United States · 1991–2020 normal
Collinsville in
September.
Typical September weather in Collinsville: 27.6°C by day, 13.9°C at night, 82 mm of rain over 5.4 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high27.6°C
Typical low13.9°C
Rain82 mm
Wet days5.4
Comfort score 77 this month, the highest of the year. Daylight is calculated as 12 h 23 from latitude 38.67°.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 4236191
- NOAA station
- USW00003960 · CAHOKIA ST LOUIS DWTN AP
- Station distance
- 18.5 km from the place centre
- Coverage
- Good coverage · 23 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.