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September Weather in Oshkosh, United States

Last updated: June 24, 2025

In Oshkosh, United States, the average temperature in September hovers around 19°C (67°F). Extremes can range from a chilly 1°C (35°F) to a scorching 38°C (100°F). Expect some rain, with 32 mm (1.3 in) of precipitation over approximately 5 days, while the air maintains a comfortable 70% humidity.

September Temperature in Oshkosh

In September in Oshkosh, the average temperature is 19°C (67°F). Maximums can reach 38°C (100°F), while minimums can drop as low as 1°C (35°F). This makes Oshkosh a versatile destination for travelers, suitable for both warm-weather activities and cooler, more relaxed explorations.

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 19°C (67°F), with highs reaching up to 38°C (100°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec292740475771767367484032
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 32 mm (1.3 in) over the course of 5 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 32 mm (1.3 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec1218605213549534732332017
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 70%. With an average temperature of 19°C (67°F), this humidity feels like a warm blanket wrapping around you, making traveling somewhat uncomfortable and sticky, as the air feels dense and every movement requires a bit more effort.

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 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec73%80%64%64%76%79%77%79%70%64%75%78%
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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109643
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-2°C (30°F)12 mm (0.5 inches)73%moderate
February Weather-3°C (28°F)18 mm (0.7 inches)80%moderate
March Weather4°C (40°F)59 mm (2.3 inches)64%high
April Weather8°C (47°F)52 mm (2.1 inches)64%very high
May Weather14°C (57°F)135 mm (5.3 inches)76%very high
June Weather22°C (71°F)49 mm (1.9 inches)79%extreme
July Weather25°C (76°F)53 mm (2.1 inches)77%extreme
August Weather23°C (73°F)47 mm (1.8 inches)79%very high
September Weather19°C (67°F)32 mm (1.3 inches)70%very high
October Weather9°C (48°F)33 mm (1.3 inches)64%high
November Weather5°C (41°F)20 mm (0.8 inches)75%moderate
December Weather0°C (33°F)17 mm (0.7 inches)78%moderate

Compare Oshkosh's Climate with Cities Worldwide