September Weather in Oswego, United States

Last updated: June 24, 2025

The average temperature in Oswego, United States during September hovers around 24°C (75°F). However, temperatures can vary significantly, with a minimum of 7°C (45°F) and a maximum soaring to 35°C (95°F). Expect 94 mm (3.7 in) of precipitation spread over 7 days, contributing to an average humidity level of 67%.

September Temperature in Oswego

In September in Oswego, the average temperature is 24°C (75°F). Maximums can reach 35°C (95°F) and minimums can be as low as 7°C (45°F). It’s a great time to visit for those who enjoy mild to warm weather with a chance of cooler evenings.

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 24°C (75°F), with highs reaching up to 35°C (95°F) and lows dropping to around 7°C (45°F).

Data source: Temperature data for Oswego generated using information from the Copernicus Climate Change Service.

September Precipitation in Oswego

In Oswego in September, the precipitation amount is 94 mm (3.7 in) over a span of 7 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 94 mm (3.7 inches) of precipitation spread over approximately 7 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Oswego

In Oswego in September humidity is 67%. With an average temperature of 24°C (75°F), this humidity feels like a warm and sticky embrace, making traveling a bit uncomfortable as you find yourself seeking shade and refreshing drinks more often.

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 67%, offering insight into how humid the weather typically is during this month.

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 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 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 9, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	67 mm (2.6 inches)	77%	moderate
February Weather	3°C (38°F)	65 mm (2.6 inches)	76%	moderate
March Weather	10°C (51°F)	128 mm (5.0 inches)	71%	high
April Weather	14°C (58°F)	124 mm (4.9 inches)	73%	very high
May Weather	20°C (68°F)	239 mm (9.4 inches)	83%	very high
June Weather	26°C (78°F)	96 mm (3.8 inches)	83%	extreme
July Weather	27°C (81°F)	98 mm (3.8 inches)	81%	extreme
August Weather	26°C (79°F)	117 mm (4.6 inches)	73%	very high
September Weather	24°C (75°F)	94 mm (3.7 inches)	67%	very high
October Weather	16°C (60°F)	127 mm (5.0 inches)	72%	high
November Weather	9°C (48°F)	53 mm (2.1 inches)	82%	moderate
December Weather	6°C (42°F)	40 mm (1.6 inches)	85%	moderate