May Weather in Grass Valley, United States

Last updated: June 24, 2025

In Grass Valley, United States, the average temperature in May is a comfortable 17°C (62°F), with temperatures ranging from a brisk 1°C (34°F) to a toasty 34°C (93°F). Expect 76 mm (3.0 in) of precipitation over approximately 7 days, contributing to an average humidity of 74%. Whether you’re exploring or relaxing, pack accordingly!

May Temperature in Grass Valley

In May in Grass Valley, the average temperature is 17°C (62°F). Maximum temperatures can reach 34°C (93°F), while the minimum can drop as low as 1°C (34°F). Be prepared for a wide range of temperatures during your travels!

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

The chart illustrates May 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, May typically has an average temperature of 17°C (62°F), with highs reaching up to 34°C (93°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.

May Precipitation in Grass Valley

In Grass Valley in May, the precipitation amount is 76 mm (3.0 in) over a period of 7 days.

May Precipitation Trends in Grass Valley

The chart displays monthly precipitation patterns in Grass Valley, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Grass Valley, May typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 7 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

May Humidity in Grass Valley

In Grass Valley in May, humidity is 74%. With an average temperature of 17°C (62°F), this humidity feels like a warm blanket enveloping you, making travel slightly uncomfortable as it can cause perspiration and a heavy feeling in the air, especially during outdoor activities.

May Average Humidity in Grass Valley

This chart illustrates the average monthly humidity levels in Grass Valley, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Grass Valley is approximately 74%, offering insight into how humid the weather typically is during this month.

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

May UV Index in Grass Valley

In Grass Valley in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Grass Valley.

Maximum UV Index Levels in Grass Valley for May

The chart shows the monthly maximum UV Index (UVI) for Grass Valley in May, 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 May, the maximum UV index in Grass Valley typically reaches 10, which falls under the very high exposure category.

Data source: Grass Valley May 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 May 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 May’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 May’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