September weather forecast
LaSalle, IL

Weather in September

The first month of the autumn, September, is still a warm month in LaSalle, Illinois, with average temperature varying between 77°F (25°C) and 52°F (11.1°C).

Temperature

In LaSalle, the average high-temperature in September slightly decreases, from 82.9°F (28.3°C) in August, to a still moderately hot 77°F (25°C). The average low-temperature, in September, is 52°F (11.1°C).

Daylight

The average length of the day in September in LaSalle is 12.5h.
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FAQ

What is the average length of the day in September in LaSalle?

In September, the average length of the day is 12.5h.

Average temperature in September
LaSalle, IL

Average temperature in September - LaSalle, IL
  • Average high temperature in September: 77°F

The warmest month (with the highest average high temperature) is July (85°F).
The month with the lowest average high temperature is January (30°F).

  • Average low temperature in September: 52°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (14°F).

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Average daylight in September
LaSalle, IL

Average daylight in September - LaSalle, IL
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.2h).

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