August Weather in Onalaska, United States

Last updated: June 24, 2025

In Onalaska, United States, the average temperature for August is a pleasant 19°C (66°F). However, you can expect a range of temperatures, with a minimum dipping to 8°C (46°F) and a maximum soaring up to 37°C (98°F). Be prepared for some rain, as the area typically sees 15 mm (0.6 in) of precipitation over 3 days. With an average humidity of 73%, you'll want to stay hydrated and comfortable!

August Temperature in Onalaska

In August in Onalaska, the average temperature is 19°C (66°F), with maximums reaching 37°C (98°F) and minimums dipping as low as 8°C (46°F). It's a great time for travelers to enjoy a range of outdoor activities while being prepared for varying temperatures.

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

The chart illustrates August 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, August typically has an average temperature of 19°C (66°F), with highs reaching up to 37°C (98°F) and lows dropping to around 8°C (46°F).

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

August Precipitation in Onalaska

In Onalaska in August, the precipitation amount is 15 mm (0.6 in) over the course of 3 days.

August Precipitation Trends in Onalaska

The chart displays monthly precipitation patterns in Onalaska, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Onalaska, August typically receives around 15 mm (0.6 inches) of precipitation spread over approximately 3 days.

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

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Millimeters (mm) Inches (in)

August Humidity in Onalaska

In Onalaska in August humidity is 73%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, making travel enjoyable yet slightly sticky, as you find yourself seeking shade and refreshing drinks while exploring.

August Average Humidity in Onalaska

This chart illustrates the average monthly humidity levels in Onalaska, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Onalaska is approximately 73%, offering insight into how humid the weather typically is during this month.

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

August UV Index in Onalaska

In Onalaska in August, 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 Onalaska.

Maximum UV Index Levels in Onalaska for August

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

Data source: Onalaska August 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 August 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 August’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 August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	188 mm (7.4 inches)	86%	low
February Weather	4°C (39°F)	196 mm (7.7 inches)	84%	moderate
March Weather	6°C (44°F)	151 mm (5.9 inches)	85%	moderate
April Weather	9°C (49°F)	129 mm (5.1 inches)	83%	high
May Weather	13°C (55°F)	80 mm (3.2 inches)	84%	very high
June Weather	15°C (60°F)	62 mm (2.4 inches)	84%	very high
July Weather	18°C (65°F)	12 mm (0.5 inches)	82%	very high
August Weather	19°C (66°F)	15 mm (0.6 inches)	73%	very high
September Weather	16°C (60°F)	86 mm (3.4 inches)	74%	high
October Weather	10°C (50°F)	149 mm (5.9 inches)	83%	moderate
November Weather	7°C (44°F)	187 mm (7.3 inches)	86%	moderate
December Weather	4°C (40°F)	202 mm (8.0 inches)	87%	low