Decatur weather in March 2026

Q: How warm is it in Decatur in March?

Daytime temperatures usually reach 8°C in Decatur in March, falling to -2°C at night.

Q: How sunny is it in Decatur in March?

There are normally 6 hours of bright sunshine each day in Decatur in March - that's 50% of daylight hours.

Q: Is the sea cold around Decatur in March?

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

Q: Does it rain in Decatur in March?

There are usually 13 days with some rain in Decatur in March and the average monthly rainfall is 67mm.

Expect daytime maximum temperatures of 11°C in Decatur, Illinois in March based on long-term weather averages. There are 6 hours of sunshine per day on average with 12 days with some rainfall and typically 80 mm of rainfall in the month.

11
11°C max day temperature
6
6 hours of sunshine per day
12
12 days with some rainfall
-1
-1°C min night temperature
12
12 hours of daylight per day
0
No heat & humidity
80
80 mm of monthly rainfall
4
4 (Moderate) UV index

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The March 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)