May Weather in Thief River Falls, United States

Last updated: June 24, 2025

In Thief River Falls, United States, the average temperature in May is a comfortable 13°C (55°F). However, temperatures can swing dramatically, with minimums dropping to -4°C (25°F) and maximums soaring to 32°C (90°F). Expect approximately 54 mm (2.1 in) of precipitation over about 8 days, all while enjoying an average humidity level of 75%.

May Temperature in Thief River Falls

In May in Thief River Falls, the average temperature is 13°C (55°F). Maximum temperatures can reach 32°C (90°F), while minimums can drop as low as -4°C (25°F). This temperature range suggests that travelers should prepare for both warm days and possibly chilly nights.

May Weather in Thief River Falls: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Thief River Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Thief River Falls, May typically has an average temperature of 13°C (55°F), with highs reaching up to 32°C (90°F) and lows dropping to around -4°C (25°F).

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

May Precipitation in Thief River Falls

In Thief River Falls in May, the total precipitation amount reaches 54 mm (2.1 in) over a span of 8 days.

May Precipitation Trends in Thief River Falls

The chart displays monthly precipitation patterns in Thief River Falls, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Thief River Falls, May typically receives around 54 mm (2.1 inches) of precipitation spread over approximately 8 days.

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

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Millimeters (mm) Inches (in)

May Humidity in Thief River Falls

In Thief River Falls in May humidity is 75%. With average temperature 13°C (55°F), this humidity feels like a damp chill that seeps into your bones, making outdoor excursions less enjoyable without layered clothing and frequent breaks to warm up indoors.

May Average Humidity in Thief River Falls

This chart illustrates the average monthly humidity levels in Thief River Falls, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Thief River Falls is approximately 75%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Thief River Falls

In Thief River Falls in May, 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 Thief River Falls.

Maximum UV Index Levels in Thief River Falls for May

The chart shows the monthly maximum UV Index (UVI) for Thief River Falls in May, 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 May, the maximum UV index in Thief River Falls typically reaches 8, which falls under the very high exposure category.

Data source: Thief River Falls May 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 May Weather in Thief River Falls Compares to Other Months

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

This table compares monthly weather conditions in Thief River Falls, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-13°C (9°F)	19 mm (0.8 inches)	90%	low
February Weather	-14°C (8°F)	22 mm (0.9 inches)	92%	moderate
March Weather	-3°C (27°F)	26 mm (1.0 inches)	85%	moderate
April Weather	3°C (39°F)	43 mm (1.7 inches)	81%	high
May Weather	13°C (55°F)	54 mm (2.1 inches)	75%	very high
June Weather	20°C (68°F)	93 mm (3.7 inches)	79%	very high
July Weather	22°C (71°F)	62 mm (2.4 inches)	76%	very high
August Weather	20°C (68°F)	69 mm (2.7 inches)	78%	very high
September Weather	15°C (59°F)	84 mm (3.3 inches)	77%	high
October Weather	6°C (43°F)	81 mm (3.2 inches)	79%	moderate
November Weather	-3°C (26°F)	29 mm (1.1 inches)	86%	low
December Weather	-9°C (16°F)	38 mm (1.5 inches)	86%	low