Weather in Finland for September 2025
In general, the average temperature in Finland at the beginning of September is 18.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.4 °C by the end of September.
The climate of Finland in September is notably wet, with an average of 13 rainy days.
Is September a good time to visit Finland? check out the best time to travel to Finland page.
- New! Chat with our AI weatherman - it’s amazing and free.
Finland in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  17° | 2 17° | 3 19° | 4  20° | 5 21° | 6  18° | 7  19° |
| 8 20° | 9  20° | 10 20° | 11 19° | 12 19° | 13  18° | 14 17° |
| 15 16° | 16 18° | 17 18° | 18 15° | 19 19° | 20 18° | 21 17° |
| 22 15° | 23 15° | 24 17° | 25 16° | 26 16° | 27 16° | 28  16° |
| 29 14° | 30 13° |
You can click on date
Temperatures trend during September in Finland
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Light rain shower | 17° /12° | 4.3 mm | 4 | |
| 2 Sept. | Light rain shower | 17° /12° | 7.4 mm | 4 | |
| 3 Sept. | Light rain shower | 19° /13° | 1.4 mm | 5 | |
| 4 Sept. | Cloudy | 20° /13° | 0 mm | 5 | |
| 5 Sept. | Patchy rain possible | 21° /13° | 0.3 mm | 5 | |
| 6 Sept. | Sunny | 18° /12° | 0 mm | 6 | |
| 7 Sept. | Partly cloudy | 19° /11° | 0 mm | 6 | |
| 8 Sept. | Cloudy | 20° /14° | 0 mm | 5 | |
| 9 Sept. | Overcast | 20° /14° | 0 mm | 5 | |
| 10 Sept. | Cloudy | 20° /14° | 1.2 mm | 5 | |
| 11 Sept. | Sunny | 19° /14° | 4.8 mm | 5 | |
| 12 Sept. | Sunny | 19° /14° | 0.1 mm | 5 | |
| 13 Sept. | Moderate rain | 18° /13° | 17 mm | 4 | |
| 14 Sept. | Overcast | 17° /11° | 11.1 mm | 4 | |
| 15 Sept. | Overcast | 16° /10° | 1.4 mm | 4 | |
| 16 Sept. | Overcast | 18° /11° | 0 mm | 4 | |
| 17 Sept. | Light rain shower | 18° /10° | 0.9 mm | 5 | |
| 18 Sept. | Overcast | 15° /8° | 0 mm | 4 | |
| 19 Sept. | Light rain shower | 19° /11° | 0.9 mm | 5 | |
| 20 Sept. | Light rain shower | 18° /11° | 1.6 mm | 5 | |
| 21 Sept. | Patchy rain possible | 17° /11° | 0 mm | 5 | |
| 22 Sept. | Sunny | 15° /10° | 0 mm | 5 | |
| 23 Sept. | Light rain shower | 15° /10° | 5.3 mm | 4 | |
| 24 Sept. | Patchy rain possible | 17° /12° | 0.6 mm | 5 | |
| 25 Sept. | Overcast | 16° /11° | 1.5 mm | 4 | |
| 26 Sept. | Patchy rain possible | 16° /12° | 10.1 mm | 4 | |
| 27 Sept. | Patchy rain possible | 16° /12° | 8.8 mm | 4 | |
| 28 Sept. | Mist | 16° /10° | 11.7 mm | 4 | |
| 29 Sept. | Partly cloudy | 14° /9° | 0.3 mm | 4 | |
| 30 Sept. | Light rain shower | 13° /8° | 1.7 mm | 4 | |
| Next | |||||
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.
Finland in September - FAQ
What to pack to Finland in September?
As you prepare for your trip to Finland in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Finland, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
Quick links
Where is Finland?Get accurate weather forecasts for Finland, located at latitude 60.17 and longitude 24.935. Stay updated with localized weather information tailored for Finland.