October Weather in Grass Valley, United States

Last updated: June 24, 2025

In Grass Valley, United States, the average temperature in October hovers around 15°C (60°F), with a minimum dipping to 1°C (34°F) and a maximum rising to 34°C (94°F). Expect about 78 mm (3.1 in) of precipitation over 3 days, and keep in mind the average humidity sits at a comfortable 65%. Enjoy the mild weather, but be prepared for occasional showers!

October Temperature in Grass Valley

In October in Grass Valley, the average temperature is 15°C (60°F). The maximum can reach 34°C (94°F), while the minimum can be as low as 1°C (34°F). It's advisable to pack layers to accommodate the varied temperatures during your travels.

October Weather in Grass Valley: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Grass Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grass Valley, October typically has an average temperature of 15°C (60°F), with highs reaching up to 34°C (94°F) and lows dropping to around 1°C (34°F).

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

October Precipitation in Grass Valley

In Grass Valley in October, the precipitation amount is 78 mm (3.1 in) during a span of 3 days.

October Precipitation Trends in Grass Valley

The chart displays monthly precipitation patterns in Grass Valley, 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 Grass Valley, October typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 3 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 Grass Valley

In Grass Valley in October, humidity is 65%. With an average temperature of 15°C (60°F), this humidity feels like a warm blanket wrapped around you, making it a bit muggy for traveling but still comfortable enough to enjoy outdoor activities.

October Average Humidity in Grass Valley

This chart illustrates the average monthly humidity levels in Grass Valley, 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 Grass Valley 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 Grass Valley

In Grass Valley 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 Grass Valley, you can refer to this Hourly UV Index in Grass Valley.

Maximum UV Index Levels in Grass Valley for October

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

Data source: Grass Valley 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 Grass Valley Compares to Other Months

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

This table compares monthly weather conditions in Grass Valley, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (45°F)	269 mm (10.6 inches)	84%	moderate
February Weather	8°C (46°F)	279 mm (11.0 inches)	84%	moderate
March Weather	9°C (48°F)	267 mm (10.5 inches)	83%	high
April Weather	13°C (55°F)	129 mm (5.1 inches)	81%	very high
May Weather	17°C (62°F)	76 mm (3.0 inches)	74%	very high
June Weather	22°C (72°F)	13 mm (0.5 inches)	64%	extreme
July Weather	26°C (79°F)	1 mm (0.0 inches)	44%	extreme
August Weather	25°C (77°F)	2 mm (0.1 inches)	36%	very high
September Weather	21°C (70°F)	23 mm (0.9 inches)	44%	very high
October Weather	15°C (60°F)	78 mm (3.1 inches)	65%	high
November Weather	10°C (51°F)	157 mm (6.2 inches)	84%	moderate
December Weather	7°C (44°F)	215 mm (8.4 inches)	83%	moderate