Decatur weather averages

Going to Decatur? Find the best month to visit Decatur based on the weather.

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Check Decatur weather averages before you book your next holiday in 2019/2020. Today's maximum temperature in Decatur is expected to be 25°C, while the average maximum temperature in April is 18°C.

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More about Decatur

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The weather for Decatur, Illinois shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by MeteoBlue. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

Decatur weather averages: best month

Decatur Best month Averages
Warmest July 31°C
Sunniest June & July 10 hours per day
Least rain August, September & October 8 days

Decatur climate guide

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Tropical storm risk: Decatur, Illinois hurricane season

% of month affected by tropical storms
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The Decatur, Illinois tropical storm risk chart above shows the hurricane season. The chart was processed from data supplied by the US Meteorological Agency (NOAA). Find out more about our data sources.

More about tropical storms

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Decatur weather averages by month

Check Decatur holiday weather averages for a particular month by selecting from the list below. Monthly weather guides include figures for temperature, rainfall, sunshine hours and sea temperature plus daily sunrise & sunset times.

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Compare Decatur weather with the USA

Below the Decatur weather chart shows maximum daytime temperature for Decatur, Illinois, USA and the USA (Washington). For more weather parameters or to change the destinations shown visit the comparison weather tool.

Maximum daytime temperature (°C)

Decatur, Illinois, USA
USA (Washington)
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Metric (°C / mm)  |  Imperial (°F / inches)

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