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April Weather in Riverside, United States

Last updated: June 24, 2025

In April, the average temperature in Riverside, United States hovers around 12°C (54°F). Expect temperature extremes, with minimums dipping to -8°C (19°F) and maximums peaking at 30°C (86°F). Prepare for some wet days, as 82 mm (3.2 in) of precipitation is expected over 10 days, coupled with an average humidity of 77%.

April Temperature in Riverside

In April in Riverside, the average temperature is 12°C (54°F). Maximum temperatures can reach 30°C (86°F), while minimums can drop as low as -8°C (19°F). Be prepared for a range of temperatures, making it important to pack layers for your travels.

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

The chart illustrates April 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, April typically has an average temperature of 12°C (54°F), with highs reaching up to 30°C (86°F) and lows dropping to around -8°C (19°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.

April Precipitation in Riverside

In Riverside in April, the total precipitation amount is 82 mm (3.2 in) observed over a span of 10 days.

April Precipitation Trends in Riverside

The chart displays monthly precipitation patterns in Riverside, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Riverside, April typically receives around 82 mm (3.2 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec5336948220792104117751124534
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Riverside

In Riverside in April, humidity is 77%. With an average temperature of 12°C (54°F), this humidity feels like a damp chill that wraps around you, making your travels a little more uncomfortable and requiring you to dress in layers to stay warm and dry.

April Average Humidity in Riverside

This chart illustrates the average monthly humidity levels in Riverside, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Riverside is approximately 77%, 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 April generated using information from the Copernicus Climate Change Service.

April UV Index in Riverside

In Riverside in April, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Riverside.

Maximum UV Index Levels in Riverside for April

The chart shows the monthly maximum UV Index (UVI) for Riverside in April, 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 April, the maximum UV index in Riverside typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
Data source: Riverside April 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 April 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 April’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 April’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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