October Weather in Rancho Cucamonga, United States

Last updated: June 24, 2025

The average temperature in Rancho Cucamonga, United States during October is a pleasant 20°C (69°F). Be prepared for a range, as temperatures can dip to a cool 6°C (44°F) or soar to a sizzling 39°C (103°F). Expect 15 mm (0.6 in) of precipitation over just 2 days, contributing to an overall average humidity of 67%.

October Temperature in Rancho Cucamonga

In October in Rancho Cucamonga, the average temperature is 20°C (69°F). Maximums can reach 39°C (103°F) and minimums can be as low as 6°C (44°F). It's advisable to pack a variety of clothing to accommodate the fluctuating temperatures during your travels.

October Weather in Rancho Cucamonga: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Rancho Cucamonga, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rancho Cucamonga, October typically has an average temperature of 20°C (69°F), with highs reaching up to 39°C (103°F) and lows dropping to around 6°C (44°F).

Data source: Temperature data for Rancho Cucamonga generated using information from the Copernicus Climate Change Service.

October Precipitation in Rancho Cucamonga

In Rancho Cucamonga in October, the precipitation amount is 15 mm (0.6 in) over the course of 2 days.

October Precipitation Trends in Rancho Cucamonga

The chart displays monthly precipitation patterns in Rancho Cucamonga, 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 Rancho Cucamonga, October typically receives around 15 mm (0.6 inches) of precipitation spread over approximately 2 days.

Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

October Humidity in Rancho Cucamonga

In Rancho Cucamonga in October, humidity is 67%. With an average temperature of 20°C (69°F), this humidity feels like a warm, gentle embrace that clings to your skin, creating a comfortable yet slightly sticky atmosphere that can be refreshing while exploring the sights, provided you stay hydrated and take breaks in the shade.

October Average Humidity in Rancho Cucamonga

This chart illustrates the average monthly humidity levels in Rancho Cucamonga, 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 Rancho Cucamonga is approximately 67%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Rancho Cucamonga

In Rancho Cucamonga 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 Rancho Cucamonga.

Maximum UV Index Levels in Rancho Cucamonga for October

The chart shows the monthly maximum UV Index (UVI) for Rancho Cucamonga 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 Rancho Cucamonga typically reaches 7, which falls under the high exposure category.

Data source: Rancho Cucamonga 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 Rancho Cucamonga Compares to Other Months

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

This table compares monthly weather conditions in Rancho Cucamonga, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (54°F)	87 mm (3.4 inches)	74%	moderate
February Weather	12°C (54°F)	84 mm (3.3 inches)	79%	high
March Weather	14°C (57°F)	95 mm (3.7 inches)	75%	very high
April Weather	17°C (63°F)	35 mm (1.4 inches)	70%	very high
May Weather	18°C (66°F)	23 mm (0.9 inches)	70%	very high
June Weather	23°C (73°F)	3 mm (0.1 inches)	72%	extreme
July Weather	26°C (80°F)	1 mm (0.1 inches)	73%	extreme
August Weather	26°C (80°F)	2 mm (0.1 inches)	69%	very high
September Weather	24°C (76°F)	5 mm (0.2 inches)	68%	very high
October Weather	20°C (69°F)	15 mm (0.6 inches)	67%	high
November Weather	16°C (61°F)	35 mm (1.4 inches)	68%	moderate
December Weather	12°C (54°F)	87 mm (3.4 inches)	71%	moderate