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Bethesda 14 Day Long Range Forecast

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

Maryland, United States Of America

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

For Bethesda in the coming two weeks the average daytime maximum temperature will be around 31°C, with a high for the two weeks of 38°C expected on the afternoon of Monday 11th. The average minimum temperature will be 21°C, dipping to its lowest on the morning of Sunday 3rd at 17°C. The coming 14 days will remain predominantly dry. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 02
Aug		01:00

NNE
NNE

 3 / 4 mph 67 / 67°F 86% 1023 mb
Low level cloud: 4%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 4 / 7 mph 63 / 63°F 88% 1023 mb
Low level cloud: 2%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 5 / 7 mph 68 / 66°F 75% 1024 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
10:00

NNE
NNE

 5 / 6 mph 80 / 78°F 50% 1024 mb
Low level cloud: 36%
Mid level cloud: 20%
High level cloud: 42%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNE
NNE

 6 / 7 mph 82 / 79°F 41% 1022 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 87%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNE
NNE

 6 / 7 mph 82 / 79°F 40% 1022 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 12%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

 5 / 7 mph 77 / 77°F 60% 1022 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
22:00

ENE
ENE

 4 / 5 mph 72 / 76°F 65% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 17%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 03
Aug		16:00

ESE
ESE

 7 / 8 mph 84 / 81°F 37% 1019 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 32%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 4 / 5 mph 80 / 79°F 55% 1020 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
22:00

ESE
ESE

 2 / 3 mph 73 / 76°F 61% 1021 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 17%
Most Significant Cloud Type: high
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 04
Aug		01:00

SE
SE

 1 / 2 mph 69 / 69°F 70% 1021 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 37%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

 2 / 4 mph 66 / 66°F 75% 1021 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
07:00

N
N

 4 / 5 mph 69 / 67°F 69% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 4 / 4 mph 81 / 79°F 50% 1023 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
13:00

E
E

 6 / 7 mph 87 / 83°F 34% 1021 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
16:00

ESE
ESE

 8 / 10 mph 86 / 83°F 36% 1021 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 4 / 7 mph 79 / 78°F 54% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 74%
Most Significant Cloud Type: high
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 2 / 4 mph 73 / 77°F 60% 1023 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 52%
Most Significant Cloud Type: high
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 05
Aug		01:00

WNW
WNW

 0 / 1 mph 72 / 72°F 65% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 99%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 3 / 5 mph 68 / 68°F 69% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 88%
Most Significant Cloud Type: high
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 3 / 5 mph 73 / 70°F 67% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 45%
Most Significant Cloud Type: high
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

E
E

 6 / 7 mph 83 / 80°F 46% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: high
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

 9 / 10 mph 87 / 83°F 32% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 22%
Most Significant Cloud Type: high
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

 9 / 10 mph 87 / 83°F 35% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

 5 / 6 mph 83 / 81°F 52% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

 4 / 5 mph 76 / 78°F 61% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 06
Aug		01:00

ENE
ENE

 4 / 6 mph 69 / 69°F 82% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 20%
Most Significant Cloud Type: high
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 5 / 7 mph 67 / 67°F 89% 1027 mb
Low level cloud: 13%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 6 / 8 mph 70 / 67°F 79% 1028 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 88%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ENE
ENE

 8 / 9 mph 80 / 79°F 51% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 18%
Most Significant Cloud Type: high
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

 9 / 11 mph 85 / 83°F 41% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 23%
Most Significant Cloud Type: high
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

 9 / 11 mph 86 / 83°F 39% 1025 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

 6 / 8 mph 82 / 81°F 58% 1026 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 8%
Most Significant Cloud Type: high
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

 4 / 5 mph 74 / 77°F 71% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 07
Aug		01:00

NE
NE

 3 / 4 mph 70 / 70°F 81% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 4 / 6 mph 67 / 67°F 87% 1026 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 6 / 8 mph 71 / 69°F 77% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ENE
ENE

 7 / 8 mph 81 / 80°F 52% 1027 mb
Low level cloud: 3%
Mid level cloud: 4%
High level cloud: 8%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

 8 / 10 mph 86 / 84°F 40% 1025 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 11%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 9 / 10 mph 86 / 84°F 41% 1024 mb
Low level cloud: 1%
Mid level cloud: 10%
High level cloud: 3%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

 6 / 8 mph 81 / 80°F 56% 1024 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 9%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 6 / 7 mph 74 / 77°F 66% 1025 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 5%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 08
Aug		01:00

E
E

 3 / 3 mph 70 / 70°F 79% 1025 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 8%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

 2 / 4 mph 67 / 67°F 84% 1024 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 14%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ENE
ENE

 3 / 4 mph 71 / 69°F 76% 1025 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 12%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

E
E

 5 / 5 mph 82 / 80°F 46% 1025 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 7%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

 8 / 9 mph 86 / 83°F 35% 1024 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 6%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 8 / 9 mph 86 / 84°F 38% 1022 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 8%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

 6 / 8 mph 82 / 81°F 54% 1022 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 2%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 4 / 6 mph 74 / 78°F 67% 1023 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 09
Aug		01:00

SSW
SSW

 2 / 4 mph 79 / 87°F 91% 1019 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 100%
Most Significant Cloud Type: medium
36%
0.0 In
07:00

N
N

 1 / 1 mph 79 / 83°F 74% 1024 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

ESE
ESE

 2 / 3 mph 97 / 104°F 39% 1017 mb
Low level cloud: 6%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
36%
0.0 In
19:00

