United States · 1991–2020 normal
Helena in
September.
Typical September weather in Helena: 30.9°C by day, 18.5°C at night, 101 mm of rain over 6 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high30.9°C
Typical low18.5°C
Rain101 mm
Wet days6
Comfort score 59 this month (October leads the year at 81). Daylight is calculated as 12 h 20 from latitude 33.30°.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 4066811
- NOAA station
- USC00013781 · HELENA
- Station distance
- 2.8 km from the place centre
- Coverage
- Good coverage · 17 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.