Chicago, Illinois weather in March

Averages from 2021–2025 (155 days of record).

Average high: 48°F
Average low: 33°F
Rainy days: ~12 per month
Total precipitation: 3.8 in
Warmest recorded: 76°F
Coldest recorded: 10°F

Expect March days in Chicago, Illinois to top out around 48°F and cool to about 33°F overnight, with roughly 12 days of measurable rain across the month. In recent years March has ranged from 10°F to 76°F.

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Current Chicago, Illinois forecast → · Historical data by Open-Meteo (ERA5).