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August Weather in Janesville, United States

Last updated: June 24, 2025

In August, the average temperature in Janesville, United States hovers around 22°C (72°F). Expect a refreshing range, with minimums dipping to 7°C (46°F) and maximums soaring to 36°C (98°F). While you'll enjoy plenty of sunshine, precipitation is minimal, totaling just 8 mm (0.3 in) over 3 days. Don't forget to stay hydrated, as the average humidity sits at a comfortable 42%!

August Temperature in Janesville

In August in Janesville, the average temperature is 22°C (72°F), with maximums reaching up to 36°C (98°F) and minimums dipping as low as 7°C (46°F). This range makes Janesville an ideal destination for travelers seeking a mix of warm days and cooler evenings.

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

The chart illustrates August 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, August typically has an average temperature of 22°C (72°F), with highs reaching up to 36°C (98°F) and lows dropping to around 7°C (46°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.

August Precipitation in Janesville

In Janesville in August, the precipitation amount is 8 mm (0.3 in) over the course of 3 days.

August Precipitation Trends in Janesville

The chart displays monthly precipitation patterns in Janesville, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Janesville, August typically receives around 8 mm (0.3 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec102110854344107819344775
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Janesville

In Janesville in August, humidity is 42%. With an average temperature of 22°C (72°F), this humidity feels like a pleasant embrace, making it comfortable for exploring the sights and enjoying outdoor activities without feeling overly sticky or heavy in the air.

August Average Humidity in Janesville

This chart illustrates the average monthly humidity levels in Janesville, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Janesville is approximately 42%, 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 August generated using information from the Copernicus Climate Change Service.

August UV Index in Janesville

In Janesville in August, 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 Janesville.

Maximum UV Index Levels in Janesville for August

The chart shows the monthly maximum UV Index (UVI) for Janesville in August, 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 August, the maximum UV index in Janesville typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4589111211119743
Data source: Janesville August 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 August 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 August’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 August’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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