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Rome 14 Day Long Range Forecast

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

Italy

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

The forecast for Rome in the coming two weeks is predicting the average daytime maximum temperature will be around 21°C, with a high for the two weeks of 25°C expected on the afternoon of Thursday 23rd. The average minimum temperature will be 16°C, dipping to its lowest on the morning of Tuesday 28th at 12°C. The coming 14 days will have mixed overhead conditions with some days dry and some seeing a significant amount of rain. Current predictions suggest Sunday 26th will have the most precipitation with an accumulation of around 11.0mm. On the whole winds are likely to be moderate. Expect the strongest wind on the evening of Thursday 23rd, coming from a westerly direction, and reaching around 33mph. The forecast suggests the maximum gusts will be on Friday morning.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 21
Oct		19:00

ESE
ESE

 7 / 8 mph 70 / 71°F 79% 1008 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 18%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 6 / 7 mph 69 / 69°F 81% 1009 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 88%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
Oct		01:00

ESE
ESE

 8 / 10 mph 66 / 66°F 82% 1009 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 85%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

 8 / 12 mph 65 / 65°F 84% 1008 mb
Low level cloud: 33%
Mid level cloud: 28%
High level cloud: 32%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 9 / 15 mph 64 / 64°F 81% 1008 mb
Low level cloud: 63%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 12 / 16 mph 68 / 68°F 74% 1009 mb
Low level cloud: 71%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 10 / 11 mph 72 / 76°F 71% 1009 mb
Low level cloud: 63%
Mid level cloud: 15%
High level cloud: 16%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 9 / 11 mph 73 / 76°F 74% 1008 mb
Low level cloud: 25%
Mid level cloud: 35%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 9 / 12 mph 71 / 71°F 82% 1009 mb
Low level cloud: 3%
Mid level cloud: 23%
High level cloud: 33%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 9 / 13 mph 68 / 68°F 83% 1010 mb
Low level cloud: 22%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Thu 23
Oct		01:00

SE
SE

 10 / 13 mph 68 / 68°F 85% 1010 mb
Low level cloud: 72%
Mid level cloud: 40%
High level cloud: 7%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 10 / 16 mph 66 / 66°F 83% 1009 mb
Low level cloud: 50%
Mid level cloud: 22%
High level cloud: 2%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 11 / 17 mph 66 / 66°F 83% 1009 mb
Low level cloud: 51%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 13 / 17 mph 72 / 76°F 79% 1009 mb
Low level cloud: 63%
Mid level cloud: 28%
High level cloud: 60%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 14 / 23 mph 78 / 80°F 76% 1006 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 44%
Most Significant Cloud Type: medium
34%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

S
S

 17 / 25 mph 78 / 82°F 82% 1003 mb
Low level cloud: 34%
Mid level cloud: 93%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

SW
SW

 22 / 29 mph 74 / 77°F 75% 1001 mb
Low level cloud: 59%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 13 / 15 mph 71 / 71°F 73% 1002 mb
Low level cloud: 23%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
Oct		01:00

W
W

 23 / 35 mph 64 / 64°F 58% 1004 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
04:00

NNW
NNW

 5 / 6 mph 64 / 64°F 59% 1006 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 2%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 9 / 15 mph 62 / 62°F 57% 1008 mb
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 7 / 8 mph 69 / 68°F 44% 1010 mb
Low level cloud: 6%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 9 / 11 mph 70 / 69°F 46% 1010 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
16:00

S
S

 5 / 6 mph 70 / 69°F 46% 1010 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
19:00

ENE
ENE

 4 / 4 mph 69 / 69°F 50% 1011 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
22:00

NE
NE

 6 / 8 mph 64 / 64°F 57% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
Oct		01:00

ENE
ENE

 6 / 9 mph 61 / 61°F 60% 1013 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 6%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

 6 / 9 mph 59 / 59°F 64% 1013 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 31%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

E
E

 6 / 10 mph 59 / 60°F 67% 1014 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 33%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 9 / 10 mph 67 / 67°F 62% 1015 mb
Low level cloud: 2%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 11 / 13 mph 70 / 69°F 60% 1014 mb
Low level cloud: 2%
Mid level cloud: 45%
High level cloud: 3%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SW
SW

