Lausanne Weather in September
September in Lausanne brings pleasant temperatures, with daytime highs of 20°C (68°F) and nights around 12°C (54°F). Quite a bit of rainfall is expected, around 117 mm (4.6 in), so pack an umbrella.
Rainfall in Lausanne in September
Records from the past 30 years suggest around 13 days of rain, with 117 mm (4.6 in) average for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Lausanne in September
September in Lausanne brings pleasant temperatures, with highs of 20°C (68°F) and nights around 12°C (54°F). Even when the weather is stable, mornings and evenings can still feel distinctly cool. At 12°C (54°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in Lausanne in September
The area experiences a moderate amount of sunshine, with approximately 185 hours of sunlight expected. This means a decent mix of sun and overcast.If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Switzerland, check out our Lausanne's climate page.
Lausanne Temperature in September
Min Temperature
12°C (54°F)
Max Temperature
20°C (68°F)
Chance of Rain
42%
Precipitation
117 mm (4.6 in)
Rainy days
13 days
Humidity
73%
Sunshine
185 hours
Percentage Sunshine
52%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Lausanne typically drop from around 22°C (72°F) at the start of September to approximately 18°C (64°F) by the end. Nights are cool, with lows typically ranging from 9°C (48°F) to 13°C (55°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Lausanne in September
Browse day-by-day weather records for Lausanne spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Lausanne historical weather extremes in September
Our historical data for Lausanne spans 1976 to 2025, revealing these weather extremes.
- Lausanne recorded its highest September temperature of 30°C (86°F) on September 13, 1987.
- The coldest September day was on September 24, 2002, with a maximum of 9°C (48°F).
- The coldest night in September in Lausanne was on September 16, 1988, with a minimum of 0°C (32°F).
- The heaviest September precipitation occurred on September 13, 2023, when 72 mm (2.8 in) of precipitation fell.
Best Places in Switzerland in September
Find out more about the weather in Switzerland and which places have the best travel conditions in this month. See all of Switzerland in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Lausanne in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Lausanne in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Switzerland, check out our Lausanne's climate page.
Temperature Rainfall Sunshine Humidity
See the full Lausanne climate overview or explore weather in Switzerland.
