August Weather in Onalaska, United States

Last updated: June 24, 2025

In August, the average temperature in Onalaska, United States reaches a warm 29°C (84°F). Expect a minimum of 21°C (70°F) and occasional highs hitting 38°C (100°F). With 152 mm (6.0 in) of precipitation spread over 14 days, humidity levels average around 67%, adding a touch of tropical feel to the atmosphere. Enjoy the warmth while staying prepared for those fleeting showers!

August Temperature in Onalaska

In August in Onalaska, the average temperature is 29°C (84°F), with maximums reaching up to 38°C (100°F) and minimums dipping as low as 21°C (70°F). This climate makes it an ideal time for travelers looking to enjoy warm weather and outdoor activities.

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 29°C (84°F), with highs reaching up to 38°C (100°F) and lows dropping to around 21°C (70°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 152 mm (6.0 in) over a span of 14 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 152 mm (6.0 inches) of precipitation spread over approximately 14 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 67%. With an average temperature of 29°C (84°F), this humidity feels like walking through a warm, damp blanket that clings to your skin, making outdoor activities a bit more strenuous and necessitating plenty of water breaks for a comfortable travel experience.

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 67%, 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 reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme 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	11°C (52°F)	107 mm (4.2 inches)	79%	moderate
February Weather	13°C (55°F)	112 mm (4.4 inches)	80%	very high
March Weather	17°C (64°F)	97 mm (3.8 inches)	78%	very high
April Weather	20°C (68°F)	115 mm (4.5 inches)	79%	extreme
May Weather	24°C (76°F)	174 mm (6.8 inches)	81%	extreme
June Weather	27°C (82°F)	135 mm (5.3 inches)	77%	extreme
July Weather	28°C (84°F)	90 mm (3.5 inches)	71%	extreme
August Weather	29°C (84°F)	152 mm (6.0 inches)	67%	extreme
September Weather	27°C (80°F)	137 mm (5.4 inches)	69%	very high
October Weather	22°C (71°F)	117 mm (4.6 inches)	73%	very high
November Weather	16°C (60°F)	71 mm (2.8 inches)	82%	high
December Weather	13°C (56°F)	111 mm (4.4 inches)	87%	moderate