 12 / 14 mph 70 / 69°F 67% 1014 mb
Low level cloud: 55%
Mid level cloud: 13%
High level cloud: 4%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 8 / 10 mph 68 / 68°F 68% 1015 mb
Low level cloud: 76%
Mid level cloud: 99%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 14 / 18 mph 67 / 67°F 73% 1015 mb
Low level cloud: 42%
Mid level cloud: 58%
High level cloud: 0%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 26
Oct		01:00

SSE
SSE

 18 / 23 mph 67 / 67°F 73% 1013 mb
Low level cloud: 39%
Mid level cloud: 43%
High level cloud: 15%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 20 / 29 mph 66 / 66°F 80% 1011 mb
Low level cloud: 95%
Mid level cloud: 43%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 20 / 30 mph 66 / 66°F 84% 1011 mb
Low level cloud: 86%
Mid level cloud: 25%
High level cloud: 28%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 20 / 25 mph 69 / 69°F 88% 1010 mb
Low level cloud: 98%
Mid level cloud: 14%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 20 / 24 mph 72 / 76°F 90% 1009 mb
Low level cloud: 97%
Mid level cloud: 6%
High level cloud: 31%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 21 / 24 mph 73 / 77°F 89% 1007 mb
Low level cloud: 94%
Mid level cloud: 4%
High level cloud: 62%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 20 / 23 mph 71 / 71°F 88% 1006 mb
Low level cloud: 98%
Mid level cloud: 5%
High level cloud: 67%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 18 / 24 mph 68 / 68°F 87% 1006 mb
Low level cloud: 84%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
Oct		01:00

SSE
SSE

 12 / 25 mph 64 / 64°F 89% 1005 mb
Low level cloud: 33%
Mid level cloud: 12%
High level cloud: 64%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

 16 / 34 mph 62 / 62°F 84% 1005 mb
Low level cloud: 2%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
52%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

WSW
WSW

 19 / 39 mph 62 / 62°F 80% 1005 mb
Low level cloud: 65%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

 16 / 20 mph 66 / 66°F 81% 1005 mb
Low level cloud: 79%
Mid level cloud: 80%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 18 / 24 mph 70 / 70°F 75% 1004 mb
Low level cloud: 89%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

WSW
WSW

 15 / 17 mph 71 / 71°F 72% 1003 mb
Low level cloud: 23%
Mid level cloud: 77%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 10 / 11 mph 69 / 69°F 68% 1003 mb
Low level cloud: 26%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

 11 / 13 mph 66 / 66°F 78% 1004 mb
Low level cloud: 24%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 28
Oct		01:00

SSW
SSW

 10 / 20 mph 66 / 66°F 69% 1014 mb
Low level cloud: 85%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
07:00

N
N

 20 / 41 mph 56 / 52°F 62% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

NNW
NNW

 18 / 38 mph 66 / 66°F 50% 1012 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

SSE
SSE

 4 / 8 mph 72 / 72°F 56% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Wed 29
Oct		01:00

NE
NE

 4 / 9 mph 67 / 67°F 68% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

NE
NE

 10 / 20 mph 56 / 54°F 69% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
4%
0.0 In
13:00

SW
SW

 2 / 5 mph 71 / 71°F 64% 1021 mb
Low level cloud: 30%
Mid level cloud: 1%
High level cloud: 15%
Most Significant Cloud Type: low
32%
0.0 In
19:00

NNE
NNE

 6 / 13 mph 71 / 71°F 49% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
13%
0.0 In
Thu 30
Oct		01:00

ENE
ENE

 4 / 9 mph 66 / 66°F 54% 1021 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: medium
3%
0.0 In
07:00

ENE
ENE

 8 / 17 mph 59 / 57°F 60% 1015 mb
Low level cloud: 49%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
13:00

SSE
SSE

 7 / 15 mph 71 / 71°F 61% 1021 mb
Low level cloud: 12%
Mid level cloud: 6%
High level cloud: 11%
Most Significant Cloud Type: low
14%
0.0 In
19:00

