Nykarleby Weather in September
What's the weather like in Nykarleby (Province of Western Finland) in September 2025?
The climate in Nykarleby during September can be summarized as cool and reasonably dry.
September is in the fall / autumn in Nykarleby and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 13°C (54°F), whilst at night 7°C (44°F) is normal.
| Daytime temperature | 12.5°C 54.4°F |
|---|---|
| Nightly temperature | 6.6°C 43.8°F |
| Average temperature | 9.5°C 49.1°F |
| Daily sunshine | 4 hrs |
| Avg rainfall | 59 mm 2.3 ins |
| Rainy days | 16 days |
| Sea temperature | 12.1°C 53.7°F |
| Humidity | 84% |
| Windspeed | 17.6kph 11 mph |
On average September is the wettest month of the year in Nykarleby with around 59mm 2.3 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 16 days, although this may vary considerably.
On the flip side this corresponds to an average of 4 hours of sunshine per day.
September temperatures in Nykarleby
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Nykarleby in September 2025.
Other monthly averages
Best places to visit in September
Nykarleby weather stats
| Hottest month: | July | 19.1°C 66.4°F |
|---|---|---|
| Driest month: | February | 21mm 0.8ins |
| Sunniest month: | June | 0hrs |
| Coldest month: | January | -5.4°C 22.3°F |
| Wettest month: | September | 59mm 2.3ins |
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