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October Weather in Riverside, United States

Last updated: June 24, 2025

In October, the average temperature in Riverside, United States typically hovers around 19°C (67°F). However, visitors should be prepared for a range of temperatures, with minimums plunging to 1°C (34°F) and maximums soaring up to 37°C (98°F). Rainfall makes its presence felt, bringing approximately 120 mm (4.7 in) across 9 days, while humidity levels linger around a steamy 73%.

October Temperature in Riverside

In October in Riverside, the average temperature is 19°C (67°F), with maximums reaching 37°C (98°F) and minimums dropping as low as 1°C (34°F). This varied climate makes Riverside an ideal destination for travelers seeking both warm days and cooler evenings.

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

The chart illustrates October 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, October typically has an average temperature of 19°C (67°F), with highs reaching up to 37°C (98°F) and lows dropping to around 1°C (34°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.

October Precipitation in Riverside

In Riverside in October, the precipitation amount is 120 mm (4.7 in) over the course of 9 days.

October Precipitation Trends in Riverside

The chart displays monthly precipitation patterns in Riverside, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Riverside, October typically receives around 120 mm (4.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1191611341431041421101308712086144
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Riverside

In Riverside in October humidity is 73%. With an average temperature of 19°C (67°F), this humidity feels like a warm blanket wrapped around you, making travel slightly uncomfortable and sticky, but still manageable as long as you stay hydrated and take breaks in the shade.

October Average Humidity in Riverside

This chart illustrates the average monthly humidity levels in Riverside, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Riverside is approximately 73%, 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 October generated using information from the Copernicus Climate Change Service.

October UV Index in Riverside

In Riverside in October, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Riverside.

Maximum UV Index Levels in Riverside for October

The chart shows the monthly maximum UV Index (UVI) for Riverside in October, 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 October, the maximum UV index in Riverside typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111109764
Data source: Riverside October 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 October 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 October’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 October’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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