Switzerland Swiss Alps Weather in September — Climate Guide
September in Swiss Alps is high
Swiss Alps Weather in September — Quick Answer
As of 2026- Avg temp
- 19° / 9°
- Rainfall
- 100mm · 11 days
- Crowds
- Busy
As of 2026, Swiss Alps in September averages a high of 19°C and low of 9°C with 100mm of rain over about 11 days. Mild early autumn (around 19°C/9°C) with crisp, often clear days. Layers and a warm jacket; windproof and gloves for the summits, which are turning colder.
September is high for Swiss Alps.
September is many people's favorite month in the Swiss Alps — and a strong recommendation. Valleys are mild (around 19°C/9°C), the air is crisp and clear, and the summer crowds thin out while prices ease from the peak.
The weather is often more settled than midsummer, with stable high-pressure spells giving clear views of the Matterhorn and the Jungfrau trio — the best odds for the summit railways. Hiking is at its finest: the trails are still fully open and far quieter.
Travel score
Swiss Alps September Weather Stats
Avg High
19°C
Avg Low
9°C
Rainy Days
11
100mm total
Sunshine
5.5h
Daily avg
Humidity
75%
comfortable
UV Index
5
Moderate
Wind
9 km/h
Gusts 22
Crowds
Busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
9 μg/m³
PM10
17 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
18°C
Nighttime
8°C
Humidity and wind affect how the actual temperature feels.
Wind
9 km/h
Max gust 22 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Clearer, more settled weather — best summit-view odds
- Fewer crowds than summer; easing prices
- Excellent hiking with trails still open
- Alpabzug cattle-descent festivals
Cons
- Cooler, and shortening days
- Some lifts/restaurants wind down late month
- Still popular — book ahead
- Cold summits
September Events & Festivals
- Excellent shoulder hiking — clear, stable autumn weather
- Alpine cattle descent (Alpabzug) festivals — decorated cows return from high pastures
- Thinning crowds after the summer peak
- Stable, settled high-pressure spells common
Swiss Alps in September — Full Picture
September is many people's favorite month in the Swiss Alps — and a strong recommendation. Valleys are mild (around 19°C/9°C), the air is crisp and clear, and the summer crowds thin out while prices ease from the peak.
The weather is often more settled than midsummer, with stable high-pressure spells giving clear views of the Matterhorn and the Jungfrau trio — the best odds for the summit railways. Hiking is at its finest: the trails are still fully open and far quieter.
A cultural highlight is the Alpabzug (Alpine cattle descent), when decorated cows are paraded down from the high pastures — colourful village festivals around the region. Lake boats still run, and early-autumn light is superb for photography.
Note: late September can turn cooler and lifts begin winding down toward the end of the month. It's arguably the best balance of weather, crowds, and cost — book ahead all the same. Verify current fares.
What to Wear & What to Pack
Mild early autumn (around 19°C/9°C) with crisp, often clear days. Layers and a warm jacket; windproof and gloves for the summits, which are turning colder.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
13.3°C
3.3°C
12.3/mo
Summer (Jun·Jul·Aug)
22.7°C
11.3°C
14/mo
Autumn (Sep·Oct·Nov)
Current13.7°C
5°C
10.7/mo
Winter (Dec·Jan·Feb)
4°C
-2.3°C
10.7/mo
Swiss Alps Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 3° | -3° | 11d·70mm | 2h | 82% | 1 | Busy | Peak | |
| 5° | -2° | 10d·65mm | 3h | 79% | 2 | Busy | Peak | |
| 9° | 0° | 11d·75mm | 4h | 74% | 3 | Moderate | Shoulder | |
| 13° | 3° | 12d·85mm | 5h | 71% | 4 | Quiet | Low season | |
| 18° | 7° | 14d·110mm | 5.5h | 71% | 5 | Moderate | Shoulder | |
| 21° | 10° | 14d·130mm | 6h | 71% | 6 | Busy | Peak | |
| July (Best) | 24° | 12° | 14d·145mm | 6.5h | 70% | 7 | Very busy | Peak |
| August (Best) | 23° | 12° | 14d·150mm | 6h | 73% | 6 | Very busy | Peak |
| 19° | 9° | 11d·100mm | 5.5h | 75% | 5 | Busy | Shoulder | |
| 14° | 5° | 10d·80mm | 4h | 78% | 3 | Moderate | Low season | |
| 8° | 1° | 11d·80mm | 2.5h | 82% | 1 | Quiet | Low season | |
| 4° | -2° | 11d·75mm | 2h | 83% | 1 | Busy | Peak |
View Other Months
Swiss Alps September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Swiss Alps?
Swiss Alps in September is high. Tourist crowds are busy and flight/hotel prices are shoulder.
What's the average temperature in Swiss Alps in September?
Swiss Alps September averages a high of 19°C and a low of 9°C.
Does it rain much in Swiss Alps in September?
Swiss Alps September averages 100mm of rainfall over about 11 rainy days.
What should I wear in Swiss Alps in September?
Mild early autumn (around 19°C/9°C) with crisp, often clear days. Layers and a warm jacket; windproof and gloves for the summits, which are turning colder.
What time are sunrise and sunset in Swiss Alps in September?
Swiss Alps September sunrise is 07:05 and sunset is 19:40, with 12h 35min of daylight.
What's the air quality like in Swiss Alps in September?
Swiss Alps September air quality (AQI) averages 29, rated Good. PM2.5 averages 9μg/m³.
What activities are recommended in Swiss Alps in September?
In September, Swiss Alps is great for Autumn hiking (best clear-view odds), Summit railways (Jungfraujoch, Gornergrat), Alpabzug festivals.
Is September peak season in Swiss Alps?
Swiss Alps September crowds are busy and prices are shoulder. Advance reservations are strongly recommended.
Best Months to Visit Swiss Alps
View Other Months
Planning a September trip to Swiss Alps?
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Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.