nomadseason

May Weather in Riverside, United States

Last updated: June 24, 2025

In May, the average temperature in Riverside, United States hovers around 14°C (58°F). Temperatures can range from a chilly -2°C (29°F) to a warm 34°C (94°F). Expect about 43 mm (1.7 in) of precipitation spread over 9 days, while the air carries an average humidity of 66%.

May Temperature in Riverside

In May in Riverside, the average temperature is 14°C (58°F). Maximum temperatures can reach 34°C (94°F), while minimums can dip as low as -2°C (29°F). Travelers should be prepared for a wide range of weather conditions, from warm days to chilly nights.

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

The chart illustrates May temperature patterns in Riverside, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Riverside, May typically has an average temperature of 14°C (58°F), with highs reaching up to 34°C (94°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec273041485769787464473829
Data source: Temperature data for Riverside generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Riverside

In Riverside in May, the precipitation amount reaches 43 mm (1.7 in) over the course of 9 days.

May Precipitation Trends in Riverside

The chart displays monthly precipitation patterns in Riverside, 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 Riverside, May typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec32404037432071120292233
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

May Humidity in Riverside

In Riverside in May, humidity is 66%. With average temperature 14°C (58°F), this humidity feels like a damp chill that can make walking outdoors feel heavier, urging travelers to seek shelter or refreshment more often than usual.

May Average Humidity in Riverside

This chart illustrates the average monthly humidity levels in Riverside, 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 Riverside is approximately 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%92%85%76%66%62%53%42%46%64%83%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Riverside

In Riverside 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 Riverside.

Maximum UV Index Levels in Riverside for May

The chart shows the monthly maximum UV Index (UVI) for Riverside 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 Riverside typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3578101111109643
Data source: Riverside 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 Riverside Compares to Other Months

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

This table compares monthly weather conditions in Riverside, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)32 mm (1.3 inches)91%moderate
February Weather-1°C (31°F)40 mm (1.6 inches)92%moderate
March Weather5°C (41°F)40 mm (1.6 inches)85%high
April Weather9°C (48°F)37 mm (1.4 inches)76%very high
May Weather14°C (58°F)43 mm (1.7 inches)66%very high
June Weather20°C (69°F)20 mm (0.8 inches)62%extreme
July Weather25°C (78°F)7 mm (0.3 inches)53%extreme
August Weather24°C (75°F)11 mm (0.4 inches)42%very high
September Weather18°C (64°F)20 mm (0.8 inches)46%very high
October Weather8°C (48°F)29 mm (1.1 inches)64%high
November Weather3°C (38°F)22 mm (0.9 inches)83%moderate
December Weather-2°C (29°F)33 mm (1.3 inches)87%moderate

Compare Riverside's Climate with Cities Worldwide