Average data for 10 years
1 September
Sunday
+21°
+14°
2 September
Monday
+19°
+12°
3 September
Tuesday
+19°
+12°
4 September
Wednesday
+16°
+11°
5 September
Thursday
+19°
+12°
6 September
Friday
+18°
+11°
7 September
Saturday
+18°
+11°
8 September
Sunday
+18°
+12°
9 September
Monday
+19°
+11°
10 September
Tuesday
+18°
+11°
11 September
Wednesday
+20°
+11°
12 September
Thursday
+17°
+10°
13 September
Friday
+16°
+9°
14 September
Saturday
+18°
+12°
15 September
Sunday
+18°
+11°
16 September
Monday
+17°
+10°
17 September
Tuesday
+17°
+10°
18 September
Wednesday
+17°
+10°
19 September
Thursday
+17°
+10°
20 September
Friday
+17°
+10°
21 September
Saturday
+15°
+10°
22 September
Sunday
+17°
+11°
23 September
Monday
+17°
+11°
24 September
Tuesday
+19°
+11°
25 September
Wednesday
+17°
+10°
26 September
Thursday
+16°
+10°
27 September
Friday
+17°
+11°
28 September
Saturday
+18°
+11°
29 September
Sunday
+15°
+9°
30 September
Monday
+14°
+8°
Cities near you
Canada
Medicine Hat
United States
Billings
Canada
Lethbridge
United States
Kalispell
United States
West Yellowstone
Cities with similar weather in September
Germany
Hamburg
Denmark
Copenhagen
Poland
Gdansk
United Kingdom
Looe
Austria
Salzburg
In September, the weather in Helena is typically warm. Average daily high temperature in September is about 17 degrees above zero. On average, Helena has 15 sunny, 10 partly cloudy, 4 rainy, and 1 cloudy day in September. The rains are usually moderate.