Johannesburg, California Weather
Coastal fog thickens at dawn. Day 77 of spring. Read this microseason across nine climate regions →
Johannesburg weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Mostly Clear——94°65°—
- ThursdayJun 4Clear——95°69°+1°
- FridayJun 5Mostly Clear——94°68°-1°
- SaturdayJun 6Overcast——88°63°-6°
- SundayJun 7Clear——87°57°-1°
- MondayJun 8Clear——87°55°0°
- TuesdayJun 9Mostly Clear——87°57°0°
Ozone at AQI 73 now. AQI up 34 in the last 6 hours — air quality is degrading. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 18 by mid-afternoon.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 6 AM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 73 now. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 18 by mid-afternoon.
- Present
- AQI 73
- UV peak
- 0.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 18
PM × Wind × Precip
PM10 at 58.4 µg/m³ (AQI 53) with a 0.21 fine-to-coarse ratio under 20 mph wind — coarse road or agricultural dust being kicked up.
- PM2.5/PM10
- 0.21
- Wind
- windy
- Recent rain
- 0h in last 6h
- Pattern
- blown dust
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
- 6:08 AM
- Moonset
- 4:10 PM
- In sign
- ♑︎ Capricorn
Coastal fog thickens at dawn
Johannesburg at a glance
- Today vs. normal: 4°F below the seasonal normal for this latitude
- Last frost: March 19 (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.