Penn Valley, California Weather
Summer heat deepens across the valleys. Day 15 of summer. Read this microseason across nine climate regions →
Penn Valley weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast——88°69°—
- MondayJul 6Overcast——89°66°+1°
- TuesdayJul 7Overcast——91°60°+2°
- WednesdayJul 8Clear——95°60°+4°
- ThursdayJul 9Clear——98°63°+3°
- FridayJul 10Overcast——99°66°+1°
- SaturdayJul 11Overcast——102°68°+3°
AQI 29 (Good), driven by PM2.5. AQI down 6 over the last 6 hours (gradual decline). PM2.5 at 8.5 µg/m³, PM10 at 11.8 µg/m³ — typical background levels with no transport signature.
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. Overcast through the UV peak window (cloud cover ~91%) — afternoon ozone should stay flat.
- Present
- AQI 37
- UV peak
- 7.2 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 18
PM × Wind × Precip
PM2.5 at 8.5 µg/m³, PM10 at 11.8 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.72
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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
- 11:23 AM
- In sign
- ♓︎ Pisces
Summer heat deepens across the valleys
Penn Valley at a glance
- Today vs. normal: 8°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 code: 95946
16-Day Forecast — Penn Valley
- Sun88°69°1%
- Mon89°66°1%
- Tue91°60°0%
- Wed95°60°0%
- Thu98°63°0%
- Fri99°66°0%
- Sat102°68°0%
- Sun103°70°0%
- Mon109°77°3%
- Tue109°78°4%
- Wed99°74°2%
- Thu95°69°3%
- Fri105°71°10%
- Sat110°75°10%
- Sun110°78°11%
- Mon102°72°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 Penn Valley
- 95946