ESE
ESE

 5 / 7 mph 92 / 103°F 57% 1016 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
Sun 10
Aug		01:00

SSE
SSE

 4 / 6 mph 81 / 88°F 78% 1023 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 14%
Most Significant Cloud Type: medium
23%
0.0 In
07:00

S
S

 4 / 5 mph 76 / 80°F 77% 1022 mb
Low level cloud: 0%
Mid level cloud: 78%
High level cloud: 99%
Most Significant Cloud Type: medium
82%
0.0 In
13:00

S
S

 4 / 4 mph 97 / 102°F 36% 1020 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
19:00

ESE
ESE

 3 / 4 mph 94 / 107°F 53% 1019 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
Mon 11
Aug		01:00

S
S

 5 / 6 mph 80 / 82°F 57% 1020 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.0 In
07:00

WSW
WSW

 3 / 4 mph 84 / 88°F 62% 1020 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
13:00

SSW
SSW

 6 / 8 mph 98 / 103°F 36% 1017 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 8%
Most Significant Cloud Type: medium
45%
0.0 In
19:00

SE
SE

 7 / 8 mph 94 / 105°F 54% 1016 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
Tue 12
Aug		01:00

S
S

 6 / 7 mph 81 / 85°F 67% 1016 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 12%
Most Significant Cloud Type: medium
27%
0.1 In
07:00

WSW
WSW

 3 / 4 mph 86 / 96°F 70% 1015 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 17%
Most Significant Cloud Type: medium
12%
0.0 In
13:00

SSW
SSW

 8 / 10 mph 99 / 105°F 34% 1014 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.0 In
19:00

SSE
SSE

 4 / 5 mph 94 / 104°F 53% 1011 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: medium
47%
0.0 In
Wed 13
Aug		01:00

ESE
ESE

 3 / 4 mph 88 / 103°F 78% 1014 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In
07:00

WNW
WNW

 5 / 10 mph 79 / 84°F 87% 1014 mb
Low level cloud: 2%
Mid level cloud: 42%
High level cloud: 5%
Most Significant Cloud Type: medium
46%
0.5 In
13:00

NNW
NNW

 4 / 6 mph 83 / 90°F 76% 1016 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 48%
Most Significant Cloud Type: medium
32%
0.0 In
19:00

WNW
WNW

 5 / 9 mph 84 / 92°F 74% 1015 mb
Low level cloud: 7%
Mid level cloud: 26%
High level cloud: 64%
Most Significant Cloud Type: medium
49%
0.0 In
Thu 14
Aug		01:00

NW
NW

 3 / 5 mph 84 / 98°F 90% 1017 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.1 In
07:00

NNW
NNW

 4 / 8 mph 76 / 81°F 90% 1018 mb
Low level cloud: 2%
Mid level cloud: 45%
High level cloud: 16%
Most Significant Cloud Type: medium
50%
0.1 In
13:00

NNE
NNE

 4 / 8 mph 97 / 101°F 35% 1018 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
19:00

NNW
NNW

 2 / 3 mph 85 / 92°F 64% 1019 mb
Low level cloud: 1%
Mid level cloud: 49%
High level cloud: 48%
Most Significant Cloud Type: medium
54%
0.0 In
Fri 15
Aug		01:00

NE
NE

 2 / 4 mph 87 / 96°F 65% 1018 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 1%
Most Significant Cloud Type: medium
13%
0.0 In
07:00

NNE
NNE

 2 / 5 mph 77 / 81°F 82% 1021 mb
Low level cloud: 13%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: medium
82%
0.1 In
13:00

E
E

 5 / 10 mph 95 / 100°F 39% 1017 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
0.0 In
19:00

SE
SE

 3 / 7 mph 80 / 88°F 91% 1019 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 15%
Most Significant Cloud Type: medium
46%
0.3 In
Sat 16
Aug		01:00

S
S

 2 / 4 mph 87 / 100°F 79% 1016 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
07:00

ESE
ESE

 3 / 6 mph 75 / 79°F 97% 1019 mb
Low level cloud: 80%
Mid level cloud: 84%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.3 In
13:00

SSW
SSW

 5 / 10 mph 98 / 104°F 38% 1012 mb
Low level cloud: 0%
Mid level cloud: 53%
High level cloud: 0%
Most Significant Cloud Type: medium
52%
0.0 In
19:00

ESE
ESE

 4 / 9 mph 79 / 85°F 92% 1018 mb
Low level cloud: 9%
Mid level cloud: 46%
High level cloud: 46%
Most Significant Cloud Type: medium
72%
0.4 In
Sun 17
Aug		01:00

S
S

 3 / 6 mph 86 / 99°F 81% 1011 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: medium
4%
0.0 In
07:00

NE
NE

 5 / 11 mph 75 / 79°F 93% 1018 mb
Low level cloud: 78%
Mid level cloud: 28%
High level cloud: 95%
Most Significant Cloud Type: low
99%
0.0 In
13:00

WNW
WNW

 8 / 15 mph 91 / 94°F 43% 1012 mb
Low level cloud: 0%
Mid level cloud: 53%
High level cloud: 32%
Most Significant Cloud Type: medium
54%
0.0 In
19:00

SE
SE

 4 / 8 mph 83 / 90°F 78% 1016 mb
Low level cloud: 43%
Mid level cloud: 9%
High level cloud: 87%
Most Significant Cloud Type: low
56%
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