Weather in Evanston: September
 |
Average day temperature: | 73.8°F |
| Average night temperature: | 64.5°F | |
 |
Sea water temperature: | 69.4°F |
 |
Number of sunny days: | 17 days |
| Day length: | 11.8 - 13.1 hours | |
 |
Number of rainy days: | 1 day |
| Precipitation totals: | 0.7 in. | |
| more information | ||
forecast
| Evanston |
temperature
| Evanston |
Air temperature in September, °F
The highest day temperature during September of 2025 was 86°F. At the same time the lowest night temperature was 52°F. Daily and nightly averages during September were 73.8°F and 62.9°F.
Sea water temperature in Evanston in September, °F
The average sea water temperature in September of 2025 was 69.6°F. The highest and lowest sea temperatures during the month were 72.0°F and 66.4°F.
Mostly all days in September are sunny but cloudy days are also possible.
Precipitation total in September, in.
Precipitation total value in Evanston in September is 0.7 in. Other months of the year show relatively similar values.
The average wind speed value in September is 8.3 mph It makes September one of the least windy months of the year.
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 8.7.
Best time for vacation in Evanston
Evanston on a weather map
11 mph
11 mph
11 mph
12 mph
13 mph
14 mph
15 mph
14 mph
