Helsinki weather in October
October in Helsinki: cold, a little rain, with clean air — a good time to visit.
#7 of 12 months in Helsinki · #509 of 604 destinations to visit in October · comfort 62/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Helsinki climate normals — October
| Daytime high | 9°C / 48°F | 🧥 cold |
|---|---|---|
| Nighttime low | 6°C / 42°F | |
| Feels like (high) | 6°C / 43°F | |
| Rainfall | 74 mm / 2.9 in | 🌦 some rain |
| Rainy days | 16 days | |
| Humidity | 84% | 💦 very humid |
| Dew point | 4°C / 40°F | |
| Sunshine | 4.4 h/day | |
| Daylight | 10.1 h | |
| Wind | 21 km/h / 13 mph | |
| Snowfall | 0.6 cm / 0.2 in | |
| Air quality (US AQI) | 28 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Helsinki in October — FAQ
- Is October a good time to visit Helsinki?
- October in Helsinki: cold, a little rain, with clean air — a good time to visit. It ranks #7 of 12 months for Helsinki on SeasonMap's comfort score (62/100).
- What is the weather like in Helsinki in October?
- In October, Helsinki averages a daily high of 9.1°C and a low of 5.5°C, with about 74 mm of rain over roughly 15.6 rainy days.
- What is the air quality in Helsinki in October?
- Helsinki has a mean US Air Quality Index of about 28 in October.