Johannesburg, California Weather
Summer heat deepens across the valleys. Day 15 of summer. Read this microseason across nine climate regions →
Johannesburg weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast——93°73°—
- MondayJul 6Clear——95°71°+2°
- TuesdayJul 7Clear——98°65°+3°
- WednesdayJul 8Clear——100°63°+2°
- ThursdayJul 9Clear——103°64°+3°
- FridayJul 10Clear——101°64°-2°
- SaturdayJul 11Overcast——100°64°-1°
AQI 40 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM10 at 44.6 µg/m³ (AQI 41) with a 0.29 fine-to-coarse ratio under 11 mph wind — coarse road or agricultural dust being kicked up.
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 34 now. With UV 10 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 47 around 1 PM.
- Present
- AQI 34
- UV peak
- 10.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 47
PM × Wind × Precip
PM10 at 44.6 µg/m³ (AQI 41) with a 0.29 fine-to-coarse ratio under 11 mph wind — coarse road or agricultural dust being kicked up.
- PM2.5/PM10
- 0.29
- Wind
- breezy
- 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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:07 PM
- Moonset
- 11:09 AM
- In sign
- ♓︎ Pisces
Summer heat deepens across the valleys
Johannesburg at a glance
- Today vs. normal: 6°F above the seasonal normal for this latitude
- Last frost: March 19 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 93528
16-Day Forecast — Johannesburg
- Sun93°73°1%
- Mon95°71°0%
- Tue98°65°0%
- Wed100°63°0%
- Thu103°64°0%
- Fri101°64°0%
- Sat100°64°1%
- Sun102°68°2%
- Mon104°72°8%
- Tue100°73°10%
- Wed95°77°7%
- Thu94°78°13%
- Fri101°76°11%
- Sat108°82°6%
- Sun105°80°6%
- Mon105°76°10%
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 Johannesburg
- 93528