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Des Plaines 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Des Plaines

Illinois, United States Of America

Long range weather outlook for Des Plaines includes 14 day forecast summary:

For Des Plaines in the coming two weeks the average daytime maximum temperature will be around 24°C, with a high for the two weeks of 33°C expected on the afternoon of Thursday 15th. The average minimum temperature will be 14°C, dipping to its lowest on the morning of Monday 19th at 8°C. The coming 14 days will have some days seeing a little precipitation and some days with rain. Current predictions suggest Tuesday 20th will have the most precipitation with an accumulation of around 77.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 12
May
12:00

E
E

9 / 10 mph 75 / 76°F 43% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

8 / 9 mph 75 / 76°F 48% 1013 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 35%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

8 / 11 mph 69 / 67°F 61% 1012 mb
Low level cloud: 5%
Mid level cloud: 30%
High level cloud: 33%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

5 / 8 mph 64 / 64°F 93% 1012 mb
Low level cloud: 17%
Mid level cloud: 48%
High level cloud: 40%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 13
May
00:00

ESE
ESE

5 / 8 mph 62 / 62°F 99% 1011 mb
Low level cloud: 90%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

ESE
ESE

6 / 9 mph 60 / 60°F 98% 1011 mb
Low level cloud: 95%
Mid level cloud: 55%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
06:00

ESE
ESE

6 / 9 mph 60 / 59°F 98% 1011 mb
Low level cloud: 98%
Mid level cloud: 28%
High level cloud: 96%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

6 / 8 mph 62 / 62°F 89% 1011 mb
Low level cloud: 90%
Mid level cloud: 23%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

5 / 6 mph 74 / 70°F 69% 1010 mb
Low level cloud: 49%
Mid level cloud: 14%
High level cloud: 14%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

7 / 8 mph 77 / 77°F 57% 1007 mb
Low level cloud: 6%
Mid level cloud: 17%
High level cloud: 6%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

7 / 9 mph 69 / 67°F 75% 1008 mb
Low level cloud: 2%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

5 / 8 mph 62 / 62°F 84% 1008 mb
Low level cloud: 7%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 14
May
00:00

ENE
ENE

4 / 7 mph 61 / 61°F 86% 1007 mb
Low level cloud: 2%
Mid level cloud: 44%
High level cloud: 9%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

3 / 7 mph 60 / 60°F 87% 1007 mb
Low level cloud: 3%
Mid level cloud: 34%
High level cloud: 13%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

3 / 6 mph 63 / 60°F 88% 1007 mb
Low level cloud: 11%
Mid level cloud: 26%
High level cloud: 3%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

4 / 5 mph 74 / 76°F 67% 1007 mb
Low level cloud: 6%
Mid level cloud: 38%
High level cloud: 2%
Most Significant Cloud Type: medium
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

6 / 7 mph 79 / 78°F 53% 1006 mb
Low level cloud: 6%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

6 / 7 mph 77 / 77°F 58% 1005 mb
Low level cloud: 0%
Mid level cloud: 41%
High level cloud: 3%
Most Significant Cloud Type: medium
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

6 / 9 mph 75 / 76°F 65% 1005 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

4 / 8 mph 67 / 67°F 76% 1006 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 15
May
00:00

SE
SE

4 / 10 mph 66 / 66°F 76% 1004 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

5 / 11 mph 66 / 66°F 89% 1003 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 1%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

9 / 15 mph 69 / 66°F 86% 1003 mb
Low level cloud: 50%
Mid level cloud: 45%
High level cloud: 12%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

14 / 16 mph 79 / 80°F 65% 1001 mb
Low level cloud: 28%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

16 / 18 mph 87 / 89°F 48% 998 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

17 / 20 mph 91 / 93°F 43% 996 mb
Low level cloud: 0%
Mid level cloud: 35%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

17 / 21 mph 81 / 82°F 54% 998 mb
Low level cloud: 15%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

13 / 17 mph 72 / 72°F 56% 1002 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 16
May
00:00

WSW
WSW

9 / 12 mph 68 / 68°F 48% 1004 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

8 / 13 mph 64 / 64°F 55% 1004 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

11 / 16 mph 65 / 64°F 54% 1005 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 5%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

15 / 17 mph 76 / 76°F 43% 1004 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

16 / 19 mph 83 / 80°F 30% 1003 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

12 / 13 mph 82 / 79°F 32% 1001 mb
Low level cloud: 0%
Mid level cloud: 42%
High level cloud: 91%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

16 / 19 mph 68 / 66°F 73% 1000 mb
Low level cloud: 1%
Mid level cloud: 58%
High level cloud: 84%
Most Significant Cloud Type: medium
62%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

WNW
WNW

4 / 5 mph 65 / 65°F 83% 1003 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sat 17
May
00:00

W
W

8 / 10 mph 61 / 61°F 81% 1004 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

5 / 8 mph 58 / 58°F 85% 1005 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
06:00

SW
SW

11 / 16 mph 59 / 56°F 71% 1005 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

16 / 19 mph 70 / 68°F 46% 1006 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

18 / 21 mph 75 / 75°F 33% 1006 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 12%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

16 / 18 mph 77 / 76°F 34% 1006 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 5%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

10 / 12 mph 74 / 76°F 45% 1007 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
21:00

NW
NW

5 / 6 mph 69 / 69°F 54% 1009 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
Sun 18
May
00:00

N
N

7 / 8 mph 63 / 63°F 64% 1010 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
03:00

NNE
NNE

5 / 6 mph 57 / 56°F 72% 1012 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
06:00

NNW
NNW

6 / 7 mph 56 / 53°F 64% 1013 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

7 / 8 mph 63 / 62°F 41% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 2%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

