Onalaska (WI) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Onalaska.
Climate overview of Onalaska
Temperatures in Onalaska, Wisconsin, United States of America, vary greatly throughout the year. July is the hottest month at 29°C (84°F), while January is the coldest at -3°C (27°F).
Onalaska sees a moderate amount of rain/snowfall, totalling around 955 mm (38 in) per year. It experiences a distinct dry season from January to February, with warm summers and very cold winters, creating some seasonal variation.
Onalaska Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Onalaska - and find the best time to visit.
Monthly Temperature in Onalaska
The climate in Onalaska is known for significant temperature differences throughout the year, making the weather dynamic. Average maximum daytime temperatures range from a comfortable 29°C (84°F) in July, the warmest time of the year, to a very cold -3°C (27°F) during cooler months like January.
At night, you can expect temperatures ranging from 18°C (64°F) in July to around -13°C (9°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Onalaska
Generally, Onalaska receives mid-range precipitation levels, with 955 mm (38 in) annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, June it receives high rainfall, averaging 146 mm (5.7 in) of precipitation, recorded across 13 rainy days. In contrast, the driest month January brings less snowfall, with 24 mm (0.9 in) over 8 snowy days. For more details, please visit our Onalaska Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Humidity in Onalaska by Month
The relative humidity is high throughout the year in Onalaska.
The city experiences its highest humidity in September, reaching 76%. In April, the humidity drops to its lowest level at 63%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Onalaska
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: July and September
- Warmest weather: July and August
- Fewer rainy days: January, February, March, October and November
- Wettest months: April, May, June, July, August and September, when rainfall is highest.
- Seasonal pattern: A distinct dry season from January to February, with warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -13°C (9°F).
Frequently asked questions about the climate in Onalaska
What is the best time to visit Onalaska?
July and September typically offer the most optimal weather in Onalaska. In contrast, January, February, March, November and December tend to have less optimal conditions. Onalaska has a distinct dry season from January to February, with warm summers and very cold winters.
What temperatures can I expect in Onalaska?
Daytime highs range from -3°C (27°F) in January to 29°C (84°F) in July. Nighttime lows range from -13°C (9°F) to 18°C (64°F). Temperatures vary considerably through the year.
How much rain does Onalaska get?
Annual rainfall is around 955 mm (38 in). June is the wettest month with 146 mm (5.7 in), while January is the driest with 24 mm (0.9 in).
Onalaska 3-Day Forecast
Onalaska (WI) 3-Day Forecast
Onalaska on the map
Onalaska is highlighted - select any city to see its climate.
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