Grass Valley (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Grass Valley.
Climate overview of Grass Valley
Grass Valley, California, United States of America, sees big temperature differences between seasons, with July peaking at 31°C (88°F) and December dropping to 10°C (50°F).
The city receives considerable rain/snowfall, with around 1267 mm (50 in) annually. December is the wettest month. It has a distinct dry season from June to September, with very warm summers and cold winters.
Grass Valley Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Grass Valley - and find the best time to visit.
Monthly Temperature in Grass Valley
Visitors to Grass Valley can expect significant temperature changes throughout the year. Typically, average maximum daytime temperatures range from a very warm 31°C (88°F) in July to a chilly 10°C (50°F) in the coolest month, December.
Nights vary from 16°C (61°F) in July to around 1°C (34°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Grass Valley
Grass Valley is known for its substantial rain/snowfall, with annual precipitation reaching 1267 mm (50 in). The climate in Grass Valley shows significant variation throughout the year. Expect heavy rainfall in December, the wettest month, with an average of 261 mm (10 in) of precipitation over 14 rainy days.
In contrast, the driest month July offers drier and sunnier days, with around 0.2 mm (0.01 in) of rainfall over 0 rainy days. For more details, please visit our Grass Valley Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Grass Valley
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, June, September and October
- Warmest weather: July and August
- Fewest rainy days: July, August and September
- Wettest months: January, February, March, April, November and December, when rainfall is highest.
- Seasonal pattern: A distinct dry season from June to September, with very warm summers and cold winters
Frequently asked questions about the climate in Grass Valley
What is the best time to visit Grass Valley?
May, June, September and October typically offer the most optimal weather in Grass Valley. In contrast, January, February, March and December tend to have less optimal conditions. Grass Valley has a distinct dry season from June to September, with very warm summers and cold winters.
What temperatures can I expect in Grass Valley?
Daytime highs range from 10°C (50°F) in December to 31°C (88°F) in July. Nighttime lows range from 1°C (34°F) to 16°C (61°F). Temperatures vary considerably through the year.
How much rain does Grass Valley get?
Annual rainfall is around 1267 mm (50 in). December is the wettest month with 261 mm (10 in), while July is the driest with 0.2 mm (0.01 in).
Grass Valley 3-Day Forecast
Grass Valley (CA) 3-Day Forecast
Grass Valley on the map
Grass Valley is highlighted - select any city to see its climate.
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