October Weather in Tustin, United States

Last updated: June 24, 2025

In Tustin, United States, the average temperature in October is a pleasant 20°C (69°F). Expect temperatures to range from a cool 10°C (50°F) to a warm 38°C (101°F). Additionally, anticipate a modest precipitation amount of 10 mm (0.4 in) over just 1 day. With an average humidity of 67%, the climate strikes a comfortable balance ideal for exploration or relaxation.

October Temperature in Tustin

In October in Tustin, the average temperature is 20°C (69°F). The maximum can reach 38°C (101°F), while the minimum can dip as low as 10°C (50°F). Overall, it's a great time to visit Tustin if you enjoy mild to warm weather with occasional heat.

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

The chart illustrates October temperature patterns in Tustin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tustin, October typically has an average temperature of 20°C (69°F), with highs reaching up to 38°C (101°F) and lows dropping to around 10°C (50°F).

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

October Precipitation in Tustin

In Tustin in October, the precipitation amount is 10 mm (0.4 in) over the course of 1 day.

October Precipitation Trends in Tustin

The chart displays monthly precipitation patterns in Tustin, 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 Tustin, October typically receives around 10 mm (0.4 inches) of precipitation spread over approximately 1 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

October Humidity in Tustin

In Tustin 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 Tustin

This chart illustrates the average monthly humidity levels in Tustin, 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 Tustin 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 Tustin

In Tustin 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 Tustin.

Maximum UV Index Levels in Tustin for October

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

Data source: Tustin 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 Tustin Compares to Other Months

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

This table compares monthly weather conditions in Tustin, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (56°F)	71 mm (2.8 inches)	74%	moderate
February Weather	13°C (56°F)	60 mm (2.3 inches)	79%	high
March Weather	14°C (58°F)	68 mm (2.7 inches)	75%	very high
April Weather	17°C (62°F)	27 mm (1.1 inches)	70%	very high
May Weather	17°C (64°F)	13 mm (0.5 inches)	70%	extreme
June Weather	20°C (68°F)	1 mm (0.0 inches)	72%	extreme
July Weather	23°C (73°F)	2 mm (0.1 inches)	73%	extreme
August Weather	23°C (74°F)	2 mm (0.1 inches)	69%	very high
September Weather	22°C (72°F)	3 mm (0.1 inches)	68%	very high
October Weather	20°C (69°F)	10 mm (0.4 inches)	67%	high
November Weather	17°C (62°F)	25 mm (1.0 inches)	68%	moderate
December Weather	13°C (56°F)	74 mm (2.9 inches)	71%	moderate