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April Weather in Janesville, United States

Last updated: June 24, 2025

In April, the average temperature in Janesville, United States hovers around 8°C (46°F). Temperatures can swing significantly, with a low of -11°C (12°F) and a high of 27°C (80°F). Be prepared for some rain, as the region experiences about 43 mm (1.7 in) of precipitation over 8 days. With an average humidity level of 83%, it’s a good idea to dress in layers!

April Temperature in Janesville

In April in Janesville, the average temperature is 8°C (46°F), with maximums reaching 27°C (80°F) and minimums dropping as low as -11°C (12°F). Be prepared for a wide range of temperatures to ensure a comfortable and enjoyable trip.

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

The chart illustrates April temperature patterns in Janesville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Janesville, April typically has an average temperature of 8°C (46°F), with highs reaching up to 27°C (80°F) and lows dropping to around -11°C (12°F).
JanFebMarAprMayJunJulAugSepOctNovDec313236465466747263504030
Data source: Temperature data for Janesville 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 Janesville

In Janesville in April, the total precipitation amount is 43 mm (1.7 in) over the course of 8 days.

April Precipitation Trends in Janesville

The chart displays monthly precipitation patterns in Janesville, 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 Janesville, April typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec102110854344107819344775
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Janesville

In Janesville in April, humidity is 83%. With an average temperature of 8°C (46°F), this humidity feels like a damp chill that seeps into your bones, making even short outings feel quite uncomfortable and prompting travelers to bundle up and seek shelter more frequently.

April Average Humidity in Janesville

This chart illustrates the average monthly humidity levels in Janesville, 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 Janesville is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%87%86%83%72%67%56%42%46%67%86%86%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Janesville

In Janesville in April, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Janesville.

Maximum UV Index Levels in Janesville for April

The chart shows the monthly maximum UV Index (UVI) for Janesville 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 Janesville typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4589111211119743
Data source: Janesville 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 Janesville Compares to Other Months

Weather in Janesville varies notably across the year, with each month offering distinct climate conditions. This page compares April’s weather to other months in Janesville, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Janesville, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)102 mm (4.0 inches)86%moderate
February Weather0°C (32°F)110 mm (4.3 inches)87%moderate
March Weather2°C (37°F)85 mm (3.4 inches)86%very high
April Weather8°C (46°F)43 mm (1.7 inches)83%very high
May Weather12°C (55°F)44 mm (1.7 inches)72%extreme
June Weather19°C (66°F)10 mm (0.4 inches)67%extreme
July Weather23°C (74°F)7 mm (0.3 inches)56%extreme
August Weather22°C (72°F)8 mm (0.3 inches)42%extreme
September Weather17°C (63°F)19 mm (0.7 inches)46%very high
October Weather10°C (50°F)34 mm (1.3 inches)67%high
November Weather4°C (40°F)47 mm (1.8 inches)86%moderate
December Weather-1°C (31°F)75 mm (3.0 inches)86%moderate

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