October Weather in Vacaville, United States

Last updated: June 24, 2025

In October, the average temperature in Vacaville, United States hovers around 18°C (65°F), providing a pleasant climate for outdoor activities. The temperature can fluctuate between a minimum of 4°C (39°F) and a maximum of 38°C (100°F), offering a diverse range of experiences. Visitors should be prepared for some moisture, as the region sees an average precipitation of 26 mm (1.0 in) over 1 day, coupled with an average humidity level of 65%.

October Temperature in Vacaville

In October in Vacaville, the average temperature is 18°C (65°F). Maximum temperatures can reach 38°C (100°F), while minimum temperatures can drop to as low as 4°C (39°F). Be prepared for significant temperature variations throughout the day if you're planning a visit!

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

The chart illustrates October temperature patterns in Vacaville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Vacaville, October typically has an average temperature of 18°C (65°F), with highs reaching up to 38°C (100°F) and lows dropping to around 4°C (39°F).

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

October Precipitation in Vacaville

In Vacaville in October, the precipitation amount is 26 mm (1.0 in) over the course of 1 day.

October Precipitation Trends in Vacaville

The chart displays monthly precipitation patterns in Vacaville, 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 Vacaville, October typically receives around 26 mm (1.0 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 Vacaville

In Vacaville in October, humidity is 65%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace that clings to your skin, making you feel slightly sticky as you explore. It's comfortable enough for sightseeing, but breathable enough to enjoy a leisurely stroll, though you might find yourself seeking shade during the warmest parts of the day.

October Average Humidity in Vacaville

This chart illustrates the average monthly humidity levels in Vacaville, 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 Vacaville is approximately 65%, 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 Vacaville

In Vacaville in October, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Vacaville, you can refer to this Hourly UV Index in Vacaville.

Maximum UV Index Levels in Vacaville for October

The chart shows the monthly maximum UV Index (UVI) for Vacaville 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 Vacaville typically reaches 6, which falls under the high exposure category.

Data source: Vacaville 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 Vacaville Compares to Other Months

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

This table compares monthly weather conditions in Vacaville, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	119 mm (4.7 inches)	84%	moderate
February Weather	12°C (53°F)	102 mm (4.0 inches)	84%	moderate
March Weather	13°C (56°F)	77 mm (3.0 inches)	83%	high
April Weather	16°C (61°F)	32 mm (1.3 inches)	81%	very high
May Weather	19°C (66°F)	17 mm (0.7 inches)	74%	very high
June Weather	22°C (71°F)	1 mm (0.1 inches)	64%	extreme
July Weather	22°C (71°F)	0 mm (0.0 inches)	44%	extreme
August Weather	22°C (72°F)	0 mm (0.0 inches)	36%	very high
September Weather	21°C (71°F)	1 mm (0.0 inches)	44%	very high
October Weather	18°C (65°F)	26 mm (1.0 inches)	65%	high
November Weather	13°C (56°F)	38 mm (1.5 inches)	84%	moderate
December Weather	10°C (50°F)	85 mm (3.3 inches)	83%	moderate