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August Weather in Rock Island, United States

Last updated: June 24, 2025

In August, the average temperature in Rock Island, United States hovers around 29°C (84°F), with a minimum of 23°C (74°F) and a maximum reaching 34°C (94°F). However, be prepared for wet weather, as the area experiences an average precipitation of 227 mm (8.9 in) over 27 days, accompanied by a high average humidity of 80%. Stay hydrated and enjoy the warm, tropical climate!

August Temperature in Rock Island

In August in Rock Island, the average temperature is 29°C (84°F). The maximum can reach 34°C (94°F), while the minimum can be as low as 23°C (74°F). This pleasant weather makes Rock Island an ideal destination for travelers seeking warm and enjoyable conditions.

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

The chart illustrates August temperature patterns in Rock Island, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rock Island, August typically has an average temperature of 29°C (84°F), with highs reaching up to 34°C (94°F) and lows dropping to around 23°C (74°F).
JanFebMarAprMayJunJulAugSepOctNovDec687373777982838382817571
Data source: Temperature data for Rock Island 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 Island

In Rock Island in August, the total precipitation amount is 227 mm (8.9 in) over a span of 27 days.

August Precipitation Trends in Rock Island

The chart displays monthly precipitation patterns in Rock Island, 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 Island, August typically receives around 227 mm (8.9 inches) of precipitation spread over approximately 27 days.
JanFebMarAprMayJunJulAugSepOctNovDec304928781632372282272251467436
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Rock Island

In Rock Island in August, humidity is 80%. With an average temperature of 29°C (84°F), this humidity feels like a warm blanket enveloping you, making travel feel sticky and heavy, as sweat clings to your skin and every step requires extra effort.

August Average Humidity in Rock Island

This chart illustrates the average monthly humidity levels in Rock Island, 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 Island is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%80%75%68%65%73%77%80%83%83%83%84%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Rock Island

In Rock Island in August, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Rock Island.

Maximum UV Index Levels in Rock Island for August

The chart shows the monthly maximum UV Index (UVI) for Rock Island 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 Island typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec69101212121212111076
Data source: Rock Island 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 Island Compares to Other Months

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

This table compares monthly weather conditions in Rock Island, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather20°C (69°F)30 mm (1.2 inches)83%high
February Weather23°C (73°F)49 mm (1.9 inches)80%very high
March Weather23°C (73°F)28 mm (1.1 inches)75%very high
April Weather25°C (77°F)78 mm (3.1 inches)68%extreme
May Weather26°C (80°F)163 mm (6.4 inches)65%extreme
June Weather28°C (82°F)237 mm (9.3 inches)73%extreme
July Weather28°C (83°F)228 mm (9.0 inches)77%extreme
August Weather29°C (84°F)227 mm (8.9 inches)80%extreme
September Weather28°C (83°F)224 mm (8.8 inches)83%extreme
October Weather27°C (81°F)146 mm (5.8 inches)83%very high
November Weather24°C (75°F)74 mm (2.9 inches)83%high
December Weather21°C (71°F)36 mm (1.4 inches)84%high

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