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Markham 14 Day Long Range Forecast

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

Ontario, Canada

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

For Markham in the coming two weeks the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 22°C expected on the afternoon of Tuesday 14th. The mean minimum temperature will be 9°C, dipping to its lowest on the morning of Monday 13th at 6°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. Current predictions suggest Saturday 11th will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 06
May		11:00

NNW
NNW

 7 / 8 mph 61 / 58°F 47% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NNW
NNW

 6 / 6 mph 67 / 65°F 38% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

NW
NW

 5 / 6 mph 68 / 65°F 38% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

NNW
NNW

 7 / 10 mph 60 / 58°F 61% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 41%
Most Significant Cloud Type: high
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

NNW
NNW

 7 / 9 mph 57 / 56°F 63% 1014 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
Tue 07
May		02:00

NNW
NNW

 6 / 12 mph 50 / 48°F 63% 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

N
N

 6 / 12 mph 48 / 46°F 72% 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
08:00

NE
NE

 4 / 6 mph 54 / 52°F 63% 1012 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

ESE
ESE

 6 / 7 mph 64 / 62°F 49% 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
14:00

SE
SE

 8 / 9 mph 67 / 65°F 46% 1007 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

ESE
ESE

 8 / 9 mph 67 / 65°F 44% 1005 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

ESE
ESE

 6 / 10 mph 60 / 58°F 59% 1004 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 81%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

ENE
ENE

 3 / 4 mph 55 / 55°F 85% 1005 mb
Low level cloud: 20%
Mid level cloud: 48%
High level cloud: 82%
Most Significant Cloud Type: low
46%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 08
May		02:00

SE
SE

 4 / 6 mph 53 / 52°F 91% 1003 mb
Low level cloud: 43%
Mid level cloud: 43%
High level cloud: 6%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

NE
NE

 2 / 4 mph 51 / 51°F 96% 1003 mb
Low level cloud: 79%
Mid level cloud: 35%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

NW
NW

 2 / 3 mph 54 / 54°F 93% 1003 mb
Low level cloud: 97%
Mid level cloud: 99%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
11:00

SSW
SSW

 3 / 4 mph 55 / 54°F 94% 1004 mb
Low level cloud: 91%
Mid level cloud: 18%
High level cloud: 1%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

WSW
WSW

 3 / 4 mph 58 / 58°F 88% 1005 mb
Low level cloud: 74%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

WNW
WNW

 4 / 5 mph 63 / 63°F 72% 1005 mb
Low level cloud: 80%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

NE
NE

 2 / 3 mph 58 / 58°F 88% 1007 mb
Low level cloud: 61%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

E
E

 4 / 5 mph 53 / 52°F 95% 1009 mb
Low level cloud: 88%
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
Thu 09
May		02:00

E
E

 7 / 11 mph 50 / 47°F 95% 1010 mb
Low level cloud: 89%
Mid level cloud: 30%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

E
E

 8 / 12 mph 49 / 45°F 88% 1009 mb
Low level cloud: 45%
Mid level cloud: 15%
High level cloud: 88%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ENE
ENE

 11 / 15 mph 50 / 45°F 82% 1009 mb
Low level cloud: 34%
Mid level cloud: 68%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

E
E

 13 / 15 mph 53 / 49°F 74% 1009 mb
Low level cloud: 4%
Mid level cloud: 97%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

E
E

 12 / 14 mph 56 / 51°F 89% 1008 mb
Low level cloud: 35%
Mid level cloud: 70%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
17:00

ENE
ENE

 11 / 12 mph 55 / 52°F 94% 1006 mb
Low level cloud: 75%
Mid level cloud: 88%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
20:00

NE
NE

 13 / 15 mph 53 / 48°F 93% 1005 mb
Low level cloud: 79%
Mid level cloud: 87%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
23:00

NNE
NNE

 13 / 15 mph 51 / 47°F 94% 1004 mb
Low level cloud: 86%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Fri 10
May		02:00

NNE
NNE

 13 / 18 mph 49 / 44°F 94% 1001 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
05:00

N
N

 11 / 15 mph 48 / 43°F 94% 1001 mb
Low level cloud: 97%
Mid level cloud: 98%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

NNW
NNW

 12 / 16 mph 47 / 42°F 93% 1001 mb
Low level cloud: 95%
Mid level cloud: 75%
High level cloud: 39%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

