Penn Valley, California Weather
Coastal fog thickens at dawn. Day 77 of spring. Read this microseason across nine climate regions →
Penn Valley weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——88°64°—
- ThursdayJun 4Clear——89°61°+1°
- FridayJun 5Overcast——92°68°+3°
- SaturdayJun 6Overcast——80°58°-12°
- SundayJun 7Overcast——79°50°-1°
- MondayJun 8Light Drizzle15%0.05″70°56°-9°
- TuesdayJun 9Overcast15%—76°52°+6°
Ozone at AQI 68 now. AQI up 23 in the last 6 hours — air quality is degrading. With UV 0.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 16 by mid-afternoon.
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 68 now. With UV 0.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 16 by mid-afternoon.
- Present
- AQI 68
- UV peak
- 0.2 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 16
PM × Wind × Precip
PM2.5 at 12.8 µg/m³ (AQI 58) with a 0.65 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.65
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 6:34 AM
- Moonset
- 4:14 PM
- In sign
- ♑︎ Capricorn
Coastal fog thickens at dawn
Penn Valley at a glance
- Today vs. normal: 9°F above the seasonal normal for this latitude
- Last frost: April 11 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, 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.