worldweather18°Cexceptionally cool
usually 23°C–28°C
cooler than 95% of similar days
night: exceptionally warm
rain: more rain than usual
wind: stronger than usual
Weather in Johannesburg - 14-day forecast
Detailed weather forecast for Johannesburg, South Africa: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.
Forecast for the next days in Johannesburg
today🌧️
18°💧 0.2 mm
Sun🌧️
17°💧 12.8 mm
Mon🌧️
13°💧 2.2 mm
Tue☀️
17°💧 0.9 mm
Wed🌤️
19°💧 0.1 mm
Thu☁️
21°night 20°
Fri🌤️
22°night 20°
Sat☀️
22°night 20°
Forecast vs 1991-2020 climate normal
NASA POWERHow does the current forecast compare with normal?
We compare the coming days with weather usually observed at this time of year.
Monday 7 Sept in Johannesburg, the forecast high is 13°C. Typical daytime temperatures at this time of year range from 23°C to 29°C, so it will be exceptionally cool. It is cooler than 99% of similar days.
17°Cexceptionally cool
usually 23°C–29°C
cooler than 96% of similar days
night: exceptionally warm
rain: exceptionally wet
wind: typical
13°Cexceptionally cool
usually 23°C–29°C
cooler than 99% of similar days
night: exceptionally warm
rain: exceptionally wet
wind: typical
17°Cexceptionally cool
usually 23°C–29°C
cooler than 96% of similar days
night: exceptionally warm
rain: exceptionally wet
wind: lighter than usual
19°Cexceptionally cool
usually 23°C–29°C
cooler than 94% of similar days
night: exceptionally warm
rain: more rain than usual
wind: exceptionally light
21°Cexceptionally cool
usually 24°C–29°C
cooler than 91% of similar days
night: exceptionally warm
rain: typical rainfall
wind: exceptionally light
22°Ccooler than usual
usually 24°C–30°C
cooler than 87% of similar days
night: exceptionally warm
rain: typical rainfall
wind: exceptionally light
How warm was this week in previous years?
Each bar shows the average daily high during the same 7-day period in each year.
cooler yearstypical rangewarmer years2026 forecastcurrent forecast
From 1981 to 2025, the 5-11 Sept period averaged 26°C by day. The coolest year was 1997 (19°C) and the warmest was 2008 (30°C). The current forecast averages 18°C - lower than in 100% of historical years.
Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.
14-day forecast - Johannesburg
Johannesburg 30 & 45-day weather - long-range outlook
Next 16 days · forecast
20°
around 18° at night · days with rain: 7
Weeks 3-4 · avg for September
26°
around 11° at night · rain chance 0%
Weeks 5-7 · avg for October
27°
around 12° at night · rain chance 0%
The 30 & 45-day outlook for Johannesburg: the next 16 days are a numerical forecast updated daily - on average 20° by day and 18° at night. Further out we rely on multi-year climate averages: around 26° in September, and about 27° in October. Forecasts beyond two weeks are indicative only.
Day-by-day forecast for Johannesburg
Saturday5 September 2026
🌧️18°light rain
Sunday6 September 2026
🌧️17°heavy rain
Monday7 September 2026
🌧️13°light rain
Tuesday8 September 2026
☀️17°clear sky
Wednesday9 September 2026
🌤️19°scattered clouds
Thursday10 September 2026
☁️21°overcast clouds
Friday11 September 2026
🌤️22°a few clouds
Saturday12 September 2026
☀️22°clear sky
Sunday13 September 2026
☀️21°clear sky
Monday14 September 2026
☀️22°clear sky
Tuesday15 September 2026
☁️23°broken clouds
Wednesday16 September 2026
☀️26°clear sky
Thursday17 September 2026
☀️22°clear sky
Friday18 September 2026
🌧️22°light rain
Saturday19 September 2026
🌧️14°moderate rain
Sunday20 September 2026
🌤️18°a few clouds
UV index in Johannesburg - is it safe to sunbathe?
Today the UV index in Johannesburg is 7 (high) - unprotected fair skin can burn in about 25 minutes. SPF 30-50, a hat and sunglasses are a must. Better stay in shade between 11:00 and 15:00.
Air quality and smog in Johannesburg
Air quality in Johannesburg is currently very good. Fine particulate PM2.5: 7.3 µg/m³, PM10: 7.7 µg/m³.
| City | PM2.5 (µg/m³) | PM10 (µg/m³) | Air quality |
|---|---|---|---|
| Johannesburg | 7.3 | 7.7 | very good |
Based on PM2.5 thresholds. Station readings, updated daily (last reading: 2026-09-05, 03:00).
Johannesburg weather through the year
Warmest, driest months on average: January, February, March, April.
Upcoming public holidays in South Africa: Heritage Day — 24 September · Day of Reconciliation — 16 December · Christmas Day — 25 December.
Nearby and related places
FAQ - Johannesburg weather
What is the weather like in Johannesburg today?
Today it is about 18° during the day and 14° at night, light rain.
How far ahead can I check the forecast for Johannesburg?
This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.