Helena Weather: September
 |
Average Day Temperature: | 72.3°F |
|
Average Night Temperature: | 50.6°F |
|
Number of Sunny Days: | 21 days |
| Sunshine Hours: | 11.7 - 13.3 hours | |
|
Number of Rainy Days: | 1 day |
| Precipitation Totals: | 0.5 in | |
| detailed information | ||
14 day weather
forecast
forecast
| Helena |
Air Temperature in September, °F
The highest day temperature in September 2025 was 91°F. The lowest night temperature was 42°F. The average values for day and night temperatures during September were 75.6°F и 51.4°F respectivly.
Sunny, Cloudy and Gloomy days
Most of the days in September are sunny but you can also expect cloudy and gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Helena is 0.5 in.
Wind Speed in September, mph
The average wind speed in September is 4.7 mph. This value is relatively stable throughout the year.
Average Sunny Hours Per Day
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Helena in September is 9.6 hours.
Helena on the Weather Map
USA Resorts:
NAME
F°
| Boston |  |
+62 |
| Chicago |  |
+66 |
| Hawaii |  |
+80 |
| Las Vegas | |
+80 |
| Los Angeles | |
+72 |
| Maui |  |
+66 |
| Miami |  |
+88 |
| Myrtle Beach | |
+78 |
| New York | |
+66 |
| Panama City Beach | |
+90 |
| San Diego | |
+70 |
| San Francisco |  |
+60 |
| Santa Monica | |
+70 |
| Sarasota | |
+86 |
| Washington | |
+66 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Helena
Local time: 08:29
15 sep, tuesday
| 0900 |  |
46°F | SW 1 mph |
| 1200 |  |
58°F | S 4 mph |
| 1500 |  |
66°F | S 8 mph |
| 1800 | |
64°F | S 7 mph |
| 2100 | |
48°F | SE 4 mph |
16 sep, wednesday
| 0000 | |
44°F | E 3 mph |
| 0300 |  |
40°F | E 3 mph |
| 0600 | |
38°F | E 2 mph |