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Monthly weather forecast in Boulder
30 days
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
30 days
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun
Sunday
Mon
Monday
Tue
Tuesday
Wed
Wednesday
Thu
Thursday
Fri
Friday
Sat
Saturday
18
+21
+14
18 August, sun
+21
+14
Feels like
+18
646 mmHg
37%
5.6
m/s
SE
18 August, Sunday. day, 21°; night, 14°; clear
19
+23
+15
19 August, mon
+23
+15
Feels like
+20
646 mmHg
37%
5.6
m/s
SE
19 August, Monday. day, 23°; night, 15°; rain
20
+23
+15
20 August, tue
+23
+15
Feels like
+19
647 mmHg
34%
5.5
m/s
S
20 August, Tuesday. day, 23°; night, 15°; clear
21
+23
+16
21 August, wed
+23
+16
Feels like
+20
647 mmHg
41%
6
m/s
S
21 August, Wednesday. day, 23°; night, 16°; clear
22
+22
+15
22 August, thu
+22
+15
Feels like
+19
647 mmHg
41%
5.8
m/s
SE
22 August, Thursday. day, 22°; night, 15°; clear
23
+22
+15
23 August, fri
+22
+15
Feels like
+19
648 mmHg
43%
5.6
m/s
S
23 August, Friday. day, 22°; night, 15°; partly cloudy
24
August
+30
+19
24 August, sat
+30
+19
Feels like
+23
630 mmHg
38%
4.3
m/s
W
Climate normal
+21
+15
24 August, Saturday. day, 30°; night, 19°; thunderstorm with rain
25
+28
+16
25 August, sun
+28
+16
Feels like
+22
633 mmHg
43%
5.6
m/s
W
Climate normal
+21
+16
25 August, Sunday. day, 28°; night, 16°; overcast
26
+28
+14
26 August, mon
+28
+14
Feels like
+22
633 mmHg
43%
4.1
m/s
E
Climate normal
+22
+15
26 August, Monday. day, 28°; night, 14°; light rain
27
+29
+17
27 August, tue
+29
+17
Feels like
+23
631 mmHg
40%
5.4
m/s
SE
Climate normal
+22
+16
27 August, Tuesday. day, 29°; night, 17°; mostly clear
28
+32
+16
28 August, wed
+32
+16
Feels like
+24
627 mmHg
33%
5.6
m/s
W
Climate normal
+22
+16
28 August, Wednesday. day, 32°; night, 16°; mostly clear
29
+27
+14
29 August, thu
+27
+14
Feels like
+17
631 mmHg
44%
4.7
m/s
E
Climate normal
+22
+16
29 August, Thursday. day, 27°; night, 14°; partly cloudy
30
+31
+18
30 August, fri
+31
+18
Feels like
+20
633 mmHg
40%
5.6
m/s
W
Climate normal
+21
+15
30 August, Friday. day, 31°; night, 18°; partly cloudy
31
+31
+17
31 August, sat
+31
+17
Feels like
+21
631 mmHg
35%
4.5
m/s
W
Climate normal
+22
+15
31 August, Saturday. day, 31°; night, 17°; light rain
1 September
+25
+15
1 September, sun
+25
+15
Feels like
+17
631 mmHg
54%
6.6
m/s
W
Climate normal
+22
+15
1 September, Sunday. day, 25°; night, 15°; rain
2
+26
+14
2 September, mon
+26
+14
Feels like
+18
631 mmHg
65%
4.7
m/s
W
Climate normal
+21
+14
2 September, Monday. day, 26°; night, 14°; rain
3
+26
+15
3 September, tue
+26
+15
Feels like
+17
628 mmHg
58%
4.7
m/s
W
Climate normal
+21
+13
3 September, Tuesday. day, 26°; night, 15°; mostly clear
4
+28
+16
4 September, wed
+28
+16
Feels like
+19
626 mmHg
52%
5.1
m/s
W
Climate normal
+20
+14
4 September, Wednesday. day, 28°; night, 16°; partly cloudy
5
+30
+9
5 September, thu
+30
+9
Feels like
+17
611 mmHg
44%
6.3
m/s
W
Climate normal
+19
+13
5 September, Thursday. day, 30°; night, 9°; light rain
