Onyx, California Weather
Coastal fog thickens at dawn. Day 77 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 5Partly Cloudy——94°66°-1°
- SaturdayJun 6Overcast——84°64°-10°
- SundayJun 7Clear——83°59°-1°
- MondayJun 8Overcast——78°57°-5°
- TuesdayJun 9Overcast——69°50°-9°
- WednesdayJun 10Partly Cloudy——72°46°+3°
Ozone at AQI 103 now. AQI up 21 in the last 6 hours — air quality is degrading. With UV 11 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 154 by mid-afternoon.
CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 103 now. With UV 11 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 154 by mid-afternoon.
- Present
- AQI 103
- UV peak
- 11.2 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 154
PM × Wind × Precip
PM2.5/PM10 ratio 0.44 with 14 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.44
- Wind
- breezy
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 6:11 AM
- Moonset
- 4:12 PM
- In sign
- ♒︎ Aquarius
Coastal fog thickens at dawn
Onyx at a glance
- Today vs. normal: 15°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 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.