Monthly climate guide
Lausanne weather in September
September in Lausanne is typically mild, with average daytime highs around 18°C (65°F) and night-time lows near 9°C (48°F). The month usually brings about 77 mm of rain (some rain) and is often cloudy. Daytime highs are 4°C cooler than August and 5°C warmer than October.
What stands out in September
- Just 50 km apart, but Lausanne runs about 2°C cooler than Geneva this month.
- Skies are at their clearest this time of year.
- It cools down fast from here: October is about 4°C cooler.
- September brings early autumn to Lausanne.
Avg high
18°C
65°F
Avg low
9°C
48°F
Rainfall
77 mm
some rain
Humidity
75%
relative
Sky
58%
cloud · often cloudy
Lausanne weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 2°C / 35°F | -5°C / 23°F | 99 mm | 86% | 77% |
| February | 3°C / 37°F | -5°C / 23°F | 72 mm | 84% | 73% |
| March | 8°C / 46°F | -1°C / 30°F | 70 mm | 80% | 66% |
| April | 12°C / 54°F | 3°C / 37°F | 81 mm | 77% | 67% |
| May | 15°C / 59°F | 6°C / 42°F | 137 mm | 79% | 71% |
| June | 19°C / 67°F | 11°C / 51°F | 122 mm | 77% | 66% |
| July | 22°C / 71°F | 13°C / 55°F | 118 mm | 73% | 58% |
| August | 22°C / 72°F | 12°C / 54°F | 100 mm | 71% | 56% |
| September | 18°C / 65°F | 9°C / 48°F | 77 mm | 75% | 58% |
| October | 14°C / 57°F | 5°C / 41°F | 95 mm | 79% | 66% |
| November | 8°C / 46°F | 1°C / 33°F | 88 mm | 83% | 73% |
| December | 3°C / 38°F | -3°C / 26°F | 111 mm | 83% | 74% |
What to pack for September
- A warm sweater or fleece for layering
- A mid-weight jacket
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is September a good time to visit Lausanne?
Compare the months in the chart above to find your ideal window.
Best time to visit Lausanne →Other Switzerland cities in September
Cite or embed this data
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Lausanne weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/switzerland/lausanne/september
<a href="https://weathercompare.eu/weather/switzerland/lausanne/september">Lausanne weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/switzerland/lausanne" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Lausanne weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/switzerland/lausanne/september">Lausanne weather in September</a> – WeatherCompare</p>
Lausanne in September: quick answers
Is September a good time to visit Lausanne?
Yes. September is one of the best months for Lausanne, with highs around 18°C and about 77 mm of rain.
How warm is Lausanne in September?
Average highs are about 18°C (65°F) and average lows about 9°C (48°F), based on 10 years of daily data.
Does it rain a lot in Lausanne in September?
Lausanne typically gets around 77 mm of rain in September — some rain.
Figures are long-term averages for the area around Lausanne (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.