October Weather in Diamond Bar, United States

Last updated: June 24, 2025

The average temperature in Diamond Bar, United States during October is a pleasant 20°C (68°F). Temperatures can fluctuate, with minimums dipping to 8°C (47°F) and soaring to a maximum of 38°C (101°F). Expect 12 mm (0.5 in) of precipitation over approximately 1 day, accompanied by an average humidity of 67%.

October Temperature in Diamond Bar

In October in Diamond Bar, the average temperature is 20°C (68°F). The maximum can reach 38°C (101°F), while the minimum can be as low as 8°C (47°F). Be prepared for warm days and cooler nights when planning your travel to Diamond Bar during this time.

October Weather in Diamond Bar: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Diamond Bar, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Diamond Bar, October typically has an average temperature of 20°C (68°F), with highs reaching up to 38°C (101°F) and lows dropping to around 8°C (47°F).

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

October Precipitation in Diamond Bar

In Diamond Bar in October, the precipitation amount is 12 mm (0.5 in) over the course of 1 day.

October Precipitation Trends in Diamond Bar

The chart displays monthly precipitation patterns in Diamond Bar, 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 Diamond Bar, October typically receives around 12 mm (0.5 inches) of precipitation spread over approximately 1 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 Diamond Bar

In Diamond Bar in October humidity is 67%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making travel comfortable yet slightly sticky, as the air clings to your skin and invites you to enjoy the sights at a leisurely pace.

October Average Humidity in Diamond Bar

This chart illustrates the average monthly humidity levels in Diamond Bar, 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 Diamond Bar 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 Diamond Bar

In Diamond Bar 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 Diamond Bar.

Maximum UV Index Levels in Diamond Bar for October

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

Data source: Diamond Bar 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 Diamond Bar Compares to Other Months

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

This table compares monthly weather conditions in Diamond Bar, 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)	80 mm (3.1 inches)	74%	moderate
February Weather	12°C (55°F)	70 mm (2.8 inches)	79%	high
March Weather	14°C (57°F)	76 mm (3.0 inches)	75%	very high
April Weather	16°C (62°F)	27 mm (1.1 inches)	70%	very high
May Weather	18°C (64°F)	17 mm (0.7 inches)	70%	very high
June Weather	21°C (70°F)	1 mm (0.0 inches)	72%	extreme
July Weather	24°C (76°F)	1 mm (0.1 inches)	73%	extreme
August Weather	25°C (77°F)	2 mm (0.1 inches)	69%	very high
September Weather	23°C (74°F)	3 mm (0.1 inches)	68%	very high
October Weather	20°C (68°F)	12 mm (0.5 inches)	67%	high
November Weather	16°C (61°F)	26 mm (1.0 inches)	68%	moderate
December Weather	12°C (54°F)	79 mm (3.1 inches)	71%	moderate