April Weather in Onalaska, United States

Last updated: June 24, 2025

In April, the average temperature in Onalaska, United States is a pleasant 20°C (68°F). However, temperatures can range from a cool 6°C (44°F) to a warm 30°C (87°F). Expect about 115 mm (4.5 in) of precipitation over 11 days, with humidity hovering around 79% for a distinctive experience.

April Temperature in Onalaska

In April in Onalaska, the average temperature is 20°C (68°F). Maximums can reach 30°C (87°F) and minimums can be as low as 6°C (44°F). This pleasant range makes it an ideal time for outdoor activities and exploring the local attractions.

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

The chart illustrates April 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, April typically has an average temperature of 20°C (68°F), with highs reaching up to 30°C (87°F) and lows dropping to around 6°C (44°F).

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

April Precipitation in Onalaska

In Onalaska in April, the total precipitation amount is 115 mm (4.5 in) spread over 11 days.

April Precipitation Trends in Onalaska

The chart displays monthly precipitation patterns in Onalaska, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Onalaska, April typically receives around 115 mm (4.5 inches) of precipitation spread over approximately 11 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

April Humidity in Onalaska

In Onalaska in April humidity is 79%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that clings to the skin, making outdoor activities feel more strenuous and prompting the need for frequent breaks and hydration while traveling.

April Average Humidity in Onalaska

This chart illustrates the average monthly humidity levels in Onalaska, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Onalaska is approximately 79%, offering insight into how humid the weather typically is during this month.

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

April UV Index in Onalaska

In Onalaska in April, 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 April

The chart shows the monthly maximum UV Index (UVI) for Onalaska in April, 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 April, the maximum UV index in Onalaska typically reaches 11, which falls under the extreme exposure category.

Data source: Onalaska April 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 April 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 April’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 April’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