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August Weather in Collinsville, United States

Last updated: June 24, 2025

In August, the average temperature in Collinsville, United States is a warm 29°C (84°F). Expect a minimum of 19°C (66°F) and highs reaching up to 40°C (104°F). During this month, precipitation averages around 94 mm (3.7 in) over about 8 days, coupled with an average humidity level of 66%. Enjoy the summer vibes while staying prepared for occasional rain!

August Temperature in Collinsville

In August in Collinsville, the average temperature is 29°C (84°F). Maximum temperatures can reach 40°C (104°F), while minimums can drop to as low as 19°C (66°F). Be prepared for a warm climate, perfect for outdoor activities and exploring the local sights.

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

The chart illustrates August temperature patterns in Collinsville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Collinsville, August typically has an average temperature of 29°C (84°F), with highs reaching up to 40°C (104°F) and lows dropping to around 19°C (66°F).
JanFebMarAprMayJunJulAugSepOctNovDec454758637380848378665550
Data source: Temperature data for Collinsville 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 Collinsville

In Collinsville in August, the precipitation amount is 94 mm (3.7 in) over the course of 8 days.

August Precipitation Trends in Collinsville

The chart displays monthly precipitation patterns in Collinsville, 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 Collinsville, August typically receives around 94 mm (3.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec578811510613910548941211435359
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Collinsville

In Collinsville in August, humidity is 66%. With an average temperature of 29°C (84°F), this humidity feels like a warm and sticky embrace that can make outdoor activities quite uncomfortable, often prompting travelers to seek shade or relief in air-conditioned spaces.

August Average Humidity in Collinsville

This chart illustrates the average monthly humidity levels in Collinsville, 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 Collinsville is approximately 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%87%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Collinsville

In Collinsville 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 Collinsville.

Maximum UV Index Levels in Collinsville for August

The chart shows the monthly maximum UV Index (UVI) for Collinsville 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 Collinsville typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
Data source: Collinsville 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 Collinsville Compares to Other Months

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

This table compares monthly weather conditions in Collinsville, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)57 mm (2.2 inches)80%moderate
February Weather8°C (47°F)88 mm (3.5 inches)79%high
March Weather15°C (59°F)115 mm (4.5 inches)78%very high
April Weather17°C (64°F)106 mm (4.2 inches)78%very high
May Weather23°C (73°F)138 mm (5.5 inches)81%extreme
June Weather27°C (81°F)105 mm (4.1 inches)78%extreme
July Weather29°C (84°F)47 mm (1.9 inches)73%extreme
August Weather29°C (84°F)94 mm (3.7 inches)66%extreme
September Weather25°C (78°F)121 mm (4.7 inches)65%very high
October Weather19°C (66°F)143 mm (5.6 inches)72%very high
November Weather13°C (55°F)53 mm (2.1 inches)82%high
December Weather10°C (50°F)59 mm (2.3 inches)87%moderate

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