Princeton, California Weather
Coastal fog thickens at dawn. Day 77 of spring. Read this microseason across nine climate regions →
Princeton weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 2Overcast——90°56°—
- WednesdayJun 3Overcast——91°63°+1°
- ThursdayJun 4Clear——100°58°+9°
- FridayJun 5Overcast——102°63°+2°
- SaturdayJun 6Overcast——93°60°-9°
- SundayJun 7Overcast——88°53°-5°
- MondayJun 8Overcast——70°56°-18°
Ozone at AQI 500. AQI up 16 in the last 6 hours — air quality is degrading. Overcast through the UV peak window (cloud cover ~63%) — afternoon ozone should stay flat.
AVOID OUTDOORS Avoid outdoor exertion. Keep windows closed; use HEPA filtration indoors if available.
What's driving it
Ozone × UV × Sky
Ozone at AQI 500. Overcast through the UV peak window (cloud cover ~63%) — afternoon ozone should stay flat.
- Present
- AQI 500
- UV peak
- 7.5 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 250
PM × Wind × Precip
PM2.5 at 8.1 µg/m³ (AQI 45) with a 0.66 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.66
- 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).
If bees stay at home, rain will soon come; if they fly away, fine will be the day.
- Moonrise
- 5:17 AM
- Moonset
- 2:14 PM
- In sign
- ♑︎ Capricorn
Coastal fog thickens at dawn
Princeton at a glance
- Today vs. normal: 12°F above the seasonal normal for this latitude
- Last frost: April 12 (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.