May Weather in Onalaska, United States

Last updated: June 24, 2025

In May, the average temperature in Onalaska, United States hovers around 15°C (59°F), making it a comfortable month to explore. However, be prepared for a range of temperatures, with minimums dipping to 0°C (32°F) and maximums climbing as high as 35°C (96°F). Expect an average precipitation of 142 mm (5.6 in) over 14 days, coupled with a relative humidity of 75%, so don’t forget to pack your umbrella!

May Temperature in Onalaska

In May in Onalaska, the average temperature is 15°C (59°F). The maximum can reach 35°C (96°F), while the minimum can drop as low as 0°C (32°F). It’s advisable to pack layers and prepare for a range of temperatures when traveling to Onalaska during this time.

May Weather in Onalaska: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Onalaska, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Onalaska, May typically has an average temperature of 15°C (59°F), with highs reaching up to 35°C (96°F) and lows dropping to around 0°C (32°F).

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

May Precipitation in Onalaska

In Onalaska in May, the precipitation amount is 142 mm (5.6 in) occurring over a span of 14 days.

May Precipitation Trends in Onalaska

The chart displays monthly precipitation patterns in Onalaska, 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 Onalaska, May typically receives around 142 mm (5.6 inches) of precipitation spread over approximately 14 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

May Humidity in Onalaska

In Onalaska in May, humidity is 75%. With an average temperature of 15°C (59°F), this humidity feels like a warm blanket enveloping you, making it feel more oppressive than refreshing, which can be a challenge for travelers seeking comfort while exploring the area.

May Average Humidity in Onalaska

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

In Onalaska in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Onalaska.

Maximum UV Index Levels in Onalaska for May

The chart shows the monthly maximum UV Index (UVI) for Onalaska 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 Onalaska typically reaches 9, which falls under the very high exposure category.

Data source: Onalaska 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 Onalaska Compares to Other Months

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

This table compares monthly weather conditions in Onalaska, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (19°F)	35 mm (1.4 inches)	84%	low
February Weather	-7°C (20°F)	49 mm (1.9 inches)	85%	moderate
March Weather	2°C (35°F)	57 mm (2.2 inches)	84%	moderate
April Weather	7°C (45°F)	86 mm (3.4 inches)	83%	very high
May Weather	15°C (59°F)	142 mm (5.6 inches)	75%	very high
June Weather	21°C (71°F)	139 mm (5.5 inches)	79%	very high
July Weather	23°C (74°F)	101 mm (4.0 inches)	75%	very high
August Weather	21°C (70°F)	127 mm (5.0 inches)	69%	very high
September Weather	18°C (64°F)	109 mm (4.3 inches)	74%	high
October Weather	10°C (50°F)	118 mm (4.6 inches)	79%	moderate
November Weather	2°C (35°F)	53 mm (2.1 inches)	88%	moderate
December Weather	-3°C (26°F)	44 mm (1.7 inches)	82%	low