nomadseason

May Weather in Riverside, United States

Last updated: June 24, 2025

In May, the average temperature in Riverside, United States hovers around 22°C (72°F), offering a mild climate. Temperatures can fluctuate significantly, dipping as low as 6°C (43°F) and reaching a warm 33°C (93°F). Visitors should be prepared for some rain, as 104 mm (4.1 in) of precipitation typically falls over 10 days. With an average humidity of 81%, the air tends to feel quite moist, contributing to the region’s lush atmosphere.

May Temperature in Riverside

In May in Riverside, the average temperature is 22°C (72°F). Maximum temperatures can reach 33°C (93°F), while minimums can drop as low as 6°C (43°F). This variability makes it essential for travelers to pack layers to accommodate both warm days and cooler evenings.

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 22°C (72°F), with highs reaching up to 33°C (93°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec465258637277807976675349
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 is 104 mm (4.1 in) over a period of 10 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 104 mm (4.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec1191611341431041421101308712086144
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 81%. With an average temperature of 22°C (72°F), this humidity feels like a warm, enveloping blanket, making traveling feel both lush and a bit stifling, as the air clings to your skin and every step is accompanied by a gentle sheen of moisture.

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 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%81%77%77%72%73%73%85%88%
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 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111109764
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 Weather8°C (47°F)119 mm (4.7 inches)85%moderate
February Weather11°C (52°F)161 mm (6.3 inches)84%high
March Weather14°C (58°F)134 mm (5.3 inches)82%very high
April Weather17°C (63°F)143 mm (5.6 inches)82%very high
May Weather22°C (72°F)104 mm (4.1 inches)81%extreme
June Weather25°C (77°F)142 mm (5.6 inches)77%extreme
July Weather27°C (80°F)110 mm (4.3 inches)77%extreme
August Weather26°C (80°F)130 mm (5.1 inches)72%very high
September Weather25°C (76°F)87 mm (3.4 inches)73%very high
October Weather19°C (67°F)120 mm (4.7 inches)73%high
November Weather12°C (53°F)86 mm (3.4 inches)85%high
December Weather10°C (50°F)144 mm (5.7 inches)88%moderate

Compare Riverside's Climate with Cities Worldwide