United States · 1991–2020 normal
River Forest in
September.
Typical September weather in River Forest: 24°C by day, 13.2°C at night, 81 mm of rain over 7 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high24°C
Typical low13.2°C
Rain81 mm
Wet days7
Comfort score 87 this month, the highest of the year. Daylight is calculated as 12 h 26 from latitude 41.90°. Open-water sea temperature is 20.1°C (16 km from the place centre).
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 4907637
- NOAA station
- USW00094846 · CHICAGO OHARE INTL AP
- Station distance
- 12 km from the place centre
- Coverage
- Strong coverage · 30 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.