August Weather in Janesville, United States

Last updated: June 24, 2025

In August, the average temperature in Janesville, United States hovers around 22°C (71°F). Daily temperatures can fluctuate significantly, with minimums dipping to 10°C (50°F) and maximums soaring to 35°C (96°F). Expect 113 mm (4.5 in) of precipitation spread over about 8 days, accompanied by an average humidity level of 77%, creating a uniquely humid atmosphere.

August Temperature in Janesville

In August in Janesville, the average temperature is 22°C (71°F). Maximums can reach 35°C (96°F), while minimums can be as low as 10°C (50°F). It's a great time to enjoy the pleasant weather while exploring the sights and experiences Janesville has to offer.

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 (71°F), with highs reaching up to 35°C (96°F) and lows dropping to around 10°C (50°F).

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

August Precipitation in Janesville

In Janesville in August, the precipitation amount is 113 mm (4.5 in) over the course of 8 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 113 mm (4.5 inches) of precipitation spread over approximately 8 days.

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

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Millimeters (mm) Inches (in)

August Humidity in Janesville

In Janesville in August, humidity is 77%. With an average temperature of 22°C (71°F), this humidity feels like a warm, enveloping blanket that can make walking around feel a bit stifling, requiring frequent breaks in shaded areas and plenty of hydration.

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 77%, offering insight into how humid the weather typically is during this month.

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 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 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 9, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (20°F)	40 mm (1.6 inches)	82%	moderate
February Weather	-7°C (20°F)	50 mm (2.0 inches)	84%	moderate
March Weather	2°C (36°F)	72 mm (2.8 inches)	80%	moderate
April Weather	8°C (47°F)	75 mm (2.9 inches)	81%	very high
May Weather	16°C (61°F)	161 mm (6.3 inches)	74%	very high
June Weather	22°C (72°F)	126 mm (5.0 inches)	80%	extreme
July Weather	24°C (75°F)	97 mm (3.8 inches)	80%	very high
August Weather	22°C (71°F)	113 mm (4.5 inches)	77%	very high
September Weather	19°C (66°F)	116 mm (4.6 inches)	75%	very high
October Weather	10°C (51°F)	132 mm (5.2 inches)	80%	moderate
November Weather	2°C (36°F)	48 mm (1.9 inches)	87%	moderate
December Weather	-2°C (29°F)	35 mm (1.4 inches)	83%	moderate