August Weather in Grass Valley, United States

Last updated: June 24, 2025

In August, the average temperature in Grass Valley, United States hovers around 25°C (77°F). Expect a minimum plunge to 11°C (52°F) and a scorching maximum of 39°C (103°F). With a mere 2 mm (0.1 in) of precipitation over 0 days, this month features a delightful average humidity of 36%, making it an ideal time to enjoy the outdoors!

August Temperature in Grass Valley

In August in Grass Valley, the average temperature is 25°C (77°F). Maximums can reach 39°C (103°F) and minimums can be as low as 11°C (52°F). This makes it an ideal time for travelers to enjoy a variety of outdoor activities while being prepared for fluctuating temperatures.

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

The chart illustrates August 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, August typically has an average temperature of 25°C (77°F), with highs reaching up to 39°C (103°F) and lows dropping to around 11°C (52°F).

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

August Precipitation in Grass Valley

In Grass Valley in August, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

August Precipitation Trends in Grass Valley

The chart displays monthly precipitation patterns in Grass Valley, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Grass Valley, August typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 days.

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

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Millimeters (mm) Inches (in)

August Humidity in Grass Valley

In Grass Valley in August humidity is 36%. With an average temperature of 25°C (77°F), this humidity feels like a refreshing breath of fresh air that's comfortable for traveling and exploring the area without feeling too clammy or weighed down.

August Average Humidity in Grass Valley

This chart illustrates the average monthly humidity levels in Grass Valley, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Grass Valley is approximately 36%, offering insight into how humid the weather typically is during this month.

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

August UV Index in Grass Valley

In Grass Valley in August, 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 August

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

Data source: Grass Valley August 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 August 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 August’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 August’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