Chicago Weather in May – Average Temperature and Rainfall
- High
- 18.7°
- Low
- 9.9°
- Rainfall
- 125 mm
- Rainy season
- 12d
- max
- 32.3°
- min
- -1.4°
May
- Early
- 15.6° 39.0 mm
- Mid
- 18.9° 43.3 mm
- Late
- 21.3° 43.1 mm
Summary
The climate figures for Chicago are averaged from 2016–2025 observations (10 years). Annual rainfall averages about 1,145 mm.
The rainy season runs May–October. The wettest month is July with 149.7 mm across 13 rain days; the driest is February at just 58.6 mm.
The hottest month is July (average high 27.1°C) and the coolest is January (0.2°C).
The most comfortable time to visit Chicago is February — less rain and milder heat.
Monthly averages
Common questions
Will it rain in Chicago today?
Yes. Rain is expected around 14:00–20:00, totalling roughly 2.3 mm.
How hot is it in Chicago today?
Between 5°C and 10°C, with a felt maximum of 8°C.
What is the weather in Chicago tomorrow?
Tomorrow: overcast, 3–9°C, with a 64% chance of rain.