September Weather in Mahnomen, United States

Last updated: June 24, 2025

In September, the average temperature in Mahnomen, United States hovers around 15°C (59°F), with minimum temperatures dipping to -3°C (27°F) and peaks reaching up to 31°C (88°F). Expect around 100 mm (3.9 in) of precipitation spread over 11 days, contributing to an average humidity level of 77%. Prepare for fluctuating weather as you explore this vibrant location!

September Temperature in Mahnomen

In September in Mahnomen, the average temperature is 15°C (59°F). The maximum can reach 31°C (88°F), while the minimum can drop as low as -3°C (27°F). This variety in temperatures makes for a diverse travel experience, so be sure to pack both light and warm clothing for your trip.

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

The chart illustrates September temperature patterns in Mahnomen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mahnomen, September typically has an average temperature of 15°C (59°F), with highs reaching up to 31°C (88°F) and lows dropping to around -3°C (27°F).

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

September Precipitation in Mahnomen

In Mahnomen in September, the precipitation amount is 100 mm (3.9 in) over the course of 11 days.

September Precipitation Trends in Mahnomen

The chart displays monthly precipitation patterns in Mahnomen, 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 Mahnomen, September typically receives around 100 mm (3.9 inches) of precipitation spread over approximately 11 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 Mahnomen

In Mahnomen in September, humidity is 77%. With an average temperature of 15°C (59°F), this humidity feels like a warm blanket enveloping you, making it essential to stay hydrated and choose light, breathable clothing for comfortable travel.

September Average Humidity in Mahnomen

This chart illustrates the average monthly humidity levels in Mahnomen, 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 Mahnomen is approximately 77%, 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 Mahnomen

In Mahnomen 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 Mahnomen.

Maximum UV Index Levels in Mahnomen for September

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

Data source: Mahnomen 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 Mahnomen Compares to Other Months

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

This table compares monthly weather conditions in Mahnomen, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-12°C (10°F)	20 mm (0.8 inches)	90%	low
February Weather	-13°C (9°F)	23 mm (0.9 inches)	92%	moderate
March Weather	-3°C (28°F)	26 mm (1.0 inches)	85%	moderate
April Weather	4°C (39°F)	54 mm (2.1 inches)	81%	high
May Weather	13°C (56°F)	49 mm (1.9 inches)	75%	very high
June Weather	20°C (68°F)	77 mm (3.0 inches)	79%	very high
July Weather	22°C (72°F)	78 mm (3.1 inches)	76%	very high
August Weather	20°C (68°F)	93 mm (3.7 inches)	78%	very high
September Weather	15°C (59°F)	100 mm (3.9 inches)	77%	high
October Weather	6°C (43°F)	83 mm (3.3 inches)	79%	moderate
November Weather	-3°C (27°F)	26 mm (1.0 inches)	86%	moderate
December Weather	-8°C (17°F)	42 mm (1.7 inches)	86%	low