
12:00

SSW
SSW

 8 / 9 mph 63 / 62°F 70% 1021 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 9 / 10 mph 64 / 63°F 72% 1019 mb
Low level cloud: 21%
Mid level cloud: 12%
High level cloud: 49%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

 12 / 15 mph 62 / 62°F 74% 1019 mb
Low level cloud: 30%
Mid level cloud: 57%
High level cloud: 32%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 13 / 21 mph 60 / 60°F 75% 1019 mb
Low level cloud: 23%
Mid level cloud: 60%
High level cloud: 97%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 19
Dec		00:00

SSW
SSW

 15 / 28 mph 58 / 55°F 77% 1018 mb
Low level cloud: 69%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 16 / 32 mph 57 / 54°F 82% 1017 mb
Low level cloud: 90%
Mid level cloud: 55%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 10 / 19 mph 57 / 54°F 85% 1016 mb
Low level cloud: 35%
Mid level cloud: 100%
High level cloud: 41%
Most Significant Cloud Type: low
75%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

ENE
ENE

 6 / 10 mph 59 / 58°F 84% 1016 mb
Low level cloud: 65%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

N
N

 26 / 30 mph 61 / 61°F 83% 1018 mb
Low level cloud: 75%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

 27 / 31 mph 62 / 62°F 78% 1017 mb
Low level cloud: 91%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

 26 / 30 mph 61 / 61°F 84% 1018 mb
Low level cloud: 72%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 20 / 24 mph 59 / 59°F 89% 1019 mb
Low level cloud: 98%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 20
Dec		00:00

ENE
ENE

 16 / 22 mph 57 / 53°F 86% 1020 mb
Low level cloud: 61%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 9 / 14 mph 56 / 54°F 81% 1021 mb
Low level cloud: 31%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 12 / 18 mph 56 / 53°F 79% 1020 mb
Low level cloud: 7%
Mid level cloud: 30%
High level cloud: 30%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

 10 / 14 mph 57 / 55°F 79% 1021 mb
Low level cloud: 53%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

N
N

 16 / 21 mph 58 / 55°F 78% 1022 mb
Low level cloud: 60%
Mid level cloud: 56%
High level cloud: 100%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

 19 / 24 mph 59 / 55°F 64% 1020 mb
Low level cloud: 40%
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
18:00

NNW
NNW

 15 / 21 mph 58 / 55°F 70% 1020 mb
Low level cloud: 43%
Mid level cloud: 0%
High level cloud: 24%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 13 / 20 mph 57 / 55°F 69% 1020 mb
Low level cloud: 33%
Mid level cloud: 5%
High level cloud: 7%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 21
Dec		00:00

WNW
WNW

 15 / 26 mph 57 / 54°F 73% 1019 mb
Low level cloud: 59%
Mid level cloud: 17%
High level cloud: 5%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

 19 / 34 mph 56 / 52°F 79% 1017 mb
Low level cloud: 86%
Mid level cloud: 81%
High level cloud: 45%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

NW
NW

 20 / 35 mph 56 / 51°F 73% 1016 mb
Low level cloud: 55%
Mid level cloud: 44%
High level cloud: 26%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

 20 / 29 mph 58 / 53°F 74% 1016 mb
Low level cloud: 46%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

 17 / 22 mph 60 / 59°F 71% 1016 mb
Low level cloud: 49%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 19 / 23 mph 61 / 60°F 70% 1014 mb
Low level cloud: 64%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 21 / 24 mph 59 / 59°F 66% 1014 mb
Low level cloud: 29%
Mid level cloud: 21%
High level cloud: 35%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 17 / 19 mph 58 / 55°F 67% 1015 mb
Low level cloud: 39%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 22
Dec		00:00

E
E

 21 / 45 mph 56 / 51°F 86% 1014 mb
Low level cloud: 29%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

E
E

 10 / 21 mph 53 / 50°F 73% 1018 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
4%
0.0 In
12:00

WSW
WSW

 8 / 17 mph 61 / 61°F 69% 1018 mb
Low level cloud: 44%
Mid level cloud: 25%
High level cloud: 33%
Most Significant Cloud Type: low
56%
0.0 In
18:00

NNE
NNE

 18 / 37 mph 56 / 52°F 65% 1019 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Tue 23
Dec		00:00

NW
NW

 14 / 30 mph 57 / 54°F 65% 1019 mb
Low level cloud: 60%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.0 In
06:00

W
W

 12 / 25 mph 58 / 56°F 71% 1015 mb
Low level cloud: 4%
Mid level cloud: 31%
High level cloud: 18%
Most Significant Cloud Type: medium
44%
0.0 In
12:00

