Early autumn · Weather & things to do
Helsinki in September
Helsinki cools off: highs slip to 59°F (15°C), from 66°F in August, with lows of 53°F (12°C) and about 2.5 in (63 mm) of rain.
It scores 76/100 for comfort, 4th of 12, which makes it a solid shoulder-season month.
- Avg high
- 59°F (15°C)
- Avg low
- 53°F (12°C)
- Rain
- 2.5 in (63 mm)
- Humidity
- 83%
- Cloud cover
- 67%
- Daylight
- ~12 h 31 min
- Comfort score
- 76/100 · Great
What September feels like
Expect mild afternoons around 59°F (15°C), good for long walks.
After dark, temperatures fall to about 53°F (12°C).
Showers are part of the month, adding up to about 2.5 in (63 mm).
Plan around September
September is shoulder season: good weather, a step below the best months (July & August).
- Comfort slips from 85/100 in August to 76/100.
- Our Rovaniemi, Saariselkä & Helsinki route is planned for Late Nov – Dec, a window set by the holiday season rather than the weather — September falls outside it.
What to pack for September
- A warm layer for eveningsnights drop to 53°F
- Packable rain jacket or umbrellaa shower or two is likely
- Comfortable walking shoesmost picks involve some walking
What to do in Helsinki in September
With conditions on your side, the picks below favor time outside.
Uspenski Cathedral
Red-brick Orthodox cathedral on a rocky hill above the harbour, with gilded onion domes.
Aleksanterinkatu Christmas Street
Helsinki's main shopping street, hung with Christmas lights every year since 1949.
Why now September scores 76/100 for comfort, good conditions for being outside.
Stockmann
Finland's largest department store, whose animated Christmas window display is unveiled each November.
Old Market Hall
Brick market hall from 1889 on the South Harbour, with stalls for salmon soup, smoked fish and Finnish pastries.
Löyly
Public sauna and restaurant in a timber-clad building on the Hernesaari shore, with steps down into the Baltic.
Nearby in September
- Tallinn in September~51 mi · highs 60°F, 2.2 in rain · similar daytime temperatures, about as wet
- Riga in September~225 mi · highs 62°F, 2.3 in rain · 2°C (3°F) warmer by day, about as wet
- Stockholm in September~246 mi · highs 62°F, 2.2 in rain · 2°C (3°F) warmer by day, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Helsinki in September: quick answers
Is September a good time to visit Helsinki?
It's a good shoulder-season choice, scoring 76/100 against a best of 86 in July & August. Expect highs of 59°F (15°C) and 2.5 in (63 mm) of rain.
How cold is Helsinki in September?
Average highs are 59°F (15°C) and average lows 53°F (12°C), making it the 4th-warmest month by daytime highs.
Does it rain a lot in Helsinki in September?
Some: about 2.5 in (63 mm) of rain falls across September on average, the 6th-wettest month of the year. The annual total is about 28.1 in (713 mm).
What should I pack for Helsinki in September?
Bring a warm layer for evenings (nights drop to 53°F), packable rain jacket or umbrella (a shower or two is likely) and comfortable walking shoes (most picks involve some walking).
More on Helsinki
Planning Helsinki in September?
Plan it together in TripsCircle: one itinerary, one shared packing list and costs split as you go.