Helsinki weather in August
August in Helsinki: nice, rainy, with clean air — an excellent time to visit.
#3 of 12 months in Helsinki · #164 of 604 destinations to visit in August · comfort 86/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Helsinki climate normals — August
| Daytime high | 20°C / 68°F | 😎 nice |
|---|---|---|
| Nighttime low | 14°C / 58°F | |
| Feels like (high) | 19°C / 66°F | |
| Rainfall | 82 mm / 3.2 in | 🌧 rainy |
| Rainy days | 13 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 14°C / 58°F | |
| Sunshine | 10.9 h/day | |
| Daylight | 15.6 h | |
| Wind | 18 km/h / 11 mph | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Helsinki in August — FAQ
- Is August a good time to visit Helsinki?
- August in Helsinki: nice, rainy, with clean air — an excellent time to visit. It ranks #3 of 12 months for Helsinki on SeasonMap's comfort score (86/100).
- What is the weather like in Helsinki in August?
- In August, Helsinki averages a daily high of 20°C and a low of 14.4°C, with about 81.7 mm of rain over roughly 12.6 rainy days.
- What is the air quality in Helsinki in August?
- Helsinki has a mean US Air Quality Index of about 38 in August.