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May Weather in Riverside, United States

Last updated: June 24, 2025

In May, the average temperature in Riverside, United States is a pleasant 19°C (66°F), with temperatures ranging from a cool 3°C (39°F) to a warm 34°C (94°F). Expect 14 days of rain, accumulating around 207 mm (8.1 in) of precipitation, while the average humidity hovers around a high 82%.

May Temperature in Riverside

In May, in Riverside, the average temperature is 19°C (66°F). The maximum can reach 34°C (94°F), while the minimum can be as low as 3°C (39°F). This makes Riverside an ideal destination for travelers seeking a pleasant climate with varied temperatures.

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 19°C (66°F), with highs reaching up to 34°C (94°F) and lows dropping to around 3°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec303246546677797672574437
Data source: Temperature data for Riverside 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 Riverside

In Riverside in May, the total precipitation amount is 207 mm (8.1 in) over the course of 14 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 207 mm (8.1 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec5336948220792104117751124534
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Riverside

In Riverside 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 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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%78%75%77%82%83%81%78%72%72%84%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
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-1°C (31°F)53 mm (2.1 inches)80%moderate
February Weather0°C (32°F)36 mm (1.4 inches)78%moderate
March Weather8°C (46°F)94 mm (3.7 inches)75%high
April Weather12°C (54°F)82 mm (3.2 inches)77%very high
May Weather19°C (66°F)207 mm (8.1 inches)82%very high
June Weather25°C (77°F)92 mm (3.6 inches)83%extreme
July Weather26°C (80°F)104 mm (4.1 inches)81%extreme
August Weather25°C (77°F)117 mm (4.6 inches)78%very high
September Weather22°C (72°F)75 mm (2.9 inches)72%very high
October Weather14°C (57°F)112 mm (4.4 inches)72%high
November Weather6°C (44°F)45 mm (1.8 inches)84%moderate
December Weather3°C (37°F)34 mm (1.3 inches)86%moderate

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