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September weather forecast in Helena
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
1
+21
+14
1 September, sun
+21
+14
Feels like
+17
666 mmHg
41%
5.5
m/s
W
1 September, Sunday. day, 21°; night, 14°; clear
2
+19
+12
2 September, mon
+19
+12
Feels like
+16
667 mmHg
38%
5
m/s
NW
2 September, Monday. day, 19°; night, 12°; partly cloudy
3
+19
+12
3 September, tue
+19
+12
Feels like
+16
667 mmHg
43%
4.3
m/s
W
3 September, Tuesday. day, 19°; night, 12°; partly cloudy
4
+16
+11
4 September, wed
+16
+11
Feels like
+13
667 mmHg
49%
4.3
m/s
NW
4 September, Wednesday. day, 16°; night, 11°; rain
5
+19
+12
5 September, thu
+19
+12
Feels like
+15
667 mmHg
43%
4.5
m/s
W
5 September, Thursday. day, 19°; night, 12°; clear
6
+18
+11
6 September, fri
+18
+11
Feels like
+15
667 mmHg
46%
4.5
m/s
NW
6 September, Friday. day, 18°; night, 11°; clear
7
+18
+11
7 September, sat
+18
+11
Feels like
+15
667 mmHg
46%
5
m/s
W
7 September, Saturday. day, 18°; night, 11°; clear
8
+18
+12
8 September, sun
+18
+12
Feels like
+14
667 mmHg
47%
5.4
m/s
W
8 September, Sunday. day, 18°; night, 12°; partly cloudy
9
+19
+11
9 September, mon
+19
+11
Feels like
+15
668 mmHg
43%
5.3
m/s
NW
9 September, Monday. day, 19°; night, 11°; clear
10
+18
+11
10 September, tue
+18
+11
Feels like
+15
669 mmHg
43%
6
m/s
W
10 September, Tuesday. day, 18°; night, 11°; clear
11
+20
+11
11 September, wed
+20
+11
Feels like
+16
668 mmHg
40%
5
m/s
W
11 September, Wednesday. day, 20°; night, 11°; clear
12
+17
+10
12 September, thu
+17
+10
Feels like
+14
666 mmHg
46%
4.6
m/s
NW
12 September, Thursday. day, 17°; night, 10°; partly cloudy
13
+16
+9
13 September, fri
+16
+9
Feels like
+13
667 mmHg
54%
4
m/s
N
13 September, Friday. day, 16°; night, 9°; partly cloudy
14
+18
+12
14 September, sat
+18
+12
Feels like
+15
667 mmHg
51%
4.6
m/s
W
14 September, Saturday. day, 18°; night, 12°; partly cloudy
15
+18
+11
15 September, sun
+18
+11
Feels like
+15
667 mmHg
52%
4.5
m/s
W
15 September, Sunday. day, 18°; night, 11°; clear
16
+17
+10
16 September, mon
+17
+10
Feels like
+14
666 mmHg
52%
4.5
m/s
W
16 September, Monday. day, 17°; night, 10°; rain
17
+17
+10
17 September, tue
+17
+10
Feels like
+13
666 mmHg
54%
5.5
m/s
W
17 September, Tuesday. day, 17°; night, 10°; rain
18
+17
+10
18 September, wed
+17
+10
Feels like
+13
665 mmHg
47%
6.4
m/s
W
18 September, Wednesday. day, 17°; night, 10°; partly cloudy
19
+17
+10
19 September, thu
+17
+10
Feels like
+13
666 mmHg
49%
5.5
m/s
W
19 September, Thursday. day, 17°; night, 10°; clear
20
+17
+10
20 September, fri
+17
+10
Feels like
+13
666 mmHg
43%
4.8
m/s
W
20 September, Friday. day, 17°; night, 10°; partly cloudy
21
+15
+10
21 September, sat
+15
+10
Feels like
+11
666 mmHg
58%
4.6
m/s
W
21 September, Saturday. day, 15°; night, 10°; overcast
22
+17
+11
22 September, sun
+17
+11
Feels like
+13
666 mmHg
51%
4.8
m/s
W
22 September, Sunday. day, 17°; night, 11°; partly cloudy
23
+17
+11
23 September, mon
+17
+11
Feels like
+14
667 mmHg
47%
4.5
m/s
SW
23 September, Monday. day, 17°; night, 11°; partly cloudy
24
+19
+11
24 September, tue
+19
+11
Feels like
+15
666 mmHg
44%
5
m/s
W
24 September, Tuesday. day, 19°; night, 11°; rain
25
+17
+10
25 September, wed
+17
+10
Feels like
+13
667 mmHg
49%
5.8
m/s
W
25 September, Wednesday. day, 17°; night, 10°; clear
26
+16
+10
26 September, thu
+16
+10
Feels like
+13
669 mmHg
50%
4.6
m/s
W
26 September, Thursday. day, 16°; night, 10°; clear
27
+17
+11
27 September, fri
+17
+11
Feels like
+14
668 mmHg
46%
5
m/s
SW
27 September, Friday. day, 17°; night, 11°; clear
28
+18
+11
28 September, sat
+18
+11
Feels like
+14
666 mmHg
46%
4.4
m/s
SW
28 September, Saturday. day, 18°; night, 11°; clear
29
+15
+9
29 September, sun
+15
+9
Feels like
+11
665 mmHg
50%
5.4
m/s
W
29 September, Sunday. day, 15°; night, 9°; clear
30
+14
+8
30 September, mon
+14
+8
Feels like
+10
668 mmHg
52%
5
m/s
W
30 September, Monday. day, 14°; night, 8°; clear
1
+13
+8
1 October, tue
+13
+8
Feels like
+10
667 mmHg
56%
4.5
m/s
W
1 October, Tuesday. day, 13°; night, 8°; clear
2
+12
+6
2 October, wed
+12
+6
Feels like
+8
667 mmHg
56%
5.6
m/s
N
2 October, Wednesday. day, 12°; night, 6°; partly cloudy
3
+9
+4
3 October, thu
+9
+4
Feels like
+5
667 mmHg
69%
5
m/s
N
3 October, Thursday. day, 9°; night, 4°; rain
4
+9
+3
4 October, fri
+9
+3
Feels like
+5
667 mmHg
73%
4.9
m/s
W
4 October, Friday. day, 9°; night, 3°; partly cloudy
5
+11
+5
5 October, sat
+11
+5
Feels like
+7
666 mmHg
62%
6
m/s
W
5 October, Saturday. day, 11°; night, 5°; partly cloudy
Average data for 10 years
Helena September
15
sunny days
4
days with precipitation
11
cloudy days
15 sunny days; 4 days with precipitation; 11 cloudy days;
47
%
air humidity
3.5
m/s
Wind
W
42
mm of precipitation
(8% of annual average)
air humidity 47%; 42 millimeters of precipitation (8% of annual average); Wind westerly 3.5 Meters per second
Weather graphs for September
Temperature
Precipitation chance, %
Humidity, %
Wind, m/s
Pressure, mmHg
W
NW
W
NW
W
NW
W
W
NW
W
W
NW
N
W
W
W
W
W
W
W
W
W
SW
W
W
W
SW
SW
W
W
1
Average data for 10 years
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Daytime temperature
Night-time temperature
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