Helsinki in September: a seasonal travel plan
Helsinki, Finland. In september, the average daytime high is 15.4 °C and the night-time low is 12.1 °C. Plan the main route in daylight and add an extra layer for early and late hours.
Choose a month
Selected month: September
Temperatures by month
Air temperature: Helsinki
Contents
Weather at a glance
- Daytime high
- 15.4 °C
- Nighttime low
- 12.1 °C
- Monthly precipitation
- 63.7 mm
- Days with at least 1 mm
- 10.8
- Daylight
- 13.0 h
2015–2024 averages. Daytime temperature is the average daily maximum; nighttime temperature is the average daily minimum.
Early, middle and late month
| Period | Daytime high, °C | Nighttime low, °C | Days with at least 1 mm |
|---|---|---|---|
| Days 1–10 | 17.0 | 13.4 | 3.5 |
| Days 11–20 | 15.3 | 12.1 | 4.1 |
| From day 21 | 13.9 | 10.8 | 3.2 |
What this month is like
Helsinki, Finland. In september, the average daytime high is 15.4 °C and the night-time low is 12.1 °C. Plan the main route in daylight and add an extra layer for early and late hours.
There are 10.8 wet days on average, with about 63.7 mm of precipitation. Keep an indoor backup route and a compact rain jacket in your day bag.
How to plan the day
Plan the main route in daylight and add an extra layer for early and late hours.
Average daylight is 13.0 hours, so put longer routes in the brighter part of the day.
What to pack
Pack a jacket or jumper, long trousers and closed shoes. Keep an indoor backup route and a compact rain jacket in your day bag.
Precipitation and an alternative plan
There are several days with precipitation during the month. A light waterproof layer can help you continue your route outdoors.
What to pack
Pack a light jacket, a jumper, long trousers and comfortable closed shoes. A compact rain jacket takes little room in a day bag.
Compared with neighbouring months
Average daytime high: previous month — 19.4 °C, September — 15.4 °C, next month — 9.4 °C. Days with at least 1 mm of precipitation: 11.7, 10.8 and 14.3.
Things to do
Helsinki occupies a granite peninsula on the Gulf of Finland, where wide avenues give way to rocky shorelines. The centre is walkable, trams link the harbour with Kallio, and ferries from Market Square cross to the island fortress.
Suomenlinna
The ferry from Market Square reaches the Suomenlinna fortress in about fifteen minutes. Walk the ramparts to the dry docks and bastions, then take a late ferry back when the wind drops.
Market Square and Esplanadi
Begin at Market Square, where stalls sell berries, fish and crafts in summer. The presidential palace stands by the harbour, and the Esplanadi park leads past the Design Museum to coffee on Kasarimikatu.
Töölö and the rock church
Temppeliaukio Church is cut into solid granite, and the room keeps an unusual quiet. From there walk to the Sibelius Monument and circle Töölönlahti bay, where the central Oodi library stands.
Where to stay
Kruununhaka
Kruununhaka sits beside Senate Square, the cathedral and the harbour, which makes it practical for a short stay. The buildings are historic and the streets quiet, though few cafés and bars stay open late.
Kallio
Kallio draws people for cheaper rooms, bars and a market where locals eat lunch. Trams reach the centre in about fifteen minutes; the district is lively, and weekends stay noisy until morning.
Punavuori
Punavuori and Ullanlinna hold design shops, galleries and coffee rooms in Jugend-style blocks. It is a good base for families and anyone who values quiet streets; Uunisaari beach is twenty minutes away on foot.
Getting to and around Helsinki
Helsinki-Vantaa airport connects to the central railway station by the I and P commuter trains on the ring line, a journey of about half an hour. Trams are the main way around the centre and reach Kallio and Töölö. One ticket covers trams, buses, trains and ferries within the zones, and the Suomenlinna ferry belongs to the city network.
Three days in Helsinki
Senate Square and the design district
Start at Senate Square and the white cathedral, look into Uspenski Cathedral and cross to Market Square. Walk the Esplanadi to the Design Museum in the afternoon and spend the evening in Punavuori.
Suomenlinna fortress
Take a morning ferry to Suomenlinna and follow the walls, docks and bastions around the island. Back in the city, climb to Kallio for dinner and a view over the roofs.
Töölö and Oodi library
Visit Temppeliaukio Church, then walk to the Sibelius Monument. Circle Töölönlahti bay and step into the Oodi library, which stays open late and has quiet seats upstairs, before finishing at Kiasma.
Weather throughout the year
| Month | Daytime high, °C | Nighttime low, °C | Precipitation, mm | Days with at least 1 mm | Daylight, h |
|---|---|---|---|---|---|
| January | -0.8 | -3.6 | 63.5 | 15.0 | 6.8 |
| February | -0.6 | -3.4 | 57.2 | 11.9 | 9.1 |
| March | 1.5 | -1.7 | 49.8 | 10.5 | 11.8 |
| April | 5.6 | 1.4 | 46.5 | 8.8 | 14.6 |
| May | 11.6 | 6.8 | 42.3 | 7.0 | 17.2 |
| June | 16.9 | 12.6 | 50.2 | 7.7 | 18.8 |
| July | 19.3 | 15.5 | 59.1 | 10.2 | 18.0 |
| August | 19.4 | 15.6 | 79.5 | 11.7 | 15.7 |
| September | 15.4 | 12.1 | 63.7 | 10.8 | 13.0 |
| October | 9.4 | 6.7 | 82.0 | 14.3 | 10.2 |
| November | 5.0 | 2.6 | 73.4 | 16.4 | 7.6 |
| December | 1.8 | -0.8 | 65.8 | 15.6 | 6.0 |
Frequently asked questions
Helsinki: what is the temperature in September?
The average daytime high is 15.4 °C and the night-time low is 12.1 °C. Fit the main walking route into daylight hours; bring an extra layer for the evening.
How many days with precipitation are there in September?
On average, there are 10.8 days with at least 1 mm of precipitation; the monthly total is 63.7 mm. There are several days with precipitation during the month. A light waterproof layer can help you continue your route outdoors.
What should I pack for walks in September?
Pack a light jacket, a jumper, long trousers and comfortable closed shoes. A compact rain jacket takes little room in a day bag.
How does the weather change from the start to the end of the month?
Average daytime highs by part of the month: 1–10 — 17.0 °C; 11–20 — 15.3 °C; 21 to month-end — 13.9 °C.
How many daylight hours are there in September?
The average is 13.0 hours. Spread walks between the morning and afternoon, then leave the evening for dinner or indoor activities.
Is Helsinki worth visiting in September?
The climate suits a trip if daytime temperatures around 15.4 °C and nights around 12.1 °C work for you. Plan the main route in daylight and add an extra layer for early and late hours.
What can I do in Helsinki on a wet day in September?
Keep an indoor backup route and a compact rain jacket in your day bag. Keep a museum, market, café or another indoor route near your accommodation.
What should I pack for Helsinki in September?
Pack a jacket or jumper, long trousers and closed shoes. Average daylight is 13.0 hours.