Weather in Finland for September 2025
Snowfall in Finland during September is quite rare, with fewer than 2 snowy days on average.
In general, the average temperature in Finland at the beginning of September is 13.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 9.4 °C by the end of September.
Finland in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 64.4 mm.
Snow Forecast ❄️
Temperatures
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Finland in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  11° | 2 12° | 3  13° | 4  13° | 5 15° | 6 14° | 7 14° |
| 8  15° | 9  16° | 10  16° | 11 14° | 12 15° | 13  11° | 14 10° |
| 15 10° | 16  10° | 17 11° | 18 10° | 19 11° | 20 9° | 21 7° |
| 22 10° | 23 10° | 24 10° | 25 10° | 26 11° | 27 9° | 28 10° |
| 29 9° | 30 7° |
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Temperatures trend during September in Finland
September weather day by day
| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| 1 Sept. | Moderate rain at times | 11° /7° | 7.5 mm | 0 cm | |
| 2 Sept. | Moderate rain at times | 12° /6° | 3 mm | 0 cm | |
| 3 Sept. | Light rain shower | 13° /6° | 1.3 mm | 0 cm | |
| 4 Sept. | Overcast | 13° /6° | 3.2 mm | 0 cm | |
| 5 Sept. | Overcast | 15° /7° | 1.2 mm | 0 cm | |
| 6 Sept. | Overcast | 14° /6° | 0.1 mm | 0 cm | |
| 7 Sept. | Overcast | 14° /6° | 1.5 mm | 0 cm | |
| 8 Sept. | Fog | 15° /7° | 0.7 mm | 0 cm | |
| 9 Sept. | Partly cloudy | 16° /7° | 0.4 mm | 0 cm | |
| 10 Sept. | Sunny | 16° /8° | 0 mm | 0 cm | |
| 11 Sept. | Overcast | 14° /7° | 0.4 mm | 0 cm | |
| 12 Sept. | Overcast | 15° /7° | 0.4 mm | 0 cm | |
| 13 Sept. | Heavy rain at times | 11° /5° | 4.9 mm | 0 cm | |
| 14 Sept. | Moderate or heavy rain shower | 10° /4° | 5.7 mm | 0 cm | |
| 15 Sept. | Overcast | 10° /4° | 1.7 mm | 0 cm | |
| 16 Sept. | Cloudy | 10° /4° | 0.6 mm | 0 cm | |
| 17 Sept. | Overcast | 11° /4° | 2.7 mm | 0 cm | |
| 18 Sept. | Overcast | 10° /4° | 0.2 mm | 0 cm | |
| 19 Sept. | Overcast | 11° /5° | 5.8 mm | 0 cm | |
| 20 Sept. | Sunny | 9° /2° | 2.2 mm | 0 cm | |
| 21 Sept. | Overcast | 7° /1° | 1.3 mm | 0.2 cm | |
| 22 Sept. | Overcast | 10° /3° | 0.1 mm | 0 cm | |
| 23 Sept. | Patchy rain possible | 10° /5° | 2.2 mm | 0 cm | |
| 24 Sept. | Patchy rain possible | 10° /4° | 3 mm | 0 cm | |
| 25 Sept. | Patchy rain possible | 10° /5° | 5.3 mm | 0 cm | |
| 26 Sept. | Partly cloudy | 11° /5° | 2 mm | 0 cm | |
| 27 Sept. | Patchy rain possible | 9° /5° | 5 mm | 0 cm | |
| 28 Sept. | Cloudy | 10° /4° | 0.7 mm | 0 cm | |
| 29 Sept. | Overcast | 9° /3° | 0.4 mm | 0 cm | |
| 30 Sept. | Overcast | 7° /3° | 1 mm | 0 cm | |
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Guide for Finland in September
In September, Finland experiences a transition from late summer to early autumn, bringing about noticeable changes in the weather. At the beginning of the month, southern Finland typically enjoys mild temperatures with occasional showers.
Helsinki, for example, can expect temperatures around 15° at the start of September, with a mix of sunny and cloudy days. As the month progresses, the temperatures gradually begin to drop, and by the end of September, the weather becomes noticeably cooler.
In the northern regions, such as Rovaniemi, the temperatures at the beginning of the month hover around 10°, and by the end of September, they can drop to around 5°. The autumn foliage starts to appear, creating picturesque landscapes across the country.
September also marks the beginning of the aurora borealis season in Lapland, offering a chance to witness the mesmerizing Northern Lights as the nights grow longer.
It's important to note that the weather in Finland can be quite unpredictable, so it's advisable to pack layers and be prepared for sudden changes.
Overall, September in Finland offers a beautiful transition from the warmth of summer to the crispness of autumn, making it an ideal time to explore the country's natural beauty.
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Finland in September - FAQ
Finland snow forecast September 2025
September rainfall patterns in Finland
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