Grass Valley, California Weather
Summer heat deepens across the valleys. Day 15 of summer. Read this microseason across nine climate regions →
Grass Valley weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast——84°67°—
- MondayJul 6Overcast——86°65°+2°
- TuesdayJul 7Overcast——88°60°+2°
- WednesdayJul 8Clear——91°60°+3°
- ThursdayJul 9Clear——94°63°+3°
- FridayJul 10Overcast——97°66°+3°
- SaturdayJul 11Overcast——98°67°+1°
AQI 29 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 8.5 µg/m³ (AQI 47) with a 0.72 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 37 now. With UV 7.2 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 25 around 1 PM.
- Present
- AQI 37
- UV peak
- 7.2 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 25
PM × Wind × Precip
PM2.5 at 8.5 µg/m³ (AQI 47) with a 0.72 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.72
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:24 PM
- Moonset
- 11:22 AM
- In sign
- ♓︎ Pisces
Summer heat deepens across the valleys
Grass Valley at a glance
- Today vs. normal: 10°F above the seasonal normal for this latitude
- Last frost: April 11 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP codes: 95945, 95949
16-Day Forecast — Grass Valley
- Sun84°67°1%
- Mon86°65°1%
- Tue88°60°0%
- Wed91°60°0%
- Thu94°63°0%
- Fri97°66°0%
- Sat98°67°0%
- Sun88°67°1%
- Mon94°63°3%
- Tue101°67°4%
- Wed100°69°2%
- Thu101°70°3%
- Fri102°74°10%
- Sat101°73°10%
- Sun97°70°11%
- Mon97°65°6%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
ZIP codes in Grass Valley
- 95945
- 95949