Decatur weather in April 2026

Q: How warm is it in Decatur in April?

Daytime temperatures usually reach 15°C in Decatur in April, falling to 3°C at night.

Q: How sunny is it in Decatur in April?

There are normally 7 hours of bright sunshine each day in Decatur in April - that's 55% of daylight hours.

Q: Is the sea cold around Decatur in April?

The average sea temperature around Decatur in April is 3°C.

Q: Does it rain in Decatur in April?

There are usually 13 days with some rain in Decatur in April and the average monthly rainfall is 96mm.

Expect daytime maximum temperatures of 18°C in Decatur, Illinois in April based on long-term weather averages. There are 8 hours of sunshine per day on average with 12 days with some rainfall and typically 96 mm of rainfall in the month.

18
18°C max day temperature
8
8 hours of sunshine per day
12
12 days with some rainfall
5
5°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
96
96 mm of monthly rainfall
6
6 (High) UV index

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The April weather guide for Illinois (Decatur) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

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