Espoo Weather in September
September in Espoo brings moderate temperatures, with daytime highs of 16°C (61°F) and nights around 9°C (48°F). Quite a bit of rainfall is expected, around 65 mm (2.6 in), so pack an umbrella.
Rainfall in Espoo in September
Climate statistics over the past 30 years suggest around 18 days of rain, with 65 mm (2.6 in) average for the month. Rain is frequent but mostly light this month, with brief showers more common than heavy downpours.
Temperature in Espoo in September
In September, Espoo sees moderate temperatures, with highs of 16°C (61°F). Nights drop to around 9°C (48°F). This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. With overnight lows of 9°C (48°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Espoo in September
The area enjoys a moderate level of sunlight, with around 151 hours. It's a good balance between sunny and cloudy days.
Wind Speed in Espoo in September
Wind speeds average 3 m/s (6 knots) during September. At this speed, light breezes keep leaves and small twigs in gentle motion while the wind also provides natural cooling. Since this is an average, some days are more tranquil while others have more persistent light winds that are more noticeable.
Average water temperature in September
The water is 13°C (55°F) this month — cool enough to feel refreshing on a warm day, but cold enough that most people won't stay in for long without a wetsuit.Should you favor a climate that's both dry and comfortably warm, July and August typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
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 Espoo's climate page.
Espoo Temperature in September
Min Temperature
9°C (48°F)
Max Temperature
16°C (61°F)
Water Temperature
13°C (55°F) *
Chance of Rain
61%
Precipitation
65 mm (2.6 in)
Rainy days
18 days
Humidity
84% *
Windspeed
3 m/s (6 knots) *
Sunshine
151 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Espoo typically drop from around 17°C (63°F) at the start of September to approximately 12°C (54°F) by the end. Nights are cold, with lows typically ranging from 5°C (41°F) to 10°C (50°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 Espoo in September
Browse day-by-day weather records for Espoo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Espoo historical weather extremes in September
The extremes listed below come from historical weather data collected in Espoo from 1976 through 2025.
- The warmest day in September was on September 3, 2002, with a maximum of 25°C (77°F).
- On September 23, 2014, Espoo saw its coldest September day with temperatures maxing out at 5°C (41°F).
- The lowest overnight temperature recorded in September was -6°C (21°F) (September 30, 1993).
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 Espoo in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. With water temperatures around 13°C (55°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Espoo 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 Espoo's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Espoo climate overview or explore weather in Finland.
