Helsinki · AutumnMonth summary
Helsinki weather in September
✅ Good
🌡️ Temperature min / max
52°F – 61°F
🌧 Rainy days
37% of days
☀️ Sunshine
8.9h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.0/10
📅 📅 Best month
June (7.6/10)
Quick decision
Should you visit Helsinki in September?
✅ Good
✅ Yes if: you want to explore the city on foot without suffering from heat.
❌ No if: you're looking for a beach destination — water and air are still cool.
Our take: September is a good time to visit Helsinki. June remains slightly better (+0.6 pts).
By trip type
Helsinki in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ⚠️ Possible
- 🏖️ Beach / swimming : ❌ Not recommended
- 💰 💰 Budget : 🌿 Shoulder
Local context
What to expect in September
Autumn in Helsinki is often underrated: 16°F, golden light and declining crowds. An interesting window. Expect rain on 37% of days — a light raincoat in the bag is recommended. Not the best window, but acceptable if dates are constrained. June (7.6/10) is significantly better if possible.
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Annual table
Month-by-month comparison
| Month | Min °F | Max °F | Rain % | Precip in | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌨️ January | 25°F | 32°F | 47% | 0.1in | 0.1h | 1.0/10 |
| 🌨️ February | 25°F | 34°F | 40% | 0.1in | 3.0h | 2.1/10 |
| 🌨️ March | 27°F | 36°F | 33% | 0.1in | 7.7h | 4.1/10 |
| 🌫️ April | 32°F | 45°F | 34% | 0.1in | 11.6h | 5.1/10 |
| ⛅ May | 43°F | 55°F | 29% | 0.1in | 15.0h | 7.1/10 |
| 🌤️ June | 54°F | 66°F | 35% | 0.1in | 16.6h | 7.6/10 |
| 🌤️ July | 57°F | 68°F | 41% | 0.1in | 15.1h | 7.6/10 |
| 🌤️ August | 57°F | 68°F | 44% | 0.1in | 12.5h | 7.3/10 |
| ⛅ September | 52°F | 61°F | 37% | 0.1in | 8.9h | 7.0/10 |
| 🌦️ October | 41°F | 50°F | 46% | 0.1in | 4.4h | 3.8/10 |
| 🌦️ November | 34°F | 41°F | 47% | 0.1in | 0.4h | 1.0/10 |
| 🌨️ December | 28°F | 36°F | 46% | 0.1in | 0.0h | 1.0/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Helsinki averages 61°F, 37% rainy days and 8.9h of sunshine per day. Overall weather score: 7.0/10.
See methodology →
Comparison
September vs June (best month)
The best month is June (score 7.6/10). Difference:
- 🌡️ Max temperature : +3°F
- 🌧 Rainy days : -2%
- ☀️ Sunshine : +7.7h/day
FAQ
FAQ — Helsinki in September
Is September a good time to visit Helsinki?
September is an acceptable time for Helsinki (score 7.0/10). Conditions are decent but not optimal — consider June (7.6/10) if possible.
What to do in Helsinki in September?
With 61°F max and 8.9h of sunshine, focus on cultural sites, museums and local gastronomy.
Accommodation
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Activities & tours
Activities and tours in Helsinki
Guided tours, skip-the-line tickets and local experiences.
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Explore also
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