Onyx, California Weather
Coastal fog thickens at dawn. Day 78 of spring. Read this microseason across nine climate regions →
Onyx weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Clear——95°65°—
- FridayJun 5Clear——94°66°-1°
- SaturdayJun 6Overcast——85°64°-9°
- SundayJun 7Overcast——83°59°-2°
- MondayJun 8Overcast——77°57°-6°
- TuesdayJun 9Overcast——67°53°-10°
- WednesdayJun 10Mostly Clear——77°49°+10°
Ozone at AQI 500 — peak already passed at 1 PM under clear skies. AQI up 52 in the last 6 hours — air quality is degrading. Levels should ease through evening.
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 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 500
- UV peak
- 2.3 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 500
PM × Wind × Precip
PM2.5/PM10 ratio 0.52 with 22 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.52
- Wind
- windy
- Recent rain
- 0h in last 6h
- Pattern
- transport
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
- 6:45 AM
- Moonset
- 5:14 PM
- In sign
- ♒︎ Aquarius
Coastal fog thickens at dawn
Onyx at a glance
- Today vs. normal: 11°F above the seasonal normal for this latitude
- Last frost: March 21 (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 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.