Helsinki · AutumnMonth summary
Helsinki weather in September
✅ Good
🌡️ Temperature min / max
11°C – 16°C
🌧 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: Favourable conditions in September (7.0/10). June scores higher but the gap is small.
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
🎯 Cultural sites less crowded than peak season — more enjoyable visits Autumn in Helsinki is often underrated: 16°C, 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 °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌨️ January | -4°C | 0°C | 47% | 2.2 | 0.1h | 1.0/10 |
| 🌨️ February | -4°C | 1°C | 40% | 2.1 | 3.0h | 2.1/10 |
| 🌨️ March | -3°C | 2°C | 33% | 1.4 | 7.7h | 4.1/10 |
| 🌫️ April | 0°C | 7°C | 34% | 1.6 | 11.6h | 5.1/10 |
| ⛅ May | 6°C | 13°C | 29% | 1.5 | 15.0h | 7.1/10 |
| 🌤️ June | 12°C | 19°C | 35% | 2.0 | 16.6h | 7.6/10 |
| 🌤️ July | 14°C | 20°C | 41% | 2.5 | 15.1h | 7.6/10 |
| 🌤️ August | 14°C | 20°C | 44% | 2.8 | 12.5h | 7.3/10 |
| ⛅ September | 11°C | 16°C | 37% | 2.4 | 8.9h | 7.0/10 |
| 🌦️ October | 5°C | 10°C | 46% | 2.8 | 4.4h | 3.8/10 |
| 🌦️ November | 1°C | 5°C | 47% | 2.6 | 0.4h | 1.0/10 |
| 🌨️ December | -2°C | 2°C | 46% | 2.2 | 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 16°C, 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°C
- 🌧 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 16°C max and 8.9h of sunshine, focus on cultural sites, museums and local gastronomy.
Accommodation
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Explore also
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