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August Weather in Rock Falls, United States

Last updated: June 24, 2025

In August, the average temperature in Rock Falls, United States is a comfortable 23°C (73°F), making it an inviting time to visit. However, be prepared for temperature fluctuations, as it can drop to a chilly 11°C (53°F) at night or soar up to a warm 35°C (94°F) during the day. Expect some moisture in the air, with an average humidity of 81% and around 73 mm (2.9 in) of precipitation over 9 days. Plan accordingly for a delightful trip!

August Temperature in Rock Falls

In August in Rock Falls, the average temperature is 23°C (73°F), with maximums reaching 35°C (94°F) and minimums dipping as low as 11°C (53°F). This pleasant climate makes it an ideal time for outdoor activities and exploration.

August Weather in Rock Falls: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Rock Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rock Falls, August typically has an average temperature of 23°C (73°F), with highs reaching up to 35°C (94°F) and lows dropping to around 11°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec232640496273767368543932
Data source: Temperature data for Rock Falls 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 Rock Falls

In Rock Falls in August, the precipitation amount is 73 mm (2.9 in), occurring over the course of 9 days.

August Precipitation Trends in Rock Falls

The chart displays monthly precipitation patterns in Rock Falls, 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 Rock Falls, August typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec59598611015714198731151155250
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Rock Falls

In Rock Falls in August, humidity is 81%. With an average temperature of 23°C (73°F), this humidity feels like a heavy blanket wrapping around you, making every step feel more laborious while traveling and causing you to constantly seek out shade or a cool breeze for relief.

August Average Humidity in Rock Falls

This chart illustrates the average monthly humidity levels in Rock Falls, 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 Rock Falls is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Rock Falls

In Rock Falls 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 Rock Falls.

Maximum UV Index Levels in Rock Falls for August

The chart shows the monthly maximum UV Index (UVI) for Rock Falls 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 Rock Falls typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689101098642
Data source: Rock Falls 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 Rock Falls Compares to Other Months

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

This table compares monthly weather conditions in Rock Falls, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)59 mm (2.3 inches)82%moderate
February Weather-3°C (26°F)59 mm (2.3 inches)83%moderate
March Weather4°C (40°F)86 mm (3.4 inches)84%high
April Weather9°C (49°F)110 mm (4.3 inches)85%very high
May Weather17°C (62°F)157 mm (6.2 inches)79%very high
June Weather23°C (73°F)141 mm (5.6 inches)82%very high
July Weather24°C (76°F)98 mm (3.8 inches)80%very high
August Weather23°C (73°F)73 mm (2.9 inches)81%very high
September Weather20°C (68°F)115 mm (4.5 inches)80%very high
October Weather12°C (54°F)115 mm (4.5 inches)82%high
November Weather4°C (39°F)51 mm (2.0 inches)88%moderate
December Weather0°C (32°F)50 mm (2.0 inches)84%low

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