Weather in Finland for September 2025

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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