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Groton 14 Day Long Range Forecast

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

Connecticut, United States Of America

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

For Groton in the coming two weeks the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 23°C expected on the afternoon of Sunday 19th. The average minimum temperature will be 10°C, dipping to its lowest on the morning of Friday 17th at 5°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. The indicators are that Monday 13th will have the most precipitation with an accumulation of around 6.0mm. On the whole winds are likely to be moderate. The forecast suggests the strongest wind will be on the morning of Monday 13th, coming from a north easterly direction, and reaching around 31mph.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 13
Oct		16:00

NE
NE

 27 / 31 mph 62 / 62°F 91% 1014 mb
Low level cloud: 97%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 25 / 29 mph 61 / 61°F 91% 1015 mb
Low level cloud: 93%
Mid level cloud: 22%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

 24 / 28 mph 59 / 59°F 91% 1015 mb
Low level cloud: 90%
Mid level cloud: 15%
High level cloud: 9%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 14
Oct		01:00

NE
NE

 24 / 38 mph 56 / 50°F 92% 1015 mb
Low level cloud: 96%
Mid level cloud: 16%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 23 / 39 mph 54 / 49°F 91% 1015 mb
Low level cloud: 91%
Mid level cloud: 16%
High level cloud: 2%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 22 / 34 mph 54 / 49°F 91% 1016 mb
Low level cloud: 92%
Mid level cloud: 83%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 20 / 23 mph 58 / 54°F 90% 1017 mb
Low level cloud: 88%
Mid level cloud: 62%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNE
NNE

 19 / 22 mph 61 / 61°F 84% 1016 mb
Low level cloud: 98%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNE
NNE

 17 / 19 mph 61 / 61°F 76% 1016 mb
Low level cloud: 84%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

 12 / 14 mph 59 / 59°F 70% 1016 mb
Low level cloud: 51%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 10 / 13 mph 57 / 55°F 70% 1016 mb
Low level cloud: 18%
Mid level cloud: 45%
High level cloud: 2%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 15
Oct		01:00

N
N

 8 / 16 mph 52 / 49°F 82% 1015 mb
Low level cloud: 5%
Mid level cloud: 22%
High level cloud: 1%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 9 / 18 mph 52 / 49°F 88% 1014 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

 9 / 18 mph 53 / 49°F 84% 1014 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 17%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

 12 / 14 mph 70 / 70°F 59% 1013 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 21%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 14 / 16 mph 72 / 76°F 54% 1012 mb
Low level cloud: 28%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

N
N

 18 / 21 mph 62 / 62°F 54% 1013 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
19:00

N
N

 16 / 27 mph 49 / 43°F 57% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 17 / 28 mph 45 / 38°F 60% 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
Thu 16
Oct		01:00

NNW
NNW

 13 / 20 mph 44 / 38°F 64% 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
04:00

NNW
NNW

 17 / 26 mph 44 / 37°F 62% 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
07:00

NNW
NNW

 16 / 23 mph 43 / 36°F 63% 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
10:00

N
N

 17 / 20 mph 53 / 47°F 46% 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
13:00

N
N

 17 / 20 mph 60 / 59°F 35% 1013 mb
Low level cloud: 0%
Mid level cloud: 1%
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

N
N

 15 / 17 mph 59 / 56°F 38% 1014 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
19:00

N
N

 14 / 23 mph 49 / 44°F 50% 1016 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

N
N

 14 / 22 mph 45 / 39°F 58% 1016 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
Fri 17
Oct		01:00

NNW
NNW

 11 / 21 mph 43 / 36°F 64% 1016 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
04:00

NNW
NNW

 13 / 23 mph 42 / 35°F 65% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 47%
Most Significant Cloud Type: high
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

 12 / 20 mph 44 / 38°F 61% 1017 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 49%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

 12 / 14 mph 56 / 52°F 44% 1017 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 2%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

