September weather forecastGeneva, Switzerland

The Leman Lake, flowing through the city of Geneva, Switzerland

September

Weather in September

September rings in autumn, bringing slight chilliness back in the air, as temperatures drop to highs of approximately 20.9°C (69.6°F). Despite this, the city remains charming with adequate sunshine bolstering the fabulous views. Geneva is marked by a color shift as the leaves transform from cheery greens to warmer hues of orange and brown. Amidst the season's transitions and the moderate rainfall, the city presents a captivating fusion of summer's remnant warmth with whispers of the coming cool season.

Temperature

The transition into September in Geneva involves a small decrease in the average high-temperature, dipping slightly from a warm 25.8°C (78.4°F) in August to an agreeable 20.9°C (69.6°F). Geneva's September nights cool down to an average low-temperature of 10.8°C (51.4°F).

Humidity

In September, the average relative humidity is 73%.

Rainfall

In Geneva, during September, the rain falls for 8.1 days and regularly aggregates up to 100mm (3.94") of precipitation. In Geneva, during the entire year, the rain falls for 109 days and collects up to 1006mm (39.61") of precipitation.

Snowfall

May through October are months without snowfall in Geneva.

Daylight

In September, the average length of the day in Geneva, Switzerland, is 12h and 32min.
On the first day of the month, sunrise is at 06:56 and sunset at 20:13. On the last day of September, sunrise is at 07:33 and sunset at 19:17 CEST.

Sunshine

In September, the average sunshine in Geneva is 6.2h.

UV index

In Geneva, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for average individuals.
Note: In September, the UV index of 5 transforms into the following advice:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.

Updated: Jan 24, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The high-temperature in Geneva during September is 20.9°C (69.6°F) and the low-temperature is 10.8°C (51.4°F).

In September, the average relative humidity in Geneva, Switzerland, is 73%.

In Geneva, Switzerland, during September, the rain falls for 8.1 days and regularly aggregates up to 100mm (3.94") of precipitation.

In Geneva, Switzerland, snow does not fall in May through October.

In September, the average day length is 12h and 32min.

On the first day of September in Geneva, sunrise is at 06:56 and sunset at 20:13. On the last day of the month, sunrise is at 07:33 and sunset at 19:17 CEST.

The average sunshine duration in September in Geneva, Switzerland, is 6.2h.

The average daily maximum UV index in September in Geneva, Switzerland, is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

25.8°C

20.9°C

15.4°C

Average low temperature

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average UV index

Average temperature in September
Geneva, Switzerland

Average high temperature in September: 20.9°C

The warmest month (with the highest average high temperature) is July (26.5°C).
The month with the lowest average high temperature is January (4.5°C).

Average low temperature in September: 10.8°C

The month with the highest average low temperature is July (14.4°C).
The coldest month (with the lowest average low temperature) is January (-1.3°C).

Average humidity in September
Geneva, Switzerland

Average humidity in September: 73%

The months with the highest relative humidity are January, November and December (81%).
The month with the lowest relative humidity is July (64%).

Average rainfall in September
Geneva, Switzerland

Average rainfall in September: 100mm

The wettest month (with the highest rainfall) is October (105mm).
The driest month (with the least rainfall) is February (68mm).

Average rainfall days in September
Geneva, Switzerland

Average rainfall days in September: 8.1 days

The month with the highest number of rainy days is May (10.6 days).
The month with the least rainy days is July (7.6 days).

Average snowfall in September
Geneva, Switzerland

Average snowfall in September: 0mm

The month with the highest snowfall is January (108mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).

Average snowfall days in September
Geneva, Switzerland

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (2.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Geneva, Switzerland

Average daylight in September: 12h and 30min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

Average sunshine in September: 6h and 12min

The month with the most sunshine is July (Average sunshine: 8h and 30min).
The month with the least sunshine is December (Average sunshine: 1h and 36min).

Average UV index in September
Geneva, Switzerland

Average UV index in September: 5

The months with the highest UV index are June and July (UV index 8).
The months with the lowest UV index are January, November and December (UV index 1).