Hamilton weather in May
May in Hamilton: nice, rainy, with clean air — a great time to visit.
#5 of 12 months in Hamilton · #376 of 604 destinations to visit in May · comfort 78/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Hamilton climate normals — May
| Daytime high | 22°C / 71°F | 😎 nice |
|---|---|---|
| Nighttime low | 21°C / 69°F | |
| Feels like (high) | 23°C / 73°F | |
| Rainfall | 103 mm / 4 in | 🌧 rainy |
| Rainy days | 10 days | |
| Humidity | 83% | 💦 very humid |
| Dew point | 18°C / 65°F | |
| Sunshine | 11.5 h/day | |
| Daylight | 13.8 h | |
| Wind | 30 km/h / 18 mph | |
| Air quality (US AQI) | 42 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Hamilton in May — FAQ
- Is May a good time to visit Hamilton?
- May in Hamilton: nice, rainy, with clean air — a great time to visit. It ranks #5 of 12 months for Hamilton on SeasonMap's comfort score (78/100).
- What is the weather like in Hamilton in May?
- In May, Hamilton averages a daily high of 21.9°C and a low of 20.5°C, with about 102.7 mm of rain over roughly 9.8 rainy days.
- What is the air quality in Hamilton in May?
- Hamilton has a mean US Air Quality Index of about 42 in May.