September weather forecast
LaSalle, IL

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Weather in September

September in LaSalle, Illinois brings about the start of fall. As the days begin shortening to an average of 12.5 hours, summer's warmth gradually declines, leading to the cooler days of autumn. Colors begin to shift from the vibrant greens of summer to an array of fall hues. September’s mild temperatures and gently decreasing daylight hours pave the way for the more significant changes approaching in October.

Temperature

September ushers in a minute temperature change in LaSalle, with average high-temperatures reducing from August's 82.9°F (28.3°C) to a still warm 77°F (25°C). During September, LaSalle reports a marked contrast from daily peak temperatures, with an average nighttime reading of 52°F (11.1°C).

Daylight

In LaSalle, the average length of the day in September is 12h and 28min.
On the first day of September in LaSalle, sunrise is at 6:23 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:39 pm CDT.
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Frequently asked questions

What are September temperatures in LaSalle?

September temperatures in LaSalle vary between a high-temperature of 77°F (25°C) and a low-temperature of 52°F (11.1°C).

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

In September, the average day length in LaSalle is 12h and 28min.

When are sunrise and sunset in September in LaSalle?

On the first day of September in LaSalle, Illinois, sunrise is at 6:23 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:39 pm CDT.

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: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).

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LaSalle, Illinois, USA

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