September weather forecast and climate
Harrisburg, IL

Average temperature in September - Harrisburg, IL
  • Average high temperature in September: 83°F

The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (41°F).

  • Average low temperature in September: 58°F

The month with the highest average low temperature is July (67°F).
Coldest months (with the lowest average low temperature) are January and February (26°F).

Average rainfall in September - Harrisburg, IL
  • Average rainfall in September: 3"

The wettest month (with the highest rainfall) is May (5.1").
The driest month (with the lowest rainfall) is January (2.8").

Average daylight in September - Harrisburg, IL
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.7h).
The month with shortest days is December (Average daylight: 9.6h).

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