September · typical climate, not a forecast
Helsinki in September
Finland
Solid escape
16°C day · 11°C night · 36% rain · 13h daylight · moderate crowds · €980 estimated
Live · Helsinki
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Live · Tallinn (you)
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Cool Score breakdown
Scored for 5 nights from Tallinn in September.
- Temperature fit100
16°C typical high vs your 12–20°C window
w 26 - Heat escape3
0.3°C cooler than Tallinn
w 14 - Rain probability81
36% chance of rain on an average day
w 11 - Daylight hours61
12.5h of daylight mid-month
w 8 - Outdoor conditions84
Comfortable for a full day outside at 16°C
w 10 - Crowding59
Moderate crowds for this month
w 8 - Flight + stay cost87
≈€980 estimated for 5 nights vs €1000 budget
w 12 - Nature access70
7/10 — wild ground within reach
w 6 - City atmosphere90
9/10 urban texture · 9/10 food scene
w 4
Why Helsinki in September
Baltic water keeps the evenings brisk even in a warm week.
- Island saunas
- Design district
- Archipelago ferries
What September in Helsinki is actually like
In September, Helsinki sits around 16°C by day and drops to about 11°C after dark, so a light layer earns its place in the bag even in high summer. That is roughly 0°C cooler than Tallinn at the same time of year — the difference between planning your day around the shade and simply walking out of the door.
Expect rain on roughly 36% of days, usually passing rather than persistent, and about 13 hours of daylight to spend outside. Crowds are moderate crowds this month, and a 5-night trip from Tallinn works out at around €980 including flights, a mid-range stay and everyday spending.
Baltic water keeps the evenings brisk even in a warm week. Days here tend to fill up with island saunas, design district, archipelago ferries — which is why Helsinki scores 72 out of 100 for september: solid escape.
Other months
Compare the typical climate month by month.