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