Penn Valley, California Weather
Coastal fog thickens at dawn. Day 76 of spring. Read this microseason across nine climate regions →
Penn Valley weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——88°66°—
- ThursdayJun 4Clear——90°66°+2°
- FridayJun 5Mostly Clear——91°63°+1°
- SaturdayJun 6Overcast——82°56°-9°
- SundayJun 7Overcast——78°52°-4°
- MondayJun 8Light Rain18%0.29″55°46°-23°
- TuesdayJun 9Overcast14%—72°53°+17°
PM2.5 at 13.2 µg/m³ (AQI 59) with a 0.76 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in calm air, not road dust. AQI down 9 over the last 6 hours (steady decline since this morning).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 13.2 µg/m³ (AQI 59) with a 0.76 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.76
- Wind
- calm
- 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).
The higher the clouds, the finer the weather.
- Moonrise
- 5:56 AM
- Moonset
- 3:11 PM
- In sign
- ♑︎ Capricorn
Coastal fog thickens at dawn
Penn Valley at a glance
- Today vs. normal: 9°F below 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 3, 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.