Vaasa Weather in September
Vaasa in September averages 15°C (59°F) during the day and 7°C (45°F) at night. Keep in mind that quite a bit of rainfall is expected this month.
Rainfall in Vaasa in September
Analyzing past climate data, one can expect approximately 16 days of rain, averaging 62 mm (2.4 in). Expect plenty of grey, overcast days rather than intense storms. The rain rarely amounts to much on any given day.
Temperature in Vaasa in September
September in Vaasa sees highs of 15°C (59°F) and lows of 7°C (45°F) overnight. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With overnight lows of 7°C (45°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Vaasa in September
The month brings about 135 hours of sunlight, offering a comfortable mix of sun and overcast.If your ideal day consists of dry skies and pleasant temperatures, July and August typically offer the best circumstances for Vaasa.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Finland, check out our Vaasa's climate page.
Vaasa Temperature in September
Min Temperature
7°C (45°F)
Max Temperature
15°C (59°F)
Chance of Rain
54%
Precipitation
62 mm (2.4 in)
Rainy days
16 days
Sunshine
135 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Vaasa typically drop from around 16°C (61°F) at the start of September to approximately 11°C (52°F) by the end. Nights are cold, with lows typically ranging from 4°C (39°F) to 9°C (48°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Vaasa in September
Browse day-by-day weather records for Vaasa spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Vaasa historical weather extremes in September
Based on 49 years of weather observations in Vaasa between 1976 and 2025, these are the recorded extremes.
- The warmest day in September was on September 1, 2019, with a maximum of 25°C (77°F).
- Vaasa experienced its chilliest September day on September 27, 1986, reaching only 4°C (39°F).
- The lowest overnight temperature recorded in September was -5°C (23°F) (September 30, 1978).
Best Places in Finland in September
Find out more about the weather in Finland and which places have the best travel conditions in this month. See all of Finland in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Vaasa in September
The weather can be unpredictable in September, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. Rain is likely on several days, so bring a good rain jacket. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Vaasa in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Finland, check out our Vaasa's climate page.
See the full Vaasa climate overview or explore weather in Finland.
