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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 9°C (48°F). Expect a range from a brisk -6°C (21°F) to a warm 28°C (83°F). With 37 mm (1.4 in) of precipitation spread over 9 days, it's wise to be prepared for some wet weather. The average humidity stands at a cozy 76%, creating a unique climate experience in this picturesque locale.

April Temperature in Riverside

In April in Riverside, the average temperature is 9°C (48°F), with maximums reaching 28°C (83°F) and minimums dropping as low as -6°C (21°F). Travelers should be prepared for a wide range of temperatures when visiting 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 9°C (48°F), with highs reaching up to 28°C (83°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec273041485769787464473829
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 37 mm (1.4 in) spread across 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 37 mm (1.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec32404037432071120292233
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 76%. With an average temperature of 9°C (48°F), this humidity feels like a chilly embrace, making outdoor activities feel damp and brisk, potentially leaving you feeling colder than the temperature suggests.

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 76%, 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 April generated using information from the Copernicus Climate Change Service.

April UV Index in Riverside

In Riverside in April, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3578101111109643
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-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

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