Switzerland Lucerne Weather in September — Climate Guide
September in Lucerne is high
Lucerne Weather in September — Quick Answer
As of 2026- Avg temp
- 20° / 11°
- Rainfall
- 100mm · 11 days
- Crowds
- Busy
As of 2026, Lucerne in September averages a high of 20°C and low of 11°C with 100mm of rain over about 11 days. Mild early autumn — around 20°C/11°C with a wider day-night swing. Layers: a shirt with a light jacket or sweater for cooler evenings. UV 5 — sunglasses and SPF still useful.
September is high for Lucerne.
September is one of the best months to visit Lucerne — warm, settled days around 20°C/11°C, clearer and crisper air than midsummer, and the year's most reliable mountain views as the humidity drops. Crowds and prices ease back from the August peak.
All mountains are still running (the Pilatus cogwheel typically operates until around mid-October), the Lucerne Festival continues into early September, and the lake is still pleasant. Late in the month, the first autumn colour appears on the slopes.
Travel score
Lucerne September Weather Stats
Avg High
20°C
Avg Low
11°C
Rainy Days
11
100mm total
Sunshine
5.5h
Daily avg
Humidity
75%
comfortable
UV Index
5
Moderate
Wind
8 km/h
Gusts 18
Crowds
Busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
12 μg/m³
PM10
22 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
20°C
Nighttime
11°C
Humidity and wind affect how the actual temperature feels.
Wind
8 km/h
Max gust 18 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Crisp, clear days — best mountain views
- Eased crowds and prices vs August
- All mountains still running
- First autumn colour late in the month
Cons
- Cooler evenings (wider day-night swing)
- Still a popular, fairly priced month
- Daylight noticeably shortening
- Occasional early-autumn rain
September Events & Festivals
- Lucerne Festival continues (early September)
- Clearer, crisp days — excellent mountain views
- Autumn colour begins late in the month
- Pilatus cogwheel still running (until ~mid-Oct)
Lucerne in September — Full Picture
September is one of the best months to visit Lucerne — warm, settled days around 20°C/11°C, clearer and crisper air than midsummer, and the year's most reliable mountain views as the humidity drops. Crowds and prices ease back from the August peak.
All mountains are still running (the Pilatus cogwheel typically operates until around mid-October), the Lucerne Festival continues into early September, and the lake is still pleasant. Late in the month, the first autumn colour appears on the slopes.
The wider day-night swing means cooler evenings, so pack layers, but rainfall eases compared with summer. This is a connoisseur's month: great light for photography, fewer tour crowds, and full access to the mountains and cruises.
Note: it's still a popular month, so central hotels stay fairly priced rather than cheap — book the best-located places ahead.
What to Wear & What to Pack
Mild early autumn — around 20°C/11°C with a wider day-night swing. Layers: a shirt with a light jacket or sweater for cooler evenings. UV 5 — sunglasses and SPF still useful.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
14.3°C
4.3°C
12/mo
Summer (Jun·Jul·Aug)
24°C
13.3°C
13.7/mo
Autumn (Sep·Oct·Nov)
Current14°C
7°C
10.7/mo
Winter (Dec·Jan·Feb)
4°C
-1.3°C
10.7/mo
Lucerne Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 3° | -2° | 11d·60mm | 2h | 82% | 1 | Quiet | Low season | |
| 5° | -1° | 10d·55mm | 3h | 79% | 2 | Moderate | Shoulder | |
| 10° | 1° | 11d·65mm | 4h | 73% | 3 | Moderate | Shoulder | |
| 14° | 4° | 12d·80mm | 5h | 70% | 4 | Moderate | Shoulder | |
| 19° | 8° | 13d·110mm | 6h | 70% | 6 | Busy | Peak | |
| 23° | 12° | 14d·130mm | 6.5h | 70% | 7 | Busy | Peak | |
| July (Best) | 25° | 14° | 14d·130mm | 7h | 70% | 8 | Very busy | Peak |
| August (Best) | 24° | 14° | 13d·135mm | 6.5h | 72% | 7 | Very busy | Peak |
| September (Best) | 20° | 11° | 11d·100mm | 5.5h | 75% | 5 | Busy | Peak |
| 14° | 7° | 10d·85mm | 3.5h | 80% | 3 | Moderate | Shoulder | |
| 8° | 3° | 11d·80mm | 2h | 83% | 1 | Quiet | Low season | |
| 4° | -1° | 11d·70mm | 1.5h | 84% | 1 | Busy | Peak |
View Other Months
Lucerne September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Lucerne?
Lucerne in September is high. Tourist crowds are busy and flight/hotel prices are peak.
What's the average temperature in Lucerne in September?
Lucerne September averages a high of 20°C and a low of 11°C.
Does it rain much in Lucerne in September?
Lucerne September averages 100mm of rainfall over about 11 rainy days.
What should I wear in Lucerne in September?
Mild early autumn — around 20°C/11°C with a wider day-night swing. Layers: a shirt with a light jacket or sweater for cooler evenings. UV 5 — sunglasses and SPF still useful.
What time are sunrise and sunset in Lucerne in September?
Lucerne September sunrise is 07:05 and sunset is 19:35, with 12h 30min of daylight.
What's the air quality like in Lucerne in September?
Lucerne September air quality (AQI) averages 31, rated Good. PM2.5 averages 12μg/m³.
What activities are recommended in Lucerne in September?
In September, Lucerne is great for Mt. Pilatus Golden Round Trip (clear views), Mt. Rigi autumn hikes, Lake Lucerne cruises.
Is September peak season in Lucerne?
Lucerne September crowds are busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Lucerne
View Other Months
Planning a September trip to Lucerne?
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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.