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October Weather in Fontana, United States

Last updated: June 24, 2025

In October, the average temperature in Fontana, United States hovers around 11°C (53°F), creating a mild climate. Expect temperatures to range from a brisk -5°C (23°F) to a warm 30°C (86°F). With an average precipitation of 119 mm (4.7 in) spread over 13 days, it's wise to keep an umbrella handy. The atmosphere is often quite damp, with an average humidity of 83%, adding to the overall coolness of the month.

October Temperature in Fontana

In October in Fontana, the average temperature is 11°C (53°F), with maximums reaching 30°C (86°F) and minimums dropping as low as -5°C (23°F). Be sure to pack layers to prepare for varying weather conditions during your visit.

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

The chart illustrates October temperature patterns in Fontana, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fontana, October typically has an average temperature of 11°C (53°F), with highs reaching up to 30°C (86°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec232537465970757266523731
Data source: Temperature data for Fontana 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 Fontana

In Fontana in October, the precipitation amount is 119 mm (4.7 in) spread over 13 days.

October Precipitation Trends in Fontana

The chart displays monthly precipitation patterns in Fontana, 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 Fontana, October typically receives around 119 mm (4.7 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec61586611015411584911041194952
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Fontana

In Fontana in October, humidity is 83%. With an average temperature of 11°C (53°F), this humidity feels like a heavy blanket wrapping around you, making every step feel sluggish and causing an inevitable sheen of sweat to form, which can dampen the joy of exploring your surroundings.

October Average Humidity in Fontana

This chart illustrates the average monthly humidity levels in Fontana, 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 Fontana is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Fontana

In Fontana in October, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Fontana.

Maximum UV Index Levels in Fontana for October

The chart shows the monthly maximum UV Index (UVI) for Fontana 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 Fontana typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098532
Data source: Fontana 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 Fontana Compares to Other Months

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

This table compares monthly weather conditions in Fontana, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)61 mm (2.4 inches)85%moderate
February Weather-4°C (25°F)58 mm (2.3 inches)85%moderate
March Weather3°C (37°F)66 mm (2.6 inches)85%high
April Weather8°C (47°F)110 mm (4.3 inches)85%very high
May Weather15°C (60°F)154 mm (6.0 inches)78%very high
June Weather21°C (71°F)115 mm (4.5 inches)80%very high
July Weather24°C (75°F)84 mm (3.3 inches)78%very high
August Weather22°C (72°F)91 mm (3.6 inches)76%very high
September Weather19°C (66°F)104 mm (4.1 inches)79%very high
October Weather11°C (53°F)119 mm (4.7 inches)83%moderate
November Weather3°C (37°F)49 mm (1.9 inches)88%moderate
December Weather-1°C (31°F)52 mm (2.1 inches)81%low

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