NNW
NNW

 12 / 16 mph 48 / 42°F 91% 1002 mb
Low level cloud: 95%
Mid level cloud: 85%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

N
N

 14 / 17 mph 52 / 47°F 79% 1003 mb
Low level cloud: 60%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

NNW
NNW

 12 / 14 mph 56 / 53°F 66% 1003 mb
Low level cloud: 72%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

NW
NW

 4 / 7 mph 56 / 53°F 70% 1004 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

NW
NW

 7 / 10 mph 52 / 49°F 71% 1004 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 11
May		02:00

NW
NW

 7 / 14 mph 47 / 44°F 59% 1004 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WNW
WNW

 6 / 13 mph 45 / 42°F 54% 1003 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 12%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

WSW
WSW

 5 / 8 mph 49 / 47°F 53% 1003 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

SW
SW

 9 / 11 mph 59 / 56°F 50% 1001 mb
Low level cloud: 3%
Mid level cloud: 63%
High level cloud: 17%
Most Significant Cloud Type: medium
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

WSW
WSW

 14 / 18 mph 58 / 55°F 66% 1000 mb
Low level cloud: 72%
Mid level cloud: 45%
High level cloud: 10%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

WSW
WSW

 6 / 9 mph 57 / 54°F 80% 998 mb
Low level cloud: 60%
Mid level cloud: 61%
High level cloud: 19%
Most Significant Cloud Type: low
83%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
20:00

NW
NW

 10 / 14 mph 52 / 48°F 86% 1000 mb
Low level cloud: 4%
Mid level cloud: 30%
High level cloud: 1%
Most Significant Cloud Type: medium
40%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
23:00

W
W

 7 / 9 mph 49 / 45°F 87% 1001 mb
Low level cloud: 82%
Mid level cloud: 24%
High level cloud: 3%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 12
May		02:00

W
W

 9 / 11 mph 46 / 42°F 86% 1001 mb
Low level cloud: 71%
Mid level cloud: 75%
High level cloud: 0%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

W
W

 9 / 11 mph 46 / 41°F 90% 1002 mb
Low level cloud: 95%
Mid level cloud: 52%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

W
W

 10 / 12 mph 47 / 42°F 85% 1003 mb
Low level cloud: 88%
Mid level cloud: 20%
High level cloud: 20%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

W
W

 9 / 11 mph 55 / 52°F 63% 1003 mb
Low level cloud: 82%
Mid level cloud: 45%
High level cloud: 7%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

W
W

 9 / 11 mph 55 / 52°F 65% 1002 mb
Low level cloud: 61%
Mid level cloud: 100%
High level cloud: 22%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

W
W

 6 / 8 mph 56 / 53°F 70% 1002 mb
Low level cloud: 50%
Mid level cloud: 70%
High level cloud: 2%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

NNW
NNW

 8 / 11 mph 53 / 49°F 81% 1004 mb
Low level cloud: 1%
Mid level cloud: 22%
High level cloud: 1%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

WNW
WNW

 7 / 12 mph 47 / 44°F 91% 1006 mb
Low level cloud: 2%
Mid level cloud: 25%
High level cloud: 2%
Most Significant Cloud Type: medium
30%
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

SW
SW

 4 / 8 mph 50 / 49°F 92% 997 mb
Low level cloud: 78%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.0 In
08:00

WSW
WSW

 11 / 21 mph 55 / 52°F 65% 1008 mb
Low level cloud: 0%
Mid level cloud: 97%
High level cloud: 6%
Most Significant Cloud Type: medium
97%
0.0 In
14:00

WSW
WSW

 5 / 11 mph 67 / 67°F 44% 1010 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 11%
Most Significant Cloud Type: medium
30%
0.0 In
20:00

WSW
WSW

 17 / 34 mph 62 / 62°F 70% 1007 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 24%
Most Significant Cloud Type: medium
32%
0.0 In
Tue 14
May		02:00

SSW
SSW

 8 / 16 mph 56 / 54°F 70% 1011 mb
Low level cloud: 0%
Mid level cloud: 76%
High level cloud: 1%
Most Significant Cloud Type: medium
75%
0.0 In
08:00

