September Weather in Grantsburg, United States

Last updated: June 24, 2025

In September, the average temperature in Grantsburg, United States hovers around 17°C (63°F), making it a pleasant time to explore. However, be prepared for a range in temperatures, with minimums dipping to 0°C (33°F) and maximums soaring to 32°C (90°F). Rainfall is frequent during this month, with an average precipitation of 96 mm (3.8 in) spread over 10 days. Additionally, expect high humidity levels at 81%, contributing to the overall climate experience.

September Temperature in Grantsburg

In September in Grantsburg, the average temperature is 17°C (63°F). Maximums can reach 32°C (90°F), and minimums can drop as low as 0°C (33°F). Therefore, travelers should be prepared for a wide range of weather conditions.

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

The chart illustrates September temperature patterns in Grantsburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grantsburg, September typically has an average temperature of 17°C (63°F), with highs reaching up to 32°C (90°F) and lows dropping to around 0°C (33°F).

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

September Precipitation in Grantsburg

In Grantsburg in September, the total precipitation amount is 96 mm (3.8 in) over a span of 10 days.

September Precipitation Trends in Grantsburg

The chart displays monthly precipitation patterns in Grantsburg, 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 Grantsburg, September typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 10 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 Grantsburg

In Grantsburg in September humidity is 81%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket enveloping you, making travel slightly oppressive and calling for frequent breaks in air-conditioned spaces to recharge and enjoy your journey comfortably.

September Average Humidity in Grantsburg

This chart illustrates the average monthly humidity levels in Grantsburg, 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 Grantsburg 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 Grantsburg

In Grantsburg 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 Grantsburg.

Maximum UV Index Levels in Grantsburg for September

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

Data source: Grantsburg 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 Grantsburg Compares to Other Months

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

This table compares monthly weather conditions in Grantsburg, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-10°C (15°F)	20 mm (0.8 inches)	87%	low
February Weather	-9°C (16°F)	30 mm (1.2 inches)	90%	moderate
March Weather	0°C (32°F)	47 mm (1.8 inches)	85%	moderate
April Weather	6°C (42°F)	89 mm (3.5 inches)	84%	high
May Weather	14°C (58°F)	104 mm (4.1 inches)	78%	very high
June Weather	21°C (70°F)	80 mm (3.2 inches)	80%	very high
July Weather	23°C (73°F)	100 mm (4.0 inches)	81%	very high
August Weather	21°C (70°F)	127 mm (5.0 inches)	81%	very high
September Weather	17°C (63°F)	96 mm (3.8 inches)	81%	high
October Weather	8°C (47°F)	100 mm (3.9 inches)	84%	moderate
November Weather	0°C (32°F)	38 mm (1.5 inches)	88%	moderate
December Weather	-6°C (22°F)	54 mm (2.1 inches)	84%	low