Decatur
Illinois, USA
Long-term weather forecast
Long-term weather forecast

July weather forecast and climate
Decatur, IL

  • Average high temperature in July: 88°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (34°F).

  • Average low temperature in July: 64°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (16°F).

  • Average rainfall in July: 4.2"

The wettest month (with the highest rainfall) is July (4.2").
Driest months (with the lowest rainfall) are January and February (1.9").

  • Average rainfall days in July: 9 days

Months with the highest number of rainy days are March and April (12 days).
Months with the lowest number of rainy days are August, September and October (8 days).

  • Average daylight in July: 14.7h

The month with the longest days is June (Average daylight: 15h).
The month with shortest days is December (Average daylight: 9.4h).

  • Average sunshine in July: 10h

Months with most sunshine are June and July (Average sunshine: 10h).
Months with least sunshine are November and December (Average sunshine: 4).

  • Average UV index in July: 9

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January, November and December (UV index 2).

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