The best times to visit Grass Valley for ideal weather are

May 28th to October 14th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.

 

 


Other Grass Valley Travel Info

Weather in Grass Valley

Temperature

Average temperatures in Grass Valley vary greatly. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a fair chance of precipitation about half of the year. The area is less temperate than some — in the 39th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Grass Valley, the hottest months are July, August, and then September. See average monthly temperatures below. The warmest time of year is generally early July where highs are regularly around 79.8°F (26.6°C) with temperatures rarely dropping below 64.5°F (18.1°C) at night.

Grass Valley Temperatures (Fahrenheit)

Key
High
Average
Low

Grass Valley Temperatures (Celsius)

Key
High
Average
Low

“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Grass Valley Perceived Temperature (F)

Key
High
Average
Low

Grass Valley Perceived Temperature (C)

Key
High
Average
Low

 

Average Grass Valley Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 50.6 42.9 37.2
Feb 47 39.8 34.6
Mar 50.4 42.4 36.7
Apr 54.8 45.5 39
May 62.3 53.3 46.4
Jun 71.3 62.6 55.4
Jul 78.7 70.5 63.7
Aug 78.3 69.5 62.8
Sep 74.9 65.5 58.8
Oct 63.5 54.9 48.7
Nov 53.5 46 40.4
Dec 44.7 38.1 32.8

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 10.3 6.1 2.9
Feb 8.3 4.3 1.4
Mar 10.2 5.8 2.6
Apr 12.7 7.5 3.9
May 16.8 11.8 8
Jun 21.8 17 13
Jul 25.9 21.4 17.6
Aug 25.7 20.8 17.1
Sep 23.8 18.6 14.9
Oct 17.5 12.7 9.3
Nov 11.9 7.8 4.7
Dec 7.1 3.4 0.4

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Grass Valley are July, August, and then September. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early July. For example, on the week of July 2nd there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in mid December with an average of 3 days of significant precipitation the week of December 17th.

When can you find snow in Grass Valley? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Grass Valley.

Key
Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Grass Valley (in).

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 22% 0 4.5
Feb 32% 0 6.7
Mar 30% 0 8
Apr 23% 0 4.1
May 16% 0 3.1
Jun 7% 0 1.4
Jul 1% 0 0.1
Aug 1% 0 0.1
Sep 3% 0 1.6
Oct 16% 0 4.2
Nov 23% 0 5.7
Dec 37% 0 10.5

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 22 0 11.4
Feb 32 0 17
Mar 30 0 20.3
Apr 23 0 10.4
May 16 0 7.9
Jun 7 0 3.6
Jul 1 0 0.3
Aug 1 0 0.3
Sep 3 0 4.1
Oct 16 0 10.7
Nov 23 0 14.5
Dec 37 0 26.7

 

Humidity and Wind

Grass Valley has some comfortably humid months, and dry months in the opposite season. The least humid month is August (21.8% relative humidity), and the most humid month is March (49.6%).

Wind in Grass Valley is usually calm. The windiest month is March, followed by February and December. March’s average wind speed of around 5.9 knots (6.7 MPH or 10.8 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in mid December where average top sustained speeds reach 13.5 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Grass Valley.

Key
Avg. Relative Humidity

Wind

The graph below shows wind speed (max and average) in knots.

Key
Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 5 Light breeze 10.5 Gentle breeze
Feb 5.7 Light breeze 12 Significant breeze
Mar 5.9 Light breeze 12 Gentle breeze
Apr 5.3 Light breeze 11.3 Significant breeze
May 5 Light breeze 10.8 Gentle breeze
Jun 4.7 Light breeze 10 Gentle breeze
Jul 3.9 Barely noticeable 9.2 Gentle breeze
Aug 4.1 Light breeze 9.9 Gentle breeze
Sep 4.4 Light breeze 10 Gentle breeze
Oct 4.7 Light breeze 9.8 Gentle breeze
Nov 5 Light breeze 10.4 Gentle breeze
Dec 5.7 Light breeze 11.9 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 36.1%
Feb 48.9%
Mar 49.6%
Apr 44.9%
May 39.1%
Jun 31.8%
Jul 25.9%
Aug 21.8%
Sep 25%
Oct 36.7%
Nov 41.5%
Dec 49.4%

 

Is it Safe to Travel to Grass Valley?

Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 23, 2019.


 

The Busiest and Least Crowded Months

The busiest month for tourism in Grass Valley, CA, US is June, followed by July and August. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Grass Valley in December. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month

 

Most Popular Months to Visit

Key
Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 48.1 in December means 48.1% of the tourists vs. June.

 

 

Overall Grass Valley Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 65.6°F (18.7°C) and 45.1°F (7.3°C) with warmer temperatures in the later months. Rain is somewhat common with 5 to 9 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are comfortable. These months see the least precipitation with 0 to 2 days of precipitation per month. June – August is the busiest season for tourism in Grass Valley, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 77.3°F (25.2°C) and 50°F (10°C), which will feel comfortable given the humidity and wind. It rains or snows a significant amount: 1 to 7 days per month. Tourism is fairly slow during these months due to the weather, so hotels may be lower priced.

Winter (December through February)

Weather is too cold this time of year in Grass Valley to be enjoyable for warm weather travelers. The average high during this season is between 52.4°F (11.3°C) and 42.4°F (5.8°C). On average, it rains or snows a fair amount: 7 to 11 times per month. These times of year are the slowest with tourists.

 

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