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August Weather in Alton, United States

Last updated: June 24, 2025

In Alton, United States, the average temperature in August hovers around 25°C (77°F). Be prepared for a range, as temperatures can dip to a minimum of 14°C (57°F) and soar to a maximum of 36°C (97°F). During this month, you can expect approximately 106 mm (4.2 in) of precipitation over 12 days, with an average humidity level of 69%.

August Temperature in Alton

In August in Alton, the average temperature is 25°C (77°F), with maximums reaching 36°C (97°F) and minimums dropping to as low as 14°C (57°F). It's a great time to visit for those who enjoy warm weather with occasional cooler evenings.

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

The chart illustrates August temperature patterns in Alton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alton, August typically has an average temperature of 25°C (77°F), with highs reaching up to 36°C (97°F) and lows dropping to around 14°C (57°F).
JanFebMarAprMayJunJulAugSepOctNovDec363950566775807773604642
Data source: Temperature data for Alton 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 Alton

In Alton in August, the precipitation amount is 106 mm (4.2 in), occurring over a span of 12 days.

August Precipitation Trends in Alton

The chart displays monthly precipitation patterns in Alton, 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 Alton, August typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec851111481641818580107621217781
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Alton

In Alton in August humidity is 69%. With an average temperature of 25°C (77°F), this humidity feels like a warm, heavy blanket enveloping you, making every step feel slightly sluggish and encouraging frequent breaks to enjoy refreshing beverages and cool breezes.

August Average Humidity in Alton

This chart illustrates the average monthly humidity levels in Alton, 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 Alton is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%81%80%80%83%83%76%69%68%72%83%87%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Alton

In Alton in August, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Alton.

Maximum UV Index Levels in Alton for August

The chart shows the monthly maximum UV Index (UVI) for Alton 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 Alton typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710111111109753
Data source: Alton 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 Alton Compares to Other Months

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

This table compares monthly weather conditions in Alton, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)85 mm (3.3 inches)83%moderate
February Weather4°C (40°F)111 mm (4.4 inches)81%high
March Weather10°C (50°F)148 mm (5.8 inches)80%high
April Weather13°C (56°F)164 mm (6.5 inches)80%very high
May Weather19°C (67°F)181 mm (7.1 inches)83%extreme
June Weather24°C (76°F)85 mm (3.3 inches)83%extreme
July Weather26°C (80°F)80 mm (3.2 inches)76%extreme
August Weather25°C (77°F)106 mm (4.2 inches)69%very high
September Weather23°C (73°F)62 mm (2.4 inches)68%very high
October Weather16°C (60°F)121 mm (4.8 inches)72%high
November Weather8°C (47°F)77 mm (3.0 inches)83%moderate
December Weather6°C (42°F)81 mm (3.2 inches)86%moderate

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