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September Weather in Geneva, United States

Last updated: June 24, 2025

In Geneva, United States, the average temperature in September hovers around 18°C (65°F). Expect a range of temperatures, with a minimum dipping to 2°C (36°F) and a maximum soaring to 33°C (91°F). During this month, you can anticipate 124 mm (4.9 in) of precipitation over 9 days, accompanied by an average humidity level of 75%. Prepare for a mix of weather as you explore this vibrant locale!

September Temperature in Geneva

In September in Geneva, the average temperature is 18°C (65°F), with maximums reaching 33°C (91°F) and minimums dropping as low as 2°C (36°F). This makes Geneva an ideal destination for travelers seeking a mix of comfortable days and cooler evenings.

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 18°C (65°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec171633445971737064483425
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 124 mm (4.9 in) over the course of 9 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 124 mm (4.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec364669861461391031101241014539
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 75%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket that can make outdoor exploration feel a bit stifling, potentially leading to discomfort during travel activities.

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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%80%81%74%81%80%77%75%80%87%83%
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.
JanFebMarAprMayJunJulAugSepOctNovDec35589101098533
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-8°C (17°F)36 mm (1.4 inches)82%moderate
February Weather-9°C (17°F)46 mm (1.8 inches)84%moderate
March Weather1°C (34°F)69 mm (2.7 inches)80%moderate
April Weather7°C (44°F)86 mm (3.4 inches)81%very high
May Weather15°C (59°F)146 mm (5.8 inches)74%very high
June Weather22°C (71°F)139 mm (5.5 inches)80%very high
July Weather23°C (74°F)103 mm (4.1 inches)80%very high
August Weather21°C (70°F)110 mm (4.3 inches)77%very high
September Weather18°C (65°F)124 mm (4.9 inches)75%very high
October Weather9°C (49°F)101 mm (4.0 inches)80%moderate
November Weather1°C (34°F)45 mm (1.8 inches)87%moderate
December Weather-4°C (25°F)39 mm (1.6 inches)83%moderate

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