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April Weather in Riverside, United States

Last updated: June 24, 2025

In April, the average temperature in Riverside, United States is a mild 17°C (63°F), though it can range from a chilly 1°C (33°F) to a warm 30°C (87°F). Be prepared for the possibility of rain, as the region experiences an average precipitation of 143 mm (5.6 in) over about 9 days. With an average humidity of 82%, you’ll definitely feel the moisture in the air!

April Temperature in Riverside

In April in Riverside, the average temperature is 17°C (63°F), with maximums reaching 30°C (87°F) and minimums dipping as low as 1°C (33°F). Be prepared for a diverse range of weather conditions when traveling during this time.

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 17°C (63°F), with highs reaching up to 30°C (87°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec465258637277807976675349
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 precipitation amount is 143 mm (5.6 in) over the course of 9 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 143 mm (5.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1191611341431041421101308712086144
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 82%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket wrapping around you—comfortable yet heavy, making outdoor activities more taxing and requiring frequent breaks for hydration.

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 82%, 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 April generated using information from the Copernicus Climate Change Service.

April UV Index in Riverside

In Riverside in April, 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 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111109764
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 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

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