September Weather in Chaska, United States

Last updated: June 24, 2025

In September, the average temperature in Chaska, United States hovers around 18°C (65°F). Be prepared for a temperature range that can dip to a chilly 2°C (35°F) and soar to a warm 33°C (91°F). Expect about 121 mm (4.8 in) of precipitation spread over 9 days, contributing to an average humidity of 81%. Stay comfortable and enjoy your stay!

September Temperature in Chaska

In September in Chaska, the average temperature is 18°C (65°F). The maximum can reach 33°C (91°F), while the minimum can be as low as 2°C (35°F). Pack accordingly for a varied climate to fully enjoy your trip to Chaska.

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

The chart illustrates September temperature patterns in Chaska, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chaska, September typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (35°F).

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

September Precipitation in Chaska

In Chaska in September, the precipitation amount is 121 mm (4.8 in) over the course of 9 days.

September Precipitation Trends in Chaska

The chart displays monthly precipitation patterns in Chaska, 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 Chaska, September typically receives around 121 mm (4.8 inches) of precipitation spread over approximately 9 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 Chaska

In Chaska in September, humidity is 81%. With an average temperature of 18°C (65°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier and the air thick and sultry—a challenging environment for traveling.

September Average Humidity in Chaska

This chart illustrates the average monthly humidity levels in Chaska, 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 Chaska is approximately 81%, 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 Chaska

In Chaska 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 Chaska.

Maximum UV Index Levels in Chaska for September

The chart shows the monthly maximum UV Index (UVI) for Chaska 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 Chaska typically reaches 7, which falls under the high exposure category.

Data source: Chaska 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 Chaska Compares to Other Months

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

This table compares monthly weather conditions in Chaska, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-8°C (17°F)	30 mm (1.2 inches)	87%	low
February Weather	-8°C (17°F)	33 mm (1.3 inches)	90%	moderate
March Weather	1°C (33°F)	60 mm (2.4 inches)	85%	moderate
April Weather	6°C (44°F)	82 mm (3.2 inches)	84%	high
May Weather	15°C (59°F)	130 mm (5.1 inches)	78%	very high
June Weather	22°C (72°F)	91 mm (3.6 inches)	80%	very high
July Weather	24°C (75°F)	107 mm (4.2 inches)	81%	very high
August Weather	22°C (71°F)	142 mm (5.6 inches)	81%	very high
September Weather	18°C (65°F)	121 mm (4.8 inches)	81%	high
October Weather	9°C (49°F)	90 mm (3.6 inches)	84%	moderate
November Weather	1°C (34°F)	34 mm (1.3 inches)	88%	moderate
December Weather	-5°C (24°F)	47 mm (1.9 inches)	84%	low