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April Weather in Onalaska, United States

Last updated: June 24, 2025

In April, the average temperature in Onalaska, United States hovers around 9°C (49°F), offering a cool atmosphere. Expect temperature fluctuations with a minimum of -1°C (30°F) and a maximum of 28°C (84°F). Be prepared for rain, as 129 mm (5.1 in) of precipitation is typical over 16 days. With an average humidity of 83%, it's a moist time of year, perfect for enjoying the unique charm of the season.

April Temperature in Onalaska

In April in Onalaska, the average temperature is 9°C (49°F). Maximum temperatures can reach 28°C (84°F), while minimums can drop as low as -1°C (30°F). It's an ideal time to experience a range of weather, so travelers should pack accordingly to enjoy all that Onalaska has to offer.

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 9°C (49°F), with highs reaching up to 28°C (84°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec403944485560646660504440
Data source: Temperature data for Onalaska generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

April Precipitation in Onalaska

In Onalaska in April, the total precipitation amount is 129 mm (5.1 in), recorded over a span of 16 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 129 mm (5.1 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec1881961511298062121586149187202
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Onalaska

In Onalaska in April, humidity is 83%. With an average temperature of 9°C (49°F), this humidity feels like a damp blanket wrapping around you, making outdoor activities uncomfortable for traveling and requiring extra layers to stay warm and dry.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%85%83%84%84%82%73%74%83%86%87%
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 is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Onalaska, you can refer to this 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 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2356910987532
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.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)188 mm (7.4 inches)86%low
February Weather4°C (39°F)196 mm (7.7 inches)84%moderate
March Weather6°C (44°F)151 mm (5.9 inches)85%moderate
April Weather9°C (49°F)129 mm (5.1 inches)83%high
May Weather13°C (55°F)80 mm (3.2 inches)84%very high
June Weather15°C (60°F)62 mm (2.4 inches)84%very high
July Weather18°C (65°F)12 mm (0.5 inches)82%very high
August Weather19°C (66°F)15 mm (0.6 inches)73%very high
September Weather16°C (60°F)86 mm (3.4 inches)74%high
October Weather10°C (50°F)149 mm (5.9 inches)83%moderate
November Weather7°C (44°F)187 mm (7.3 inches)86%moderate
December Weather4°C (40°F)202 mm (8.0 inches)87%low

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