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May Weather in Riley, United States

Last updated: June 24, 2025

In May, the average temperature in Riley, United States hovers around 19°C (66°F), with variations ranging from a chilly 3°C (38°F) to a sizzling 37°C (99°F). Expect 185 mm (7.3 in) of precipitation spread over approximately 14 days, contributing to an average humidity of 82%—perfect for those who enjoy a moist, tropical atmosphere!

May Temperature in Riley

In May in Riley, the average temperature is 19°C (66°F). Maximums can reach 37°C (99°F), while minimums can drop to as low as 3°C (38°F). This variation in temperature makes Riley an ideal destination for travelers seeking both warmth and cooler evenings.

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

The chart illustrates May 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, May typically has an average temperature of 19°C (66°F), with highs reaching up to 37°C (99°F) and lows dropping to around 3°C (38°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.

May Precipitation in Riley

In Riley in May, the precipitation amount is 185 mm (7.3 in) over a span of 14 days.

May Precipitation Trends in Riley

The chart displays monthly precipitation patterns in Riley, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Riley, May typically receives around 185 mm (7.3 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec30288467185798011964983327
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Riley

In Riley in May humidity is 82%. With an average temperature of 19°C (66°F), this humidity feels like a warm blanket wrapping around you, making it slightly uncomfortable for traveling as you might find yourself constantly seeking shade or a cool breeze.

May Average Humidity in Riley

This chart illustrates the average monthly humidity levels in Riley, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Riley is approximately 82%, 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 May generated using information from the Copernicus Climate Change Service.

May UV Index in Riley

In Riley in May, 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 May

The chart shows the monthly maximum UV Index (UVI) for Riley in May, 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 May, the maximum UV index in Riley typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
Data source: Riley May 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 May 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 May’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 May’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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