N
N

 11 / 12 mph 62 / 62°F 37% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 9%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 9 / 10 mph 63 / 62°F 42% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 31%
Most Significant Cloud Type: high
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 7 / 11 mph 54 / 52°F 54% 1015 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 17%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 7 / 14 mph 49 / 46°F 60% 1015 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 7%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
Oct		01:00

N
N

 6 / 12 mph 47 / 44°F 61% 1015 mb
Low level cloud: 0%
Mid level cloud: 62%
High level cloud: 13%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 4 / 8 mph 49 / 48°F 54% 1015 mb
Low level cloud: 0%
Mid level cloud: 81%
High level cloud: 96%
Most Significant Cloud Type: medium
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 4 / 6 mph 51 / 51°F 54% 1016 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 65%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 4 / 5 mph 55 / 54°F 53% 1016 mb
Low level cloud: 18%
Mid level cloud: 80%
High level cloud: 35%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 6 / 7 mph 63 / 62°F 51% 1014 mb
Low level cloud: 8%
Mid level cloud: 23%
High level cloud: 26%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SW
SW

 5 / 6 mph 63 / 62°F 58% 1014 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 18%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

 7 / 12 mph 59 / 59°F 67% 1014 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 21%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

 7 / 13 mph 59 / 58°F 76% 1014 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 16%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
Oct		01:00

SW
SW

 7 / 15 mph 56 / 55°F 84% 1014 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

 6 / 13 mph 56 / 54°F 87% 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
07:00

S
S

 7 / 14 mph 58 / 56°F 91% 1013 mb
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 10 / 12 mph 72 / 76°F 78% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 13 / 15 mph 74 / 77°F 76% 1011 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 4%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 13 / 15 mph 70 / 70°F 83% 1010 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 20%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 15 / 17 mph 67 / 67°F 88% 1010 mb
Low level cloud: 10%
Mid level cloud: 27%
High level cloud: 69%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 17 / 20 mph 70 / 70°F 88% 1009 mb
Low level cloud: 45%
Mid level cloud: 67%
High level cloud: 98%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 20
Oct		01:00

SE
SE

 4 / 6 mph 59 / 59°F 66% 1015 mb
Low level cloud: 0%
Mid level cloud: 39%
High level cloud: 98%
Most Significant Cloud Type: medium
42%
0.0 In
07:00

SSW
SSW

 21 / 44 mph 58 / 55°F 96% 1009 mb
Low level cloud: 95%
Mid level cloud: 50%
High level cloud: 65%
Most Significant Cloud Type: low
100%
0.0 In
13:00

WSW
WSW

 17 / 31 mph 62 / 62°F 60% 999 mb
Low level cloud: 58%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
74%
0.0 In
19:00

W
W

 13 / 28 mph 62 / 62°F 95% 1007 mb
Low level cloud: 93%
Mid level cloud: 46%
High level cloud: 18%
Most Significant Cloud Type: low
100%
0.0 In
Tue 21
Oct		01:00

NW
NW

 12 / 21 mph 46 / 40°F 82% 1009 mb
Low level cloud: 15%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
22%
0.0 In
07:00

WNW
WNW

 9 / 15 mph 48 / 44°F 81% 1007 mb
Low level cloud: 43%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.0 In
13:00

W
W

 15 / 28 mph 58 / 55°F 58% 1004 mb
Low level cloud: 53%
Mid level cloud: 98%
High level cloud: 14%
Most Significant Cloud Type: low
89%
0.0 In
19:00

WNW
WNW

 13 / 23 mph 57 / 53°F 68% 1011 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 22%
Most Significant Cloud Type: medium
29%
0.0 In
Wed 22
Oct		01:00

W
W

 10 / 19 mph 52 / 49°F 76% 1006 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 16%
Most Significant Cloud Type: medium
11%
0.0 In
07:00

WNW
WNW

 9 / 15 mph 51 / 48°F 85% 1013 mb
Low level cloud: 52%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
60%
0.0 In
13:00

ENE
ENE

 6 / 12 mph 58 / 57°F 91% 1003 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
19:00

