September Weather in Storrs, United States

Last updated: June 24, 2025

In September, the average temperature in Storrs, United States hovers around 19°C (66°F). Expect a range, with minimums dipping to 3°C (38°F) and maximums soaring up to 34°C (93°F). Prepare for some rain; precipitation averages 97 mm (3.8 in) over 9 days. Additionally, the air tends to be quite humid, with an average humidity of 75%.

September Temperature in Storrs

In September in Storrs, the average temperature is 19°C (66°F). Maximums can reach 34°C (93°F), while minimums can dip to as low as 3°C (38°F). This variability makes Storrs a great destination for travelers who enjoy diverse weather experiences.

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

The chart illustrates September temperature patterns in Storrs, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Storrs, September typically has an average temperature of 19°C (66°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (38°F).

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

September Precipitation in Storrs

In Storrs in September, the total precipitation amount reaches 97 mm (3.8 in) over the course of 9 days.

September Precipitation Trends in Storrs

The chart displays monthly precipitation patterns in Storrs, 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 Storrs, September typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 9 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Storrs

In Storrs in September humidity is 75%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making it slightly uncomfortable for traveling as you navigate through the thick, muggy air.

September Average Humidity in Storrs

This chart illustrates the average monthly humidity levels in Storrs, 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 Storrs is approximately 75%, 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 Storrs

In Storrs 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 Storrs.

Maximum UV Index Levels in Storrs for September

The chart shows the monthly maximum UV Index (UVI) for Storrs 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 Storrs typically reaches 8, which falls under the very high exposure category.

Data source: Storrs 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 Storrs Compares to Other Months

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

This table compares monthly weather conditions in Storrs, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (31°F)	68 mm (2.7 inches)	84%	moderate
February Weather	0°C (33°F)	87 mm (3.4 inches)	84%	moderate
March Weather	3°C (39°F)	92 mm (3.6 inches)	82%	high
April Weather	9°C (49°F)	127 mm (5.0 inches)	79%	very high
May Weather	15°C (59°F)	113 mm (4.5 inches)	75%	very high
June Weather	20°C (69°F)	92 mm (3.6 inches)	78%	very high
July Weather	23°C (74°F)	151 mm (6.0 inches)	76%	very high
August Weather	23°C (73°F)	102 mm (4.0 inches)	76%	very high
September Weather	19°C (66°F)	97 mm (3.8 inches)	75%	very high
October Weather	13°C (56°F)	133 mm (5.2 inches)	75%	high
November Weather	6°C (43°F)	94 mm (3.7 inches)	80%	moderate
December Weather	1°C (34°F)	127 mm (5.0 inches)	80%	low