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Grass Valley, CA Weather
Current conditions
Observed at Nevada County Air Park · 27 min ago
Forecast
10-day-
Thursday Night
Rain. Cloudy. Low around 46, with temperatures rising to around 51 overnight. Southeast wind around 2 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
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Friday
A chance of rain before 11am. Mostly sunny, with a high near 64. Northwest wind 0 to 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
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Friday Night
Clear, with a low around 44. Northeast wind 5 to 8 mph.
National Weather Service forecast updated 1 day ago.
Hourly
Hourly forecast- Now54°54%
- 11 PM54°67%
- Fri12 AM54°64%
- 1 AM53°61%
- 2 AM53°48%
- 3 AM52°33%
- 4 AM51°34%
- 5 AM51°34%
- 6 AM48°34%
- 7 AM49°34%
- 8 AM52°34%
- 9 AM53°34%
- 10 AM55°34%
- 11 AM57°
- 12 PM59°
- 1 PM61°
- 2 PM62°
- 3 PM63°
- 4 PM64°
- 5 PM62°
- 6 PM59°
- 7 PM55°
- 8 PM51°
- 9 PM49°
10-day forecast
Details- TonightOct 21Showers And Thunderstorms Likely then Light Rain Likely68%48°
- TodayOct 22Showers And Thunderstorms86%46°59°
- FriOct 23Chance Light Rain then Mostly Sunny34%44°64°
- SatOct 24Sunny43°68°
- SunOct 25Sunny44°68°
- MonOct 26Sunny43°67°
- TueOct 27Sunny43°67°
- WedOct 28Mostly Sunny11%66°
- ThuOct 29Cloudy46°71°
- FriOct 30Cloudy47°64°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news in California
More weather news-
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Air quality
Air quality is satisfactory, and air pollution poses little or no risk.
Western Nevada County, CA reporting area · 2 hrs ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Almanac
MonthlyNevada City, records since 1893. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Roseville 56 km
- Yuba City 49 km
- Rocklin 50 km
- Lincoln 42 km
- El Dorado Hills 59 km
- Granite Bay 51 km
- Linda 43 km
- Oroville 54 km
- South Yuba City 51 km
- Auburn 36 km
- Olivehurst 45 km
- North Auburn 32 km
Forecasters' discussion
From the National Weather Service office in STO, issued 9 hrs ago
Key Messages
- Scattered showers, thunderstorm chances, and high elevation snow showers through this evening. Lingering mountain showers Friday morning.
- Breezy north to east winds develop Friday afternoon into Saturday AM, followed by weaker downsloping winds Sat PM-Sun AM.
- Dry weather continues through most of next week, with potential for unsettled weather Halloween Weekend.
.DISCUSSION...
...Today through Friday AM... Cloudy skies and scattered showers are actively being observed across interior Northern California. Some isolated moderate to heavy rain will be possible at times, but precipitation will largely be light to moderate. Shower activity will gradually trend down through the afternoon hours, but a few scattered light showers may linger over the Sierra. Given the cloud cover and lack of instability as this weather system treks through Southern California, the threat for thunderstorms has largely trended down, but an isolated thunderstorm (10-15% chance) is still possible over the Sierra and Motherlode this afternoon/early evening. Forecast precipitation amounts for the remainder of the day are around 0.10 to 0.20 inches in the Valley, with higher amounts just over 0.50 inches along the Sierra.
Snow levels continue to be around 8000-9000 feet in the Sierra today, with additional snowfall amounts of 1-3 inches at the highest peaks. Best chance for snow will be toward Mono county and into the Yosemite area. Minor impacts are possible at the highest elevations in Tuolumne county and toward Alpine due to the snow.
Aviation
Showers and isolated thunderstorms continue through the afternoon and evening hours, with localized areas of MVFR to IFR ceilings. Best timeframe for thunderstorms will be 2000z through 0400z for all sites with a 10-15% chance of occurrence. Winds will remain light throughout the day outside of erratic winds near thunderstorms. After 06z Friday, showers linger over the Sierra into Friday 18z and fog and stratus in the Valley overnight after 09z Friday with lowered ceilings as low as IFR to LIFR ceilings. Snow levels 7500-8500 feet until lowering after 12z Friday to around 6000-8000 feet.
Sto Watches
None.
Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Search index and reflects what the press published. Terms of use.