N
N

7 / 8 mph 68 / 66°F 38% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

7 / 8 mph 68 / 66°F 42% 1013 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
18:00

ENE
ENE

10 / 11 mph 61 / 60°F 59% 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
21:00

NE
NE

8 / 9 mph 51 / 48°F 73% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 19
May
00:00

ESE
ESE

3 / 6 mph 67 / 67°F 78% 1010 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.0 In
06:00

NNE
NNE

9 / 18 mph 50 / 47°F 65% 1014 mb
Low level cloud: 2%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
4%
0.0 In
12:00

E
E

1 / 1 mph 70 / 70°F 41% 1014 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
0.0 In
18:00

E
E

9 / 16 mph 58 / 57°F 63% 1013 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
0.0 In
Tue 20
May
00:00

S
S

14 / 29 mph 67 / 67°F 95% 998 mb
Low level cloud: 95%
Mid level cloud: 86%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSE
SSE

12 / 24 mph 67 / 67°F 95% 1009 mb
Low level cloud: 97%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

15 / 31 mph 85 / 89°F 55% 1000 mb
Low level cloud: 26%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
29%
0.0 In
18:00

SW
SW

19 / 40 mph 76 / 79°F 81% 1001 mb
Low level cloud: 61%
Mid level cloud: 67%
High level cloud: 5%
Most Significant Cloud Type: low
85%
0.1 In
Wed 21
May
00:00

SW
SW

13 / 27 mph 64 / 64°F 97% 992 mb
Low level cloud: 100%
Mid level cloud: 54%
High level cloud: 6%
Most Significant Cloud Type: low
100%
1.6 In
06:00

WSW
WSW

11 / 23 mph 63 / 63°F 60% 1006 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.1 In
12:00

W
W

16 / 33 mph 60 / 60°F 67% 1007 mb
Low level cloud: 79%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
82%
0.1 In
18:00

W
W

15 / 32 mph 58 / 55°F 56% 1012 mb
Low level cloud: 37%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.0 In
Thu 22
May
00:00

W
W

4 / 8 mph 64 / 64°F 83% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
0.0 In
06:00

W
W

11 / 23 mph 54 / 50°F 62% 1017 mb
Low level cloud: 20%
Mid level cloud: 4%
High level cloud: 22%
Most Significant Cloud Type: low
24%
0.0 In
12:00

S
S

11 / 23 mph 79 / 80°F 47% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 90%
Most Significant Cloud Type: medium
7%
0.0 In
18:00

NW
NW

9 / 19 mph 66 / 66°F 47% 1019 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
Fri 23
May
00:00

SSW
SSW

8 / 17 mph 69 / 69°F 91% 1012 mb
Low level cloud: 16%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
42%
0.1 In
06:00

WNW
WNW

8 / 17 mph 56 / 54°F 62% 1020 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 14%
Most Significant Cloud Type: medium
8%
0.0 In
12:00

WSW
WSW

10 / 21 mph 69 / 69°F 83% 1010 mb
Low level cloud: 23%
Mid level cloud: 50%
High level cloud: 16%
Most Significant Cloud Type: low
41%
0.1 In
18:00

NNW
NNW

10 / 20 mph 65 / 65°F 39% 1018 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 15%
Most Significant Cloud Type: medium
14%
0.0 In
Sat 24
May
00:00

NW
NW

5 / 10 mph 69 / 69°F 90% 1012 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.2 In
06:00

WNW
WNW

8 / 17 mph 55 / 53°F 60% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: high
8%
0.0 In
12:00

NW
NW

4 / 9 mph 76 / 78°F 44% 1014 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: medium
8%
0.0 In
18:00

WNW
WNW

6 / 13 mph 69 / 69°F 45% 1013 mb
Low level cloud: 0%
Mid level cloud: 61%
High level cloud: 79%
Most Significant Cloud Type: medium
64%
0.0 In
Sun 25
May
00:00

NW
NW

6 / 13 mph 66 / 66°F 69% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
06:00

SW
SW

7 / 15 mph 57 / 56°F 91% 1010 mb
Low level cloud: 18%
Mid level cloud: 65%
High level cloud: 2%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

NNW
NNW

8 / 17 mph 68 / 69°F 46% 1019 mb
Low level cloud: 2%
Mid level cloud: 65%
High level cloud: 0%
Most Significant Cloud Type: medium
71%
0.0 In
18:00

SW
SW

3 / 6 mph 72 / 72°F 83% 1004 mb
Low level cloud: 21%
Mid level cloud: 46%
High level cloud: 9%
Most Significant Cloud Type: low
37%
0.1 In
Mon 26
May
00:00

NE
NE

2 / 5 mph 63 / 63°F 75% 1023 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
06:00

WNW
WNW

5 / 10 mph 65 / 65°F 95% 1005 mb
Low level cloud: 33%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.2 In
12:00

E
E

8 / 16 mph 67 / 67°F 40% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: medium
2%
0.0 In
18:00

NE
NE

9 / 19 mph 62 / 62°F 61% 1012 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 79%
Most Significant Cloud Type: medium
20%
0.0 In
Tue 27
May
00:00

SSE
SSE

9 / 20 mph 61 / 61°F 65% 1018 mb
Low level cloud: 57%
Mid level cloud: 95%
High level cloud: 33%
Most Significant Cloud Type: low
94%
0.0 In
06:00

E
E

5 / 10 mph 63 / 63°F 74% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

SSW
SSW

17 / 36 mph 74 / 78°F 70% 1007 mb
Low level cloud: 93%
Mid level cloud: 7%
High level cloud: 4%
Most Significant Cloud Type: low
95%
0.2 In
18:00

E
E

6 / 13 mph 73 / 76°F 38% 1019 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
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