Verdict: Excellent month
Geneva Weather in September
September hits the sweet spot in Geneva — highs around 22°C (72°F), ideal for a full day on foot. Expect showers on roughly 10 days of the month — rarely trip-ruining, worth planning around. Overall, September is one of the best months of the year to be in Geneva.
Average high
22°C / 72°F
Average low
13°C / 55°F
Rain days
~10
Precipitation
99 mm
What to pack for Geneva in September
- Summer clothes, plus one light layer for air-con and evenings
- A packable rain shell or compact umbrella earns its space
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Geneva: Jul (27°C / 81°F) · Coolest: Jan (6°C / 43°F) · Wettest: Dec (~15 rain days)
6°
0°
Jan
9°
1°
Feb
12°
3°
Mar
15°
5°
Apr
19°
10°
May
24°
15°
Jun
27°
17°
Jul
27°
17°
Aug
22°
13°
Sep
17°
9°
Oct
10°
4°
Nov
6°
1°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)