Johannesburg, California Weather
Summer solstice light stretched thin. Day 88 of spring. Read this microseason across nine climate regions →
Johannesburg weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Clear——98°72°—
- TuesdayJun 16Clear——98°74°0°
- WednesdayJun 17Clear——97°66°-1°
- ThursdayJun 18Clear——95°63°-2°
- FridayJun 19Clear——90°59°-5°
- SaturdayJun 20Clear——89°55°-1°
- SundayJun 21Clear——91°54°+2°
AQI 53 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM10 at 47.3 µg/m³ (AQI 44) with a 0.29 fine-to-coarse ratio under 16 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 30 now. With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 13 around 1 PM.
- Present
- AQI 30
- UV peak
- 3.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 13
PM × Wind × Precip
PM10 at 47.3 µg/m³ (AQI 44) with a 0.29 fine-to-coarse ratio under 16 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:47 AM
- Moonset
- 8:23 PM
- In sign
- ♊︎ Gemini
Summer solstice light stretched thin
Johannesburg at a glance
- Today vs. normal: 78°F — typical for the season
- Last frost: March 19 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
15-Day Forecast — Johannesburg
- Mon98°72°0%
- Tue98°74°0%
- Wed97°66°0%
- Thu95°63°0%
- Fri90°59°0%
- Sat89°55°0%
- Sun91°54°0%
- Mon96°59°0%
- Tue96°61°0%
- Wed96°63°0%
- Thu88°60°0%
- Fri86°55°0%
- Sat86°54°0%
- Sun90°54°3%
- Mon94°56°3%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 15, 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