WSW
WSW

 11 / 22 mph 58 / 55°F 86% 1009 mb
Low level cloud: 47%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
62%
0.1 In
14:00

WSW
WSW

 14 / 29 mph 69 / 69°F 51% 1007 mb
Low level cloud: 1%
Mid level cloud: 30%
High level cloud: 48%
Most Significant Cloud Type: medium
35%
0.0 In
20:00

WSW
WSW

 12 / 26 mph 64 / 64°F 86% 1007 mb
Low level cloud: 0%
Mid level cloud: 36%
High level cloud: 36%
Most Significant Cloud Type: medium
37%
0.3 In
Wed 15
May		02:00

WNW
WNW

 9 / 18 mph 48 / 45°F 54% 1012 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
08:00

WSW
WSW

 7 / 15 mph 63 / 63°F 89% 1010 mb
Low level cloud: 7%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.2 In
14:00

NW
NW

 11 / 23 mph 60 / 60°F 43% 1015 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
20:00

SW
SW

 5 / 10 mph 70 / 70°F 84% 1009 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
0.2 In
Thu 16
May		02:00

N
N

 8 / 16 mph 47 / 44°F 77% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
0.0 In
08:00

ESE
ESE

 7 / 16 mph 61 / 61°F 89% 1008 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 88%
Most Significant Cloud Type: medium
14%
0.0 In
14:00

NW
NW

 2 / 4 mph 67 / 67°F 43% 1021 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
20:00

ESE
ESE

 9 / 20 mph 61 / 61°F 94% 1006 mb
Low level cloud: 39%
Mid level cloud: 44%
High level cloud: 49%
Most Significant Cloud Type: low
60%
0.0 In
Fri 17
May		02:00

NW
NW

 3 / 7 mph 56 / 56°F 55% 1021 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 32%
Most Significant Cloud Type: medium
13%
0.0 In
08:00

SSW
SSW

 6 / 12 mph 62 / 62°F 98% 1010 mb
Low level cloud: 97%
Mid level cloud: 45%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.1 In
14:00

N
N

 3 / 7 mph 62 / 62°F 50% 1021 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 2%
Most Significant Cloud Type: medium
43%
0.0 In
20:00

WNW
WNW

 2 / 4 mph 74 / 77°F 86% 1012 mb
Low level cloud: 23%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
Sat 18
May		02:00

ENE
ENE

 5 / 11 mph 53 / 51°F 79% 1020 mb
Low level cloud: 37%
Mid level cloud: 51%
High level cloud: 80%
Most Significant Cloud Type: low
64%
0.0 In
08:00

SE
SE

 4 / 9 mph 64 / 64°F 91% 1014 mb
Low level cloud: 37%
Mid level cloud: 12%
High level cloud: 19%
Most Significant Cloud Type: low
43%
0.0 In
14:00

ENE
ENE

 11 / 23 mph 51 / 47°F 75% 1020 mb
Low level cloud: 73%
Mid level cloud: 31%
High level cloud: 91%
Most Significant Cloud Type: low
95%
0.0 In
20:00

SE
SE

 6 / 13 mph 67 / 67°F 92% 1011 mb
Low level cloud: 17%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.1 In
Sun 19
May		02:00

E
E

 13 / 28 mph 45 / 39°F 95% 1014 mb
Low level cloud: 78%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
08:00

NW
NW

 2 / 4 mph 64 / 64°F 84% 1008 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
0.0 In
14:00

ENE
ENE

 9 / 20 mph 56 / 53°F 53% 1014 mb
Low level cloud: 6%
Mid level cloud: 82%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
0.0 In
20:00

N
N

 3 / 6 mph 64 / 64°F 97% 1000 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
Mon 20
May		02:00

NNE
NNE

 7 / 15 mph 50 / 48°F 66% 1019 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
08:00

W
W

 9 / 19 mph 55 / 53°F 80% 1000 mb
Low level cloud: 1%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.6 In
14:00

N
N

 5 / 11 mph 64 / 64°F 41% 1022 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 15%
Most Significant Cloud Type: medium
30%
0.0 In
20:00

W
W

 10 / 20 mph 63 / 63°F 65% 1002 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 7%
Most Significant Cloud Type: medium
20%
0.0 In
Tue 21
May		02:00

NNW
NNW

 9 / 18 mph 51 / 47°F 66% 1025 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
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