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September Weather in Oswego, United States

Last updated: June 24, 2025

In Oswego, United States, the average temperature in September is a pleasant 19°C (66°F). Expect a refreshing minimum of 7°C (46°F) and a warm maximum reaching 30°C (86°F). During this month, you'll experience an average precipitation of 95 mm (3.8 in) spread over 10 days, accompanied by an average humidity level of 78%. Stay prepared for the delightful yet varied weather!

September Temperature in Oswego

In September in Oswego, the average temperature is 19°C (66°F). Maximum temperatures can reach 30°C (86°F), while minimums can dip as low as 7°C (46°F). This range makes Oswego a comfortable destination for travelers looking to enjoy mild weather and explore various outdoor activities.

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

The chart illustrates September temperature patterns in Oswego, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oswego, September typically has an average temperature of 19°C (66°F), with highs reaching up to 30°C (86°F) and lows dropping to around 7°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec282934435262727266554234
Data source: Temperature data for Oswego 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 Oswego

In Oswego in September, the precipitation amount is 95 mm (3.8 in) over the course of 10 days.

September Precipitation Trends in Oswego

The chart displays monthly precipitation patterns in Oswego, 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 Oswego, September typically receives around 95 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec108104921271179017711995187137140
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Oswego

In Oswego in September, humidity is 78%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making traveling quite uncomfortable unless you're well-prepared with lightweight, breathable clothing and frequent breaks to stay hydrated.

September Average Humidity in Oswego

This chart illustrates the average monthly humidity levels in Oswego, 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 Oswego is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Oswego

In Oswego 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 Oswego.

Maximum UV Index Levels in Oswego for September

The chart shows the monthly maximum UV Index (UVI) for Oswego 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 Oswego typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2468910997532
Data source: Oswego 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 Oswego Compares to Other Months

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

This table compares monthly weather conditions in Oswego, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)108 mm (4.3 inches)90%low
February Weather-2°C (29°F)104 mm (4.1 inches)90%moderate
March Weather1°C (34°F)92 mm (3.6 inches)87%high
April Weather6°C (43°F)127 mm (5.0 inches)88%very high
May Weather11°C (52°F)117 mm (4.6 inches)82%very high
June Weather17°C (62°F)90 mm (3.6 inches)79%very high
July Weather22°C (72°F)177 mm (7.0 inches)78%very high
August Weather22°C (72°F)119 mm (4.7 inches)76%very high
September Weather19°C (66°F)95 mm (3.8 inches)78%high
October Weather13°C (56°F)187 mm (7.4 inches)84%moderate
November Weather6°C (42°F)137 mm (5.4 inches)89%moderate
December Weather1°C (35°F)140 mm (5.5 inches)86%low

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