6
+18
+9
6 September, fri
+18
+9
Feels like
+11
549 mmHg
54%
2.4
m/s
SW
Climate normal
+20
+13
6 September, Friday. day, 18°; night, 9°; partly cloudy
7
+15
+8
7 September, sat
+15
+8
Feels like
+10
548 mmHg
70%
3.4
m/s
W
Climate normal
+20
+12
7 September, Saturday. day, 15°; night, 8°; rain
8
+16
+6
8 September, sun
+16
+6
Feels like
+10
549 mmHg
71%
2.5
m/s
NW
Climate normal
+20
+13
8 September, Sunday. day, 16°; night, 6°; rain
9
+19
+7
9 September, mon
+19
+7
Feels like
+11
550 mmHg
58%
1.9
m/s
S
Climate normal
+19
+12
9 September, Monday. day, 19°; night, 7°; light rain
10
+18
+8
10 September, tue
+18
+8
Feels like
+10
549 mmHg
68%
2.1
m/s
S
Climate normal
+18
+11
10 September, Tuesday. day, 18°; night, 8°; rain
11
+15
+10
11 September, wed
+15
+10
Feels like
+9
547 mmHg
66%
2.4
m/s
SW
Climate normal
+17
+11
11 September, Wednesday. day, 15°; night, 10°; light rain
12
+19
+8
12 September, thu
+19
+8
Feels like
+10
548 mmHg
61%
2.2
m/s
SW
Climate normal
+18
+11
12 September, Thursday. day, 19°; night, 8°; rain
13
+19
+7
13 September, fri
+19
+7
Feels like
+10
548 mmHg
60%
2.5
m/s
W
Climate normal
+17
+11
13 September, Friday. day, 19°; night, 7°; light rain
14
+15
+6
14 September, sat
+15
+6
Feels like
+8
548 mmHg
68%
3.1
m/s
W
Climate normal
+16
+10
14 September, Saturday. day, 15°; night, 6°; rain
15
+15
+6
15 September, sun
+15
+6
Feels like
+7
548 mmHg
53%
3.3
m/s
NW
Climate normal
+18
+12
15 September, Sunday. day, 15°; night, 6°; light rain
16
+16
+5
16 September, mon
+16
+5
Feels like
+8
551 mmHg
40%
2.8
m/s
N
Climate normal
+18
+12
16 September, Monday. day, 16°; night, 5°; clear
17
+16
+4
17 September, tue
+16
+4
Feels like
+8
552 mmHg
43%
3.5
m/s
NE
Climate normal
+18
+11
17 September, Tuesday. day, 16°; night, 4°; clear
18
+18
+5
18 September, wed
+18
+5
Feels like
+9
550 mmHg
45%
2.6
m/s
NE
Climate normal
+19
+12
18 September, Wednesday. day, 18°; night, 5°; clear
19
+19
+8
19 September, thu
+19
+8
Feels like
+10
548 mmHg
37%
2.8
m/s
N
Climate normal
+19
+11
19 September, Thursday. day, 19°; night, 8°; clear
20
+19
+8
20 September, fri
+19
+8
Feels like
+8
547 mmHg
31%
4.7
m/s
W
Climate normal
+18
+12
20 September, Friday. day, 19°; night, 8°; clear
21
+20
+9
21 September, sat
+20
+9
Feels like
+10
548 mmHg
27%
2.9
m/s
W
Climate normal
+17
+11
21 September, Saturday. day, 20°; night, 9°; mostly clear
Average for 30 days
13
sunny days
12
days with precipitation
5
cloudy days
13 sunny days; 12 days with precipitation; 5 cloudy days;
49
%
air humidity
3.9
m/s
Wind
W
30
mm of precipitation
(6% of annual average)
air humidity 49%; 30 millimeters of precipitation (6% of annual average); Wind westerly 3.9 Meters per second
Forecast in graphs
Temperature
Humidity, %
Wind, m/s
Pressure, mmHg
W
W
E
SE
W
E
W
W
W
W
W
W
W
SW
W
NW
S
S
SW
SW
W
W
NW
N
NE
NE
N
W
W
W
24
Average data for 10 years
25
26
27
28
29
30
31
1
September
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Daytime temperature
Night-time temperature