Climate averages 1991–2020

Geneva weather
in August.

A warm, wet month: the 2nd warmest and the 7th driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 24.0°C Daytime mean, August

Average low 15.5°C Night-time mean, August

Rainfall 117 mm 13 days with ≥1 mm

Daylight 14 h Sunrise to sunset, per day

August is a warm month in Geneva: daytime highs average 24.0°C and nights cool to about 15.5°C. By daytime temperature it is the 2nd warmest of the 12 months.

Expect about 117 mm of rain on roughly 13 days, which makes August a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 10 min on an average August day.

The nearest other city in this atlas is Lausanne (51 km away). In August its highs average 22.8°C, 1.2°C cooler than Geneva, with 116 mm of rain.

Among the 8 cities listed in Switzerland, Geneva ranks 2nd of 8 for the warmest August highs and 4th of 8 for the driest August (rainfall, lowest first). The mean August high of those 8 cities is 22.9°C; Geneva is 1.1°C warmer than that mean.

From August to September, average highs fall by 4.2°C to 19.8°C, and monthly rainfall falls from 117 mm to 109 mm.

The annual picture

August in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Geneva climate table

1991–2020

Monthly climate averages for Geneva, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	5.3°C-0.9°C	-0.9°C	115	12.5	9.19 h
February	6.5°C-0.6°C	-0.6°C	100	11.0	10.310 h
March	10.8°C2.1°C	2.1°C	109	12.7	11.912 h
April	14.7°C5.4°C	5.4°C	109	13.5	13.514 h
May	18.4°C9.5°C	9.5°C	144	15.9	14.915 h
June	22.0°C13.3°C	13.3°C	123	14.7	15.716 h
July	24.1°C15.5°C	15.5°C	123	12.8	15.415 h
August, selected	24.0°C15.5°C	15.5°C	117	12.7	14.214 h
September	19.8°C11.6°C	11.6°C	109	12.2	12.613 h
October	15.8°C7.5°C	7.5°C	112	12.4	11.011 h
November	9.7°C2.7°C	2.7°C	125	13.5	9.59 h
December	5.9°C-0.1°C	-0.1°C	131	13.4	8.79 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

August in nearby cities

Distance from Geneva

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Geneva) is explained once on the Geneva year overview and on the Sources, method and limits page.