August Weather in Onalaska, United States

Last updated: June 24, 2025

In August, the average temperature in Onalaska, United States is a pleasant 21°C (70°F), where the thermometer can dip to a cool 11°C (51°F) and soar up to a warm 34°C (93°F). Expect about 127 mm (5.0 in) of precipitation spread over 11 days, while the average humidity sits at a comfortable 69%. Embrace the diverse weather this month brings!

August Temperature in Onalaska

In August in Onalaska, the average temperature is 21°C (70°F), with maximums reaching 34°C (93°F) and minimums dipping as low as 11°C (51°F). This pleasant weather makes it an ideal time for outdoor activities and exploration.

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 21°C (70°F), with highs reaching up to 34°C (93°F) and lows dropping to around 11°C (51°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 127 mm (5.0 in), occurring over 11 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 127 mm (5.0 inches) of precipitation spread over approximately 11 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 69%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making outdoor activities enjoyable but requiring occasional breaks for hydration and shade during your travels.

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 69%, 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 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 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 9, 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	-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