Chicago weather in March 2026

Q: How warm is it in Chicago in March?

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

Q: How sunny is it in Chicago in March?

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

Q: Is the sea cold around Chicago in March?

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

Q: Does it rain in Chicago in March?

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

Expect daytime maximum temperatures of 8°C in Chicago, Illinois in March based on long-term weather averages. There are 6 hours of sunshine per day on average with 13 days with some rainfall and typically 67 mm of rainfall in the month.

8
8°C max day temperature
6
6 hours of sunshine per day
13
13 days with some rainfall
-2
-2°C min night temperature
12
12 hours of daylight per day
0
No heat & humidity
67
67 mm of monthly rainfall
4
4 (Moderate) UV index
3
3°C sea temperature

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The March weather guide for Illinois (Chicago) 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)