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April Weather in Rialto, United States

Last updated: June 24, 2025

In Rialto, United States, the average temperature in April hovers around 16°C (61°F). Expect temperature variations, with minimums reaching 4°C (39°F) and juicy maximums soaring to 33°C (92°F). During this month, you'll encounter a modest precipitation amount of 31 mm (1.2 in) spread over about 3 days. With an average humidity level of 56%, it's a perfect time to enjoy the climate!

April Temperature in Rialto

In April in Rialto, the average temperature is 16°C (61°F). Maximum temperatures can reach 33°C (92°F), while the minimum can drop as low as 4°C (39°F). This variation makes Rialto a great destination for travelers looking to experience both warm and cool weather.

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

The chart illustrates April temperature patterns in Rialto, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rialto, April typically has an average temperature of 16°C (61°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec515154606472787874665951
Data source: Temperature data for Rialto 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 Rialto

In Rialto in April, the precipitation amount is 31 mm (1.2 in) over the course of 3 days.

April Precipitation Trends in Rialto

The chart displays monthly precipitation patterns in Rialto, 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 Rialto, April typically receives around 31 mm (1.2 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec70707531183111010112870
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Rialto

In Rialto in April, humidity is 56%. With an average temperature of 16°C (61°F), this humidity feels like a pleasant embrace, making it an ideal time for traveling as the mild conditions invite leisurely strolls and outdoor exploration.

April Average Humidity in Rialto

This chart illustrates the average monthly humidity levels in Rialto, 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 Rialto is approximately 56%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%77%67%56%46%48%46%42%52%58%66%74%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Rialto

In Rialto 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 Rialto.

Maximum UV Index Levels in Rialto for April

The chart shows the monthly maximum UV Index (UVI) for Rialto 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 Rialto typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101112121110854
Data source: Rialto 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 Rialto Compares to Other Months

Weather in Rialto varies notably across the year, with each month offering distinct climate conditions. This page compares April’s weather to other months in Rialto, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Rialto, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (51°F)70 mm (2.8 inches)72%moderate
February Weather11°C (52°F)70 mm (2.7 inches)77%high
March Weather12°C (54°F)75 mm (2.9 inches)67%very high
April Weather16°C (61°F)31 mm (1.2 inches)56%very high
May Weather18°C (64°F)18 mm (0.7 inches)46%extreme
June Weather22°C (72°F)3 mm (0.1 inches)48%extreme
July Weather26°C (78°F)11 mm (0.4 inches)46%extreme
August Weather26°C (79°F)10 mm (0.4 inches)42%extreme
September Weather23°C (74°F)10 mm (0.4 inches)52%very high
October Weather19°C (66°F)11 mm (0.4 inches)58%very high
November Weather15°C (59°F)28 mm (1.1 inches)66%moderate
December Weather11°C (51°F)70 mm (2.7 inches)74%moderate

Compare Rialto's Climate with Cities Worldwide