Helsinki weather in May
May in Helsinki: cool, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Helsinki · #336 of 604 destinations to visit in May · comfort 80/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Helsinki climate normals — May
| Daytime high | 13°C / 55°F | 🙂 cool |
|---|---|---|
| Nighttime low | 6°C / 42°F | |
| Feels like (high) | 10°C / 50°F | |
| Rainfall | 62 mm / 2.4 in | 🌦 some rain |
| Rainy days | 11 days | |
| Humidity | 67% | 💧 humid |
| Dew point | 3°C / 38°F | |
| Sunshine | 12.3 h/day | |
| Daylight | 17.2 h | |
| Wind | 18 km/h / 11 mph | |
| Snowfall | 0.5 cm / 0.2 in | |
| Air quality (US AQI) | 48 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Helsinki in May — FAQ
- Is May a good time to visit Helsinki?
- May in Helsinki: cool, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Helsinki on SeasonMap's comfort score (80/100).
- What is the weather like in Helsinki in May?
- In May, Helsinki averages a daily high of 12.8°C and a low of 5.8°C, with about 61.9 mm of rain over roughly 11 rainy days.
- What is the air quality in Helsinki in May?
- Helsinki has a mean US Air Quality Index of about 48 in May.