September Weather in Geneva, United States

Last updated: June 24, 2025

In September, the average temperature in Geneva, United States is a warm 27°C (81°F). Expect a minimum of 19°C (67°F) and a sweltering maximum of 35°C (95°F). Be prepared for some rain, as precipitation measures 191 mm (7.5 in) over 21 days, accompanied by an average humidity of 83%.

September Temperature in Geneva

In September in Geneva, the average temperature is 27°C (81°F). Maximums can reach 35°C (95°F) and minimums can be as low as 19°C (67°F). This pleasant climate makes Geneva an ideal destination for travelers seeking warm and enjoyable weather.

September Weather in Geneva: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Geneva, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Geneva, September typically has an average temperature of 27°C (81°F), with highs reaching up to 35°C (95°F) and lows dropping to around 19°C (67°F).

Data source: Temperature data for Geneva generated using information from the Copernicus Climate Change Service.

September Precipitation in Geneva

In Geneva in September, the precipitation amount is 191 mm (7.5 in) during a span of 21 days.

September Precipitation Trends in Geneva

The chart displays monthly precipitation patterns in Geneva, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Geneva, September typically receives around 191 mm (7.5 inches) of precipitation spread over approximately 21 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Geneva

In Geneva in September humidity is 83%. With an average temperature of 27°C (81°F), this humidity feels like a warm blanket enveloping you, making sightseeing and outdoor activities feel more exhausting and requiring frequent breaks to relax in the shade or cool off.

September Average Humidity in Geneva

This chart illustrates the average monthly humidity levels in Geneva, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Geneva is approximately 83%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Geneva

In Geneva in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Geneva.

Maximum UV Index Levels in Geneva for September

The chart shows the monthly maximum UV Index (UVI) for Geneva in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Geneva typically reaches 11, which falls under the extreme exposure category.

Data source: Geneva September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in Geneva Compares to Other Months

Weather in Geneva varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Geneva, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Geneva, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	16°C (62°F)	35 mm (1.4 inches)	83%	moderate
February Weather	19°C (67°F)	53 mm (2.1 inches)	80%	very high
March Weather	20°C (68°F)	25 mm (1.0 inches)	75%	very high
April Weather	22°C (73°F)	76 mm (3.0 inches)	70%	extreme
May Weather	25°C (77°F)	124 mm (4.9 inches)	68%	extreme
June Weather	27°C (81°F)	231 mm (9.1 inches)	75%	extreme
July Weather	28°C (82°F)	244 mm (9.6 inches)	79%	extreme
August Weather	28°C (82°F)	268 mm (10.5 inches)	81%	extreme
September Weather	27°C (81°F)	191 mm (7.5 inches)	83%	extreme
October Weather	25°C (78°F)	95 mm (3.7 inches)	81%	very high
November Weather	21°C (69°F)	55 mm (2.2 inches)	82%	high
December Weather	18°C (64°F)	69 mm (2.7 inches)	84%	moderate