What September feels like in Geneva
For Geneva, September is early autumn on the calendar. Mild afternoons make it easy to spend hours outdoors. After dark the temperature drops clearly: nights are cool. Humidity is on the high side, but mild temperatures keep it comfortable.
Rain in Geneva in September
Showers are a regular feature, arriving about one day in 3. Each rainy day adds about 8.9 mm (0.4 in), a proper wetting rather than a sprinkle. Across the year Geneva averages about 8.7 mm per rainy day, so September is typical. It is among the three driest months of the year.
Daylight and sunshine in September
In mid-September, sunrise is at about 7:12 am and sunset at about 7:50 pm (local time) — 12 h 38 min of daylight. Evenings are drawing in — 1 h 36 min less daylight than mid-August. The sun is out for roughly 78% of those daylight hours, so there are plenty of bright spells.
How September compares to the rest of the year
Ranked by average high, September comes out as the 4th warmest month in Geneva. Afternoons run 4.3°C (7.7°F) cooler than in August, with 7 mm less rain. October is cooler again. The next month's average high: 16.3°C (61.3°F).
Who September suits
- Sightseeing: a good fit — daytime temperatures are fine for walking around.
- Parks & outdoor: a good fit — good conditions for sitting outside.
- Hiking: a good fit — mild temperatures for trails.
Tips for visiting Geneva in September
Versatile Layers
Pack pieces you can take off by noon and put back on at dusk.
Rain Protection
Keep a small umbrella in your bag and wear shoes that cope with puddles.
Sunglasses
Plenty of sun, so bring sunglasses and a cap.
Quick questions
How warm is Geneva in September?
Afternoons average 20.8°C (69.4°F) and nights about 12.4°C (54.3°F) — mild by most people's standards. It is the 4th warmest month of the year.
Does it rain a lot in Geneva in September?
Yes, fairly — rain falls about one day in 3 and totals about 98 mm, so an umbrella is worth carrying.
What should I wear in Geneva in September?
The numbers point to versatile layers, rain protection and sunglasses. Add a layer for after dark.
Is September or October better for visiting Geneva?
September scores better on our climate ranking (#2 of 12 vs #6), rated Good against Good. October is cooler.