NNW
NNW

 13 / 27 mph 60 / 60°F 68% 1021 mb
Low level cloud: 30%
Mid level cloud: 4%
High level cloud: 10%
Most Significant Cloud Type: low
32%
0.0 In
18:00

NNE
NNE

 16 / 34 mph 56 / 51°F 58% 1018 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 14%
Most Significant Cloud Type: medium
9%
0.0 In
Wed 24
Dec		00:00

E
E

 9 / 19 mph 56 / 53°F 79% 1012 mb
Low level cloud: 50%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
06:00

NNE
NNE

 11 / 24 mph 51 / 46°F 59% 1019 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
12:00

N
N

 16 / 33 mph 57 / 54°F 70% 1014 mb
Low level cloud: 7%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
18:00

N
N

 18 / 37 mph 55 / 50°F 57% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Thu 25
Dec		00:00

N
N

 9 / 19 mph 55 / 53°F 73% 1014 mb
Low level cloud: 52%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
54%
0.0 In
06:00

N
N

 21 / 44 mph 49 / 42°F 65% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

NW
NW

 15 / 31 mph 57 / 54°F 62% 1016 mb
Low level cloud: 28%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.1 In
18:00

WNW
WNW

 5 / 10 mph 55 / 55°F 64% 1016 mb
Low level cloud: 98%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
98%
0.0 In
Fri 26
Dec		00:00

NW
NW

 11 / 24 mph 57 / 54°F 64% 1017 mb
Low level cloud: 45%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.0 In
06:00

SSE
SSE

 17 / 35 mph 49 / 43°F 74% 1010 mb
Low level cloud: 87%
Mid level cloud: 77%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SE
SE

 9 / 19 mph 61 / 61°F 77% 1017 mb
Low level cloud: 36%
Mid level cloud: 79%
High level cloud: 100%
Most Significant Cloud Type: low
75%
0.0 In
18:00

ENE
ENE

 30 / 63 mph 55 / 48°F 89% 1004 mb
Low level cloud: 97%
Mid level cloud: 87%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.6 In
Sat 27
Dec		00:00

S
S

 16 / 33 mph 60 / 60°F 68% 1013 mb
Low level cloud: 13%
Mid level cloud: 75%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

ESE
ESE

 15 / 32 mph 55 / 51°F 69% 1001 mb
Low level cloud: 73%
Mid level cloud: 22%
High level cloud: 32%
Most Significant Cloud Type: low
84%
0.9 In
12:00

NNW
NNW

 20 / 42 mph 64 / 64°F 86% 1008 mb
Low level cloud: 22%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: medium
100%
0.5 In
18:00

ESE
ESE

 18 / 37 mph 57 / 53°F 74% 1002 mb
Low level cloud: 62%
Mid level cloud: 23%
High level cloud: 32%
Most Significant Cloud Type: low
74%
0.3 In
Sun 28
Dec		00:00

SW
SW

 12 / 26 mph 58 / 56°F 66% 1007 mb
Low level cloud: 47%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
56%
0.0 In
06:00

ESE
ESE

 20 / 42 mph 54 / 49°F 84% 1005 mb
Low level cloud: 89%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
12:00

WSW
WSW

 4 / 9 mph 62 / 62°F 54% 1009 mb
Low level cloud: 13%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.1 In
18:00

ESE
ESE

 25 / 53 mph 56 / 51°F 82% 1007 mb
Low level cloud: 69%
Mid level cloud: 92%
High level cloud: 97%
Most Significant Cloud Type: low
100%
1.0 In
Mon 29
Dec		00:00

S
S

 6 / 12 mph 57 / 56°F 52% 1010 mb
Low level cloud: 33%
Mid level cloud: 8%
High level cloud: 32%
Most Significant Cloud Type: low
39%
0.0 In
06:00

SSE
SSE

 17 / 36 mph 56 / 52°F 81% 1012 mb
Low level cloud: 20%
Mid level cloud: 78%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.6 In
12:00

SE
SE

 14 / 29 mph 58 / 55°F 62% 1010 mb
Low level cloud: 21%
Mid level cloud: 44%
High level cloud: 74%
Most Significant Cloud Type: low
45%
0.1 In
18:00

E
E

 13 / 27 mph 59 / 60°F 71% 1017 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
0.1 In
Tue 30
Dec		00:00

SE
SE

 34 / 70 mph 56 / 49°F 82% 1004 mb
Low level cloud: 91%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.5 In
06:00

E
E

 13 / 28 mph 56 / 53°F 72% 1018 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
12:00

SW
SW

 20 / 42 mph 56 / 51°F 71% 1007 mb
Low level cloud: 85%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: low
90%
1.1 In
18:00

E
E

 6 / 12 mph 58 / 57°F 75% 1019 mb
Low level cloud: 37%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
38%
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