Chicago weather in May
May in Chicago: nice, rainy — an excellent time to visit.
#3 of 12 months in Chicago · #258 of 604 destinations to visit in May · comfort 83/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Chicago climate normals — May
| Daytime high | 18°C / 64°F | 😎 nice |
|---|---|---|
| Nighttime low | 10°C / 50°F | |
| Feels like (high) | 17°C / 63°F | |
| Rainfall | 124 mm / 4.9 in | 🌧 rainy |
| Rainy days | 13 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 9°C / 48°F | |
| Sunshine | 9.9 h/day | |
| Daylight | 14.6 h | |
| Wind | 21 km/h / 13 mph | |
| Air quality (US AQI) | 55 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Chicago in May — FAQ
- Is May a good time to visit Chicago?
- May in Chicago: nice, rainy — an excellent time to visit. It ranks #3 of 12 months for Chicago on SeasonMap's comfort score (83/100).
- What is the weather like in Chicago in May?
- In May, Chicago averages a daily high of 18°C and a low of 10.2°C, with about 124.3 mm of rain over roughly 12.6 rainy days.
- What is the air quality in Chicago in May?
- Chicago has a mean US Air Quality Index of about 55 in May.