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September Weather in Geneva, United States

Last updated: June 24, 2025

In September, the average temperature in Geneva, United States hovers around 21°C (71°F). Expect a range from a cool 4°C (40°F) to a sizzling 37°C (98°F). With approximately 70 mm (2.7 in) of precipitation over about 7 days, the atmosphere carries a notable average humidity of 77%. Prepare for a mix of warm weather and occasional showers!

September Temperature in Geneva

In September in Geneva, the average temperature is 21°C (71°F), with maximums reaching up to 37°C (98°F) and minimums dropping as low as 4°C (40°F). This dynamic range makes it essential for travelers to pack accordingly, ensuring comfort and readiness for any weather changes.

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 21°C (71°F), with highs reaching up to 37°C (98°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec272742516376797570534133
Data source: Temperature data for Geneva generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Geneva

In Geneva in September, the precipitation amount is 70 mm (2.7 in) over a period of 7 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 70 mm (2.7 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec3024924616296538170952439
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Geneva

In Geneva in September, humidity is 77%. With an average temperature of 21°C (71°F), this humidity feels like a warm embrace that envelops you, making it both refreshing and slightly heavy, which can be a bit tiring for traveling.

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 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec73%81%69%71%80%83%84%84%77%72%80%79%
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 is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111108643
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.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (28°F)30 mm (1.2 inches)73%moderate
February Weather-3°C (27°F)24 mm (0.9 inches)81%moderate
March Weather6°C (42°F)92 mm (3.6 inches)69%high
April Weather11°C (51°F)46 mm (1.8 inches)71%very high
May Weather17°C (63°F)162 mm (6.4 inches)80%very high
June Weather25°C (76°F)96 mm (3.8 inches)83%extreme
July Weather26°C (79°F)53 mm (2.1 inches)84%extreme
August Weather24°C (75°F)80 mm (3.2 inches)84%very high
September Weather21°C (71°F)70 mm (2.7 inches)77%very high
October Weather12°C (53°F)95 mm (3.8 inches)72%high
November Weather5°C (42°F)24 mm (1.0 inches)80%moderate
December Weather1°C (33°F)39 mm (1.5 inches)79%moderate

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