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September Weather in Oshkosh, United States

Last updated: June 24, 2025

In September, the average temperature in Oshkosh, United States hovers around 18°C (64°F), with minimums dipping to 5°C (41°F) and maximums soaring up to 31°C (87°F). Expect 75 mm (3.0 in) of precipitation over approximately 11 days, coupled with an average humidity of 79%. Ideal for those who enjoy a mix of mild warmth and refreshing rain!

September Temperature in Oshkosh

In September in Oshkosh, the average temperature is 18°C (64°F). Maximums can reach 31°C (87°F), and minimums can drop as low as 5°C (41°F). This variation in temperature makes Oshkosh an ideal destination for travelers seeking both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Oshkosh, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oshkosh, September typically has an average temperature of 18°C (64°F), with highs reaching up to 31°C (87°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec212132425769747164513628
Data source: Temperature data for Oshkosh 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 Oshkosh

In Oshkosh in September, the precipitation amount is 75 mm (3.0 in) over a span of 11 days.

September Precipitation Trends in Oshkosh

The chart displays monthly precipitation patterns in Oshkosh, 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 Oshkosh, September typically receives around 75 mm (3.0 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec43466094107101100107751014747
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Oshkosh

In Oshkosh in September, humidity is 79%. With an average temperature of 18°C (64°F), this humidity feels like a warm, sticky embrace that can make outdoor activities more challenging but also creates a lush, vibrant atmosphere that's perfect for exploring local culture and scenery.

September Average Humidity in Oshkosh

This chart illustrates the average monthly humidity levels in Oshkosh, 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 Oshkosh is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Oshkosh

In Oshkosh in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Oshkosh.

Maximum UV Index Levels in Oshkosh for September

The chart shows the monthly maximum UV Index (UVI) for Oshkosh 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 Oshkosh typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34589101097532
Data source: Oshkosh 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 Oshkosh Compares to Other Months

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

This table compares monthly weather conditions in Oshkosh, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)43 mm (1.7 inches)85%moderate
February Weather-6°C (21°F)46 mm (1.8 inches)85%moderate
March Weather0°C (32°F)60 mm (2.4 inches)85%moderate
April Weather6°C (43°F)94 mm (3.7 inches)85%very high
May Weather14°C (57°F)107 mm (4.2 inches)78%very high
June Weather20°C (69°F)101 mm (4.0 inches)80%very high
July Weather23°C (74°F)100 mm (3.9 inches)78%very high
August Weather22°C (71°F)107 mm (4.2 inches)76%very high
September Weather18°C (64°F)75 mm (3.0 inches)79%high
October Weather11°C (51°F)101 mm (4.0 inches)83%moderate
November Weather2°C (36°F)47 mm (1.8 inches)88%moderate
December Weather-2°C (28°F)47 mm (1.9 inches)81%low

Compare Oshkosh's Climate with Cities Worldwide