NW
NW

 9 / 17 mph 53 / 50°F 75% 1012 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 21%
Most Significant Cloud Type: medium
13%
0.0 In
Thu 23
Oct		01:00

E
E

 8 / 16 mph 55 / 52°F 92% 999 mb
Low level cloud: 40%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: low
75%
0.2 In
07:00

NNW
NNW

 7 / 12 mph 51 / 48°F 78% 1011 mb
Low level cloud: 0%
Mid level cloud: 51%
High level cloud: 0%
Most Significant Cloud Type: medium
51%
0.0 In
13:00

NNW
NNW

 9 / 19 mph 58 / 56°F 89% 1001 mb
Low level cloud: 91%
Mid level cloud: 88%
High level cloud: 19%
Most Significant Cloud Type: low
100%
0.5 In
19:00

N
N

 10 / 18 mph 55 / 52°F 62% 1012 mb
Low level cloud: 47%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
Fri 24
Oct		01:00

WNW
WNW

 12 / 25 mph 53 / 49°F 87% 1005 mb
Low level cloud: 78%
Mid level cloud: 15%
High level cloud: 4%
Most Significant Cloud Type: low
83%
0.0 In
07:00

NNW
NNW

 9 / 15 mph 47 / 43°F 85% 1016 mb
Low level cloud: 1%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
13:00

WNW
WNW

 15 / 32 mph 59 / 56°F 59% 1005 mb
Low level cloud: 35%
Mid level cloud: 35%
High level cloud: 47%
Most Significant Cloud Type: low
53%
0.0 In
19:00

N
N

 6 / 10 mph 58 / 57°F 61% 1017 mb
Low level cloud: 67%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
68%
0.0 In
Sat 25
Oct		01:00

W
W

 11 / 23 mph 55 / 52°F 74% 1005 mb
Low level cloud: 0%
Mid level cloud: 86%
High level cloud: 5%
Most Significant Cloud Type: medium
86%
0.0 In
07:00

NNW
NNW

 6 / 11 mph 51 / 49°F 76% 1017 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

W
W

 15 / 30 mph 63 / 63°F 60% 1003 mb
Low level cloud: 19%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
19:00

SW
SW

 3 / 6 mph 62 / 62°F 65% 1017 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: medium
9%
0.0 In
Sun 26
Oct		01:00

W
W

 13 / 28 mph 53 / 49°F 72% 1009 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
07:00

ESE
ESE

 8 / 13 mph 55 / 53°F 72% 1018 mb
Low level cloud: 0%
Mid level cloud: 78%
High level cloud: 80%
Most Significant Cloud Type: medium
81%
0.0 In
13:00

SSW
SSW

 13 / 28 mph 63 / 63°F 63% 1010 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
19:00

ESE
ESE

 21 / 38 mph 60 / 60°F 90% 1015 mb
Low level cloud: 98%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
Mon 27
Oct		01:00

SSE
SSE

 19 / 40 mph 64 / 64°F 83% 1007 mb
Low level cloud: 12%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
78%
0.0 In
07:00

ENE
ENE

 27 / 50 mph 53 / 46°F 92% 1011 mb
Low level cloud: 100%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.3 In
13:00

WSW
WSW

 15 / 32 mph 61 / 61°F 57% 1005 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.1 In
19:00

NE
NE

 23 / 43 mph 55 / 50°F 90% 1010 mb
Low level cloud: 97%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
Tue 28
Oct		01:00

W
W

 15 / 31 mph 49 / 43°F 72% 1009 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

 25 / 52 mph 45 / 36°F 88% 1007 mb
Low level cloud: 96%
Mid level cloud: 61%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
13:00

WSW
WSW

 14 / 30 mph 56 / 53°F 55% 1011 mb
Low level cloud: 6%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
10%
0.0 In
19:00

N
N

 19 / 39 mph 51 / 44°F 89% 1005 mb
Low level cloud: 98%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
100%
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