Hanko Weather in September
September in Hanko averages 16°C (61°F) during the day and 13°C (55°F) at night. Quite a bit of rainfall is typical this month, with around 71 mm (2.8 in) on average. An umbrella is a good idea.
Rainfall in Hanko in September
Typically, you can expect about 16 days of rain this month, with 71 mm (2.8 in) on average. Rain is frequent but mostly light this month, with brief showers more common than heavy downpours.
Temperature in Hanko in September
Expect highs of 16°C (61°F) in Hanko in September, with nights dropping to around 13°C (55°F). The summer season is characteristic of September. Even when the weather is stable, mornings and evenings can still feel distinctly cool. Nights drop to around 13°C (55°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.If your ideal day consists of dry skies and pleasant temperatures, August typically offers the best circumstances for Hanko.
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 Hanko's climate page.
Hanko Temperature in September
Min Temperature
13°C (55°F)
Max Temperature
16°C (61°F)
Chance of Rain
53%
Precipitation
71 mm (2.8 in)
Rainy days
16 days
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Hanko typically drop from around 17°C (63°F) at the start of September to approximately 12°C (54°F) by the end. Nights are cool, with lows typically ranging from 8°C (46°F) to 13°C (55°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 Hanko in September
Browse day-by-day weather records for Hanko spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Hanko historical weather extremes in September
The extremes listed below come from historical weather data collected in Hanko from 1976 through 2025.
- On September 1, 2006, temperatures climbed to 22°C (72°F), marking the warmest September day on record.
- The lowest daytime temperature in September was 5°C (41°F), recorded on September 27, 1986.
- Nighttime temperatures dropped to 1°C (34°F) on September 26, 1986, marking the coldest September night on record.
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 Hanko in September
Pack for changing conditions in Hanko in September. Bring a mix of short and long sleeves, a warm layer like a hoodie or light jacket, and comfortable pants. The key is being able to add or remove layers as the days goes by. Rain gear is recommended, you can expect wet weather on multiple days.What To Do in Hanko 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 Hanko's climate page.
See the full Hanko climate overview or explore weather in Finland.
