Interlaken · AutumnMonth summary
Interlaken weather in September
✅ Good
🌡️ Temperature min / max
57°F – 70°F
🌧 Rainy days
50% of days
☀️ Sunshine
10.8h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.2/10
📅 📅 Best month
August (7.7/10)
Quick decision
Should you visit Interlaken in September?
✅ Good
✅ Yes if: you're willing to accept showers in exchange for lower prices and fewer tourists.
❌ No if: you're planning 100% outdoor activities — rain is frequent.
Our take: Favourable conditions in September (7.2/10). August scores higher but the gap is small.
By trip type
Interlaken in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ⚠️ Possible
- 🏖️ Beach / swimming : — No sea access
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
Autumn in Interlaken is often underrated: 21°F, golden light and declining crowds. An interesting window. With 50% of rainy days, always have indoor alternatives planned. Not the best window, but acceptable if dates are constrained. August (7.7/10) 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 | Ski score 🎿 |
|---|---|---|---|---|---|---|---|
| 🌦️ January | 34°F | 45°F | 54% | 0.2in | 7.2h | 2.8/10 | 6.5/10 |
| 🌦️ February | 36°F | 48°F | 45% | 0.1in | 8.3h | 4.1/10 | 6.2/10 |
| 🌦️ March | 37°F | 52°F | 47% | 0.2in | 10.1h | 4.5/10 | 5.8/10 |
| 🌦️ April | 43°F | 59°F | 50% | 0.2in | 11.9h | 6.1/10 | 4.7/10 |
| 🌧️ May | 48°F | 63°F | 66% | 0.3in | 11.7h | 5.8/10 | 4.1/10 |
| 🌦️ June | 57°F | 73°F | 56% | 0.2in | 13.1h | 7.4/10 | 3.8/10 |
| 🌦️ July | 61°F | 75°F | 60% | 0.2in | 13.6h | 7.4/10 | 3.6/10 |
| 🌤️ August | 61°F | 77°F | 49% | 0.2in | 12.7h | 7.7/10 | 3.8/10 |
| 🌦️ September | 57°F | 70°F | 50% | 0.2in | 10.8h | 7.2/10 | 3.9/10 |
| 🌦️ October | 50°F | 63°F | 42% | 0.2in | 9.3h | 7.0/10 | 4.2/10 |
| 🌦️ November | 41°F | 52°F | 47% | 0.2in | 7.0h | 4.1/10 | 5.2/10 |
| 🌦️ December | 36°F | 46°F | 46% | 0.2in | 6.9h | 3.8/10 | 6.2/10 |
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, Interlaken averages 70°F, 50% rainy days and 10.8h of sunshine per day. Overall weather score: 7.2/10.
See methodology →
Comparison
September vs August (best month)
The best month is August (score 7.7/10). Difference:
- 🌡️ Max temperature : +4°F
- 🌧 Rainy days : -1%
- ☀️ Sunshine : +1.9h/day
FAQ
FAQ — Interlaken in September
Is September a good time to visit Interlaken?
Yes, September is a good time (7.2/10). Great for outdoor activities and hiking.
Does it rain a lot in Interlaken in September?
Yes, 50% of days see rain in September. Plan some indoor activities as backup.
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