Grass Valley, CA 95945 Weather

Nevada County10:48 AM PDT39.21°N, 121.01°W

Current conditions

Light Rain Likely
54°
Light Rain Likely
Feels like 54°
High 56°·Low 47°
WindSSE 2 mph
Humidity100%
Dew point54°
Visibility10 mi
Cloud cover89%
UV index1 Low
Sunrise7:22 AM
Sunset6:17 PM

Forecast for this hour (no station report in the last two hours)

Forecast

10-day

  • Today

    Rain likely before 11am, then showers and thunderstorms between 11am and 5pm, then rain likely. Mostly cloudy. High near 56, with temperatures falling to around 54 in the afternoon. South wind around 2 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

  • Tonight

    Rain. Cloudy. Low around 47, with temperatures rising to around 50 overnight. South southeast wind 0 to 3 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

  • Friday

    A chance of rain before 10am. Partly sunny, with a high near 63. Northwest wind 0 to 3 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.

National Weather Service forecast updated 8 hrs ago.

Hourly

Hourly forecast
  1. Now Light Rain Likely 54°58%
  2. 11 AM Showers And Thunderstorms Likely 53°62%
  3. 12 PM Showers And Thunderstorms Likely 54°66%
  4. 1 PM Showers And Thunderstorms Likely 54°56%
  5. 2 PM Showers And Thunderstorms 54°76%
  6. 3 PM Showers And Thunderstorms 55°85%
  7. 4 PM Showers And Thunderstorms 54°90%
  8. 5 PM Rain Likely 54°62%
  9. 6 PM Rain Likely 54°71%
  10. 7 PM Rain 52°75%
  11. 8 PM Rain 52°81%
  12. 9 PM Rain 52°89%
  13. 10 PM Rain 52°91%
  14. 11 PM Light Rain 52°85%
  15. Fri12 AM Light Rain 52°89%
  16. 1 AM Light Rain 51°75%
  17. 2 AM Light Rain Likely 51°61%
  18. 3 AM Chance Light Rain 51°52%
  19. 4 AM Chance Light Rain 51°53%
  20. 5 AM Chance Light Rain 50°53%
  21. 6 AM Chance Light Rain 50°49%
  22. 7 AM Chance Light Rain 50°51%
  23. 8 AM Chance Light Rain 48°37%
  24. 9 AM Chance Light Rain 51°25%

Daily forecast

Details
  1. TodayOct 22 Showers And Thunderstorms Showers And Thunderstorms91%47°56°
  2. FriOct 23 Chance Light Rain then Partly Sunny Chance Light Rain then Partly Sunny51%45°63°
  3. SatOct 24 Sunny Sunny45°68°
  4. SunOct 25 Sunny Sunny47°68°
  5. MonOct 26 Sunny Sunny46°67°
  6. TueOct 27 Sunny Sunny46°67°
  7. WedOct 28 Mostly Sunny Mostly Sunny47°68°
  8. ThuOct 29 Cloudy Cloudy41°71°
  9. FriOct 30 Cloudy Cloudy42°71°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

Full map
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Weather news in California

More weather news

Air quality

28
Good
Ozone

Air quality is satisfactory, and air pollution poses little or no risk.

Western Nevada County, CA reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.

Sun & moon

Sunrise 7:22 AM
Sunset 6:17 PM
Daylight 10 h 55 min (−2 min 25 s tomorrow)
Waxing Gibbous · 86% lit
Moonrise 4:20 PM Moonset 3:34 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low68° / 46°
Record high94° (1903)
Record low25° (1961)
Wettest4.23 in (1899)
Yesterday70° / 47°, <0.01 in
Month to date<0.01 in (normal 1.58 in)

Nevada City, records since 1893. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in STO, issued 21 hrs ago

Key Messages

- Scattered showers, thunderstorms, and high elevation snow showers expected through late Thursday.

- Drier weather moves in Friday and into the weekend, with breezy north to east winds Friday.

- Ridge builds in over the weekend, with slight chances for showers in Shasta county.

.DISCUSSION...

...Today through Thursday...

Current radar has a swath of rain and isolated thunderstorms through the Coastal Range down toward the Sierra Foothills. The track is to the north-northwest. We have seen a few lightning strikes over the past couple of hours, but they remain few and far between storms. There are gaps of coverage in the rain as it moves through the area, but HIRES guidance continues to show the swath of rain filling in completely over the next several hours and begin to push toward the north and east as the main upper level system off the coast moves onshore. Instability has been lacking in the latest observations, with only up to 250 J/kg across the Valley, foothills, and mountains. This will likely continue for the rest of the afternoon. Cloud coverage is the key into keeping the instability lower than expected. None the less, moisture content is high and lift is present to development thunderstorms and at least maintain them through this evening. The question remains on if these storms will be able to sustain hail shafts long enough to produce nickel or even quarter size hail. As of right now, we are leaning toward small hail as a possibility and brief gusty winds in the strongest of storms. Brief heavy rain and frequent lightning will also be a hazard to watch out for.

Aviation

Showers and isolated thunderstorms will be possible through the afternoon and into the evening hours, with lowered ceilings. Ceilings should remain VFR, but chances are there for MVFR for all sites post 00z. Best timeframe for thunderstorms will be 2000z through 0400z for all sites. Winds will remain light throughout the day. Areas in and around thunderstorms may see erratic winds, brief moderate rain reducing visibilities and IFR ceilings. Otherwise, we are looking at a lull in activity later tonight around 09-10z through the mid morning hours. During this lull isolated to scattered showers at times for the sites. Near the end of the TAF period thunderstorm chances start to increase once again.

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.