What to pack for Helsinki in September
- long sleeves and a warm layer
- a medium jacket
- a compact umbrella or rain shell — rain is frequent
Humidity averages 80%; max daily wind around 22 km/h.
How September compares
Best months in Helsinki: June. See the full best time to visit Helsinki guide.
Helsinki in September: the details
In September, Helsinki sees average daytime highs of 15°C (60°F) and overnight lows of 10°C (50°F). Rainfall totals roughly 72 mm across 11.2 rainy days, and the sun shines about 8.6 hours per day with 12.5 hours of daylight mid-month. Relative humidity averages 80%.
In context: September is the 4th-warmest month and the 6th-wettest in Helsinki. The sunniest month is June (15.4 h/day).
| Metric | September average |
|---|---|
| Daytime high | 15°C / 60°F |
| Overnight low | 10°C / 50°F |
| Rainfall | 72 mm over 11.2 rainy days |
| Sunshine | 8.6 h/day (12.5 h daylight) |
| Humidity | 80% |
| Travel score | 7.4 / 10 |
These figures are climate normals computed from the ERA5 weather reanalysis (2019–2024) for Helsinki, Finland (60.17, 24.94) — see our methodology. Actual conditions vary year to year.
Not set on Helsinki? Browse the best places to visit in September ranked by travel score.
Frequently asked questions
How hot is Helsinki in September?
Daytime highs in Helsinki in September average 15°C (60°F); nights drop to about 10°C.
Does it rain in Helsinki in September?
Expect around 11.2 rainy days and 72 mm of rainfall in September.
Is September a good time to visit Helsinki?
September is a good month to visit Helsinki. Overall travel score: 7.4/10. The best months are June.
Also good in September, near Helsinki
Where should you go next month?
Get one email a month with the destinations at their seasonal best. Double opt-in, unsubscribe anytime.