Weather in Finland for September 2025
In general, the average temperature in Finland at the beginning of September is 16.4 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 13.4 °C by the end of September.
Finland in September brings notable rainfall, with an average of 17 rainy days and a total precipitation of 64.1 mm.
Temperatures
Rain 🌧️
Finland Weather September
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  16° | 2 15° | 3 16° | 4  16° | 5  17° | 6  18° | 7 17° |
| 8  18° | 9 19° | 10 17° | 11 18° | 12  17° | 13  16° | 14 15° |
| 15 14° | 16 15° | 17 15° | 18 14° | 19 16° | 20 14° | 21 14° |
| 22 13° | 23 14° | 24 14° | 25 14° | 26 14° | 27 14° | 28 14° |
| 29 12° | 30 12° |
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Temperatures trend during September in Finland
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Patchy rain possible | 16° /10° | 2.3 mm | 4 | |
| 2 Sept. | Patchy rain possible | 15° /9° | 4.1 mm | 4 | |
| 3 Sept. | Patchy rain possible | 16° /10° | 0.8 mm | 4 | |
| 4 Sept. | Partly cloudy | 16° /9° | 0 mm | 4 | |
| 5 Sept. | Sunny | 17° /9° | 0.2 mm | 4 | |
| 6 Sept. | Overcast | 18° /9° | 0.4 mm | 5 | |
| 7 Sept. | Overcast | 17° /9° | 0 mm | 5 | |
| 8 Sept. | Cloudy | 18° /10° | 0 mm | 5 | |
| 9 Sept. | Overcast | 19° /11° | 0.2 mm | 5 | |
| 10 Sept. | Partly cloudy | 17° /11° | 0.6 mm | 5 | |
| 11 Sept. | Patchy rain possible | 18° /11° | 2.6 mm | 5 | |
| 12 Sept. | Moderate rain at times | 17° /12° | 0.9 mm | 4 | |
| 13 Sept. | Moderate rain | 16° /11° | 9.4 mm | 4 | |
| 14 Sept. | Partly cloudy | 15° /10° | 7.6 mm | 4 | |
| 15 Sept. | Overcast | 14° /8° | 2.9 mm | 4 | |
| 16 Sept. | Overcast | 15° /9° | 1.8 mm | 3 | |
| 17 Sept. | Overcast | 15° /9° | 1.9 mm | 4 | |
| 18 Sept. | Overcast | 14° /7° | 0.1 mm | 4 | |
| 19 Sept. | Overcast | 16° /8° | 0.5 mm | 4 | |
| 20 Sept. | Overcast | 14° /9° | 0.8 mm | 4 | |
| 21 Sept. | Cloudy | 14° /8° | 0 mm | 4 | |
| 22 Sept. | Cloudy | 13° /7° | 0 mm | 4 | |
| 23 Sept. | Overcast | 14° /8° | 3.8 mm | 3 | |
| 24 Sept. | Patchy rain possible | 14° /9° | 2.7 mm | 4 | |
| 25 Sept. | Overcast | 14° /9° | 1.5 mm | 4 | |
| 26 Sept. | Patchy rain possible | 14° /9° | 5.1 mm | 4 | |
| 27 Sept. | Sunny | 14° /9° | 4.4 mm | 4 | |
| 28 Sept. | Sunny | 14° /8° | 6.2 mm | 4 | |
| 29 Sept. | Patchy rain possible | 12° /8° | 2 mm | 4 | |
| 30 Sept. | Partly cloudy | 12° /7° | 1.4 mm | 4 | |
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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
September rainfall patterns in Finland
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