Dlamini BlessingJohannesburg is known for its high altitude and sunny climate. Its weather is generally pleasant, but it is defined by distinct seasons and dramatic summer afternoon thunderstorms. Understanding the city’s weather patterns is key to planning your activities and staying safe throughout the year. This guide provides a month-by-month overview based on long-term averages, along with the latest forecasts and essential safety tips for 2026.
Weather in Johannesburg (2026): A Complete Guide
General Climate Overview
Located on the highveld plateau at an altitude of nearly 1,800 metres, Johannesburg enjoys a subtropical highland climate. This means the city experiences mild, dry winters and warm, wet summers. The high altitude also means UV levels are extreme, even on cloudy days, and temperatures can drop quickly after sunset.
The weather is characterised by two main seasons:
Summer (October to April): Warm to hot with afternoon thundershowers, often spectacular and short-lived.
Winter (May to September): Mild, dry, and sunny days with cold to very cold nights and clear blue skies.
Month-by-Month Weather Averages for 2026
The following table provides a guide to what you can typically expect each month. Please note that these are long-term averages and actual conditions in 2026 may vary .
Johannesburg Monthly Weather Summary
| Month | Avg Max Temp (°C) | Avg Min Temp (°C) | Avg Rainfall (mm) | Typical Weather & Info |
|---|---|---|---|---|
| January | 28 | 18 | 163 | Hot and wet. Frequent afternoon thundershowers, high humidity, extreme UV. |
| February | 26 | 15 | 93 | Warm to hot, wet. Similar to January with thundershowers. |
| March | 27 | 16 | 90 | Warm, rainfall decreases. Pleasant autumn month. |
| April | 22 | 10 | 56 | Mild days, cool nights. Rain less frequent. |
| May | 22 | 12 | 10 | Sunny, mild days and cool nights. Start of dry season. |
| June | 18 | 8 | 6 | Clear, sunny days. Cold nights and mornings, frost possible. |
| July | 18 | 8 | 1 | Coldest and driest month. Similar to June. |
| August | 23 | 14 | 6 | Dry and pleasant. Days warming, nights still cold. |
| September | 26 | 14 | 12 | Warm days, cool nights. Very low rainfall. |
| October | 28 | 16 | 84 | Warm to hot. First rains and thunderstorms return. |
| November | 28 | 17 | 121 | Warm and wet. Thunderstorms become common. |
| December | 26 | 14 | 113 | Warm and wet. Classic summer pattern: sunny mornings, stormy afternoons. |
What to Expect in 2026: Current Forecasts
While long-term averages are useful for planning, the day-to-day weather in 2026 follows the typical seasonal patterns. As of late February 2026, Johannesburg is in the heart of its summer season.
Here is the forecast for the coming days based on recent reports:
Thursday, 26 February: A warm day with a mix of sun and clouds, reaching a high of 28°C. There is only a slight chance of rain during the day, but the night will become cloudier with a possibility of a late thundershower .
Friday, 27 February: Partly sunny and warm with a high of 27°C. The chance of precipitation is around 25% during the day. The night will be partly cloudy with an increased chance (around 55%) of a thunderstorm, with a small amount of rain possible .
Saturday, 28 February: The weekend is expected to start with showers and thundershowers. Temperatures will range from a minimum of 17°C to a maximum of 27°C, with around 3mm of rain forecast .
Sunday, 1 March: Conditions are expected to improve significantly, with a partly cloudy and fine day forecast. No rainfall is expected, and temperatures will be pleasant, ranging from 17°C to 29°C .
Essential Weather Safety Tips for Johannesburg
Navigating Johannesburg’s weather requires some local knowledge, especially during the summer storm season.
Beware of Afternoon Thunderstorms: From around October to April, it is common for beautiful, sunny mornings to give way to dramatic, short-lived thunderstorms in the afternoon or early evening. If you are hiking or planning outdoor activities, it is wise to start early in the day.
Extreme UV Index: The sun’s rays are very strong due to Johannesburg’s high altitude. The UV index often reaches extreme levels (11+). Always wear a hat, sunglasses, and high-SPF sunscreen, even on overcast days .
Cold Winter Nights: While winter days are sunny and pleasant, temperatures can drop close to freezing (around 4°C) at night and in the early mornings. If you are visiting in June or July, pack warm clothing, including a jacket, scarf, and gloves for the evenings.
Driving in Summer Storms: When a summer thunderstorm hits, visibility can drop to near zero, and roads can become slippery and flooded within minutes. If you are driving, it is safest to pull over and wait for the storm to pass, which it usually does quite quickly.
Heed Weather Warnings: The South African Weather Service (SAWS) issues warnings for severe weather. A “Yellow Level 2” warning, for example, indicates a moderate risk of impact from severe thunderstorms, which could include localised flooding, damaging winds, and excessive lightning. Stay informed by checking local news or weather apps .