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August Weather in Riley, United States

Last updated: June 24, 2025

In Riley, United States, the average temperature in August is a pleasant 25°C (78°F). Visitors can expect a range from a cool 12°C (55°F) to a warm 37°C (99°F). While enjoying the warmth, be prepared for 119 mm (4.7 in) of precipitation over 9 days, contributing to an average humidity of 78%.

August Temperature in Riley

In August in Riley, the average temperature is 25°C (78°F). Maximum temperatures can reach up to 37°C (99°F), while minimums can drop as low as 12°C (55°F). Therefore, it's a great time to visit Riley if you enjoy warm weather with the possibility of cooler evenings.

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

The chart illustrates August temperature patterns in Riley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Riley, August typically has an average temperature of 25°C (78°F), with highs reaching up to 37°C (99°F) and lows dropping to around 12°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec313246546678817773574437
Data source: Temperature data for Riley 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 Riley

In Riley in August, the precipitation amount is 119 mm (4.7 in) occurring over a span of 9 days.

August Precipitation Trends in Riley

The chart displays monthly precipitation patterns in Riley, 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 Riley, August typically receives around 119 mm (4.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec30288467185798011964983327
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Riley

In Riley in August humidity is 78%. With an average temperature of 25°C (78°F), this humidity feels like walking through a warm, thick blanket, making every step feel heavier and the air noticeably sticky, which can be quite challenging for traveling.

August Average Humidity in Riley

This chart illustrates the average monthly humidity levels in Riley, 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 Riley is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%70%73%82%82%81%78%71%71%81%84%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Riley

In Riley 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 Riley.

Maximum UV Index Levels in Riley for August

The chart shows the monthly maximum UV Index (UVI) for Riley 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 Riley typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
Data source: Riley 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 Riley Compares to Other Months

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

This table compares monthly weather conditions in Riley, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)30 mm (1.2 inches)76%moderate
February Weather0°C (32°F)28 mm (1.1 inches)77%moderate
March Weather8°C (46°F)84 mm (3.3 inches)70%high
April Weather12°C (55°F)67 mm (2.6 inches)73%very high
May Weather19°C (66°F)185 mm (7.3 inches)82%very high
June Weather26°C (79°F)79 mm (3.1 inches)82%extreme
July Weather27°C (81°F)80 mm (3.1 inches)81%extreme
August Weather25°C (78°F)119 mm (4.7 inches)78%very high
September Weather23°C (73°F)64 mm (2.5 inches)71%very high
October Weather14°C (57°F)98 mm (3.9 inches)71%high
November Weather7°C (44°F)33 mm (1.3 inches)81%moderate
December Weather3°C (37°F)27 mm (1.0 inches)84%moderate

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