SW
SW

 3 / 7 mph 70 / 70°F 61% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Fri 31
Oct		01:00

E
E

 7 / 15 mph 61 / 61°F 76% 1022 mb
Low level cloud: 47%
Mid level cloud: 23%
High level cloud: 36%
Most Significant Cloud Type: low
59%
0.0 In
07:00

NE
NE

 8 / 16 mph 57 / 56°F 61% 1024 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
13:00

WSW
WSW

 2 / 5 mph 72 / 76°F 52% 1024 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 6%
Most Significant Cloud Type: medium
2%
0.0 In
19:00

SE
SE

 13 / 27 mph 63 / 63°F 46% 1025 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.0 In
Sat 01
Nov		01:00

NNE
NNE

 5 / 10 mph 68 / 68°F 77% 1026 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
07:00

ESE
ESE

 10 / 21 mph 62 / 62°F 52% 1025 mb
Low level cloud: 11%
Mid level cloud: 31%
High level cloud: 4%
Most Significant Cloud Type: medium
62%
0.0 In
13:00

W
W

 7 / 14 mph 71 / 71°F 58% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

SSE
SSE

 7 / 14 mph 70 / 70°F 77% 1024 mb
Low level cloud: 27%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
27%
0.0 In
Sun 02
Nov		01:00

NNE
NNE

 5 / 11 mph 69 / 69°F 68% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

ESE
ESE

 7 / 15 mph 63 / 63°F 78% 1024 mb
Low level cloud: 77%
Mid level cloud: 3%
High level cloud: 11%
Most Significant Cloud Type: low
79%
0.0 In
13:00

W
W

 5 / 11 mph 77 / 79°F 56% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

SSE
SSE

 7 / 15 mph 73 / 77°F 85% 1023 mb
Low level cloud: 17%
Mid level cloud: 3%
High level cloud: 8%
Most Significant Cloud Type: low
19%
0.0 In
Mon 03
Nov		01:00

ENE
ENE

 5 / 11 mph 65 / 65°F 79% 1021 mb
Low level cloud: 52%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
51%
0.0 In
07:00

ESE
ESE

 8 / 17 mph 64 / 64°F 90% 1021 mb
Low level cloud: 63%
Mid level cloud: 16%
High level cloud: 5%
Most Significant Cloud Type: low
69%
0.0 In
13:00

S
S

 6 / 13 mph 73 / 77°F 71% 1018 mb
Low level cloud: 41%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
19:00

SSE
SSE

 15 / 30 mph 67 / 67°F 83% 1018 mb
Low level cloud: 60%
Mid level cloud: 13%
High level cloud: 69%
Most Significant Cloud Type: low
72%
0.0 In
Tue 04
Nov		01:00

SE
SE

 8 / 16 mph 69 / 69°F 80% 1016 mb
Low level cloud: 45%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
07:00

SE
SE

 22 / 46 mph 65 / 65°F 89% 1015 mb
Low level cloud: 97%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
13:00

SSE
SSE

 15 / 31 mph 71 / 71°F 70% 1013 mb
Low level cloud: 66%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: low
81%
0.0 In
19:00

SSW
SSW

 12 / 24 mph 71 / 71°F 78% 1013 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 13%
Most Significant Cloud Type: medium
10%
0.4 In
Wed 05
Nov		01:00

SSW
SSW

 10 / 21 mph 68 / 68°F 71% 1013 mb
Low level cloud: 17%
Mid level cloud: 1%
High level cloud: 4%
Most Significant Cloud Type: low
18%
0.1 In
07:00

WSW
WSW

 11 / 24 mph 64 / 64°F 68% 1013 mb
Low level cloud: 26%
Mid level cloud: 2%
High level cloud: 11%
Most Significant Cloud Type: low
28%
0.0 In
13:00

S
S

 13 / 26 mph 69 / 69°F 61% 1013 mb
Low level cloud: 27%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
19:00

W
W

 4 / 8 mph 75 / 78°F 61% 1014 mb
Low level cloud: 5%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
5%
0.0 In

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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

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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