Naperville
Illinois, USA
Long-term weather forecast
Long-term weather forecast
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September weather forecast and Climate
Naperville, IL

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  • The average high temperature in September: 75°F

The warmest month (with the highest average high temperature) is July (83°F).
The month with the lowest average high temperature is January (30°F).

  • The average low temperature in September: 51°F

The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (15°F).

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  • The average rainfall in September: 3.6"

The wettest month (with the highest rainfall) is June (4.2").
Driest months (with the lowest rainfall) are January and February (1.7").

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