15-Day Weather Forecast - Johannesburg
15-day weather forecast for Johannesburg: temperatures from 5°C (41°F) to 22°C (72°F). Average daily high 20°C (68°F) over the next 15 days.
Hourly Forecast by Day
15-Day Temperature Trend
15-Day Weather Forecast
Updated just nowWeather Insight
Johannesburg's 15-day outlook ranges from a low of 5°C to a high of 22°C, with an average daytime high near 20°C. That's 6° below the long-term average high of 26°C for this time of year. Air quality is currently Unhealthy for Sensitive Groups (AQI 136), driven mainly by O₃ at 182 μg/m³.
Today vs Normal
The long-term average high for today is 26°C.
16 of the last 28 days with published data ran above normal.
That's a break from the pattern - today's forecast runs below normal even though the recent stretch mostly ran above.
Red = above normal, blue = at or below · last 12 days
Air Quality
Health effects can be felt by sensitive groups, including children, older adults, and people with respiratory or heart conditions. The general public is less likely to be affected.
Extended Outlook for Johannesburg
Over the next 15 days, Johannesburg is forecast to see temperatures ranging from 4°C to 23°C, averaging a daily high of 20°C. The extended outlook indicates occasional showers on 5 days, with 22.4 mm total accumulation. Conditions are suitable for most outdoor activities; carry an umbrella on days with showers.