Climate averages 1991–2020
Weather in Finland in September
In September, average daytime highs across the 13 cities listed in Finland range from 12.2°C in Oulu to 15.0°C in Turku. Monthly rainfall ranges from 51 mm in Lahti to 68 mm in Joensuu.
Long-term climate patterns, not a forecast for a particular trip.
City by city
September in Finland
| City | Average highHigh / low | Average low | Rainfall mm | Rain days |
|---|---|---|---|---|
| Helsinki | 14.6°C9.8°C | 9.8°C | 57 | 10.4 |
| Espoo | 14.5°C10.0°C | 10.0°C | 55 | 10.1 |
| Tampere | 13.5°C8.8°C | 8.8°C | 53 | 10.2 |
| Vantaa | 14.9°C9.0°C | 9.0°C | 57 | 10.4 |
| Oulu | 12.2°C7.5°C | 7.5°C | 56 | 10.4 |
| Turku | 15.0°C8.8°C | 8.8°C | 58 | 9.5 |
| Jyväskylä | 13.2°C8.1°C | 8.1°C | 54 | 10.5 |
| Kuopio | 12.6°C8.3°C | 8.3°C | 65 | 11.6 |
| Lahti | 14.1°C8.5°C | 8.5°C | 51 | 9.8 |
| Pori | 14.1°C9.4°C | 9.4°C | 62 | 10.2 |
| Joensuu | 12.4°C8.8°C | 8.8°C | 68 | 11.9 |
| Kouvola | 14.2°C8.4°C | 8.4°C | 53 | 9.9 |
| Lappeenranta | 13.9°C8.6°C | 8.6°C | 56 | 10.7 |
A rain day is a local calendar day with at least 1 mm of precipitation.