A noticeable shift in the weather is underway across South Africa as a cooler air mass and associated instability push into the interior and eastern regions this week.

The South African Weather Service (SAWS) has issued a Yellow Level 2 impact-based warning for severe thunderstorms over the Mpumalanga Highveld, the south-western parts of Limpopo, and most of Gauteng (excluding the south-western corner). The warning highlights the risk of:

  • Heavy downpours capable of causing localised flooding of roads, low-lying areas and bridges
  • Strong, damaging winds
  • Hail
  • Excessive lightning

These conditions raise the possibility of damage to settlements, infrastructure and power lines in the affected zones.

Gauteng in detail

Monday is expected to remain relatively warm, with Johannesburg reaching approximately 26–27 °C and Pretoria climbing to 28–29 °C under partly cloudy skies and isolated showers or thundershowers. From Tuesday the atmosphere turns markedly cooler. Johannesburg is forecast to struggle to 21 °C, while Pretoria is likely to peak around 25 °C. By Wednesday, Johannesburg could see a high of only about 20 °C. Showers and thundershowers remain possible each day, so outdoor plans should include contingency for wet weather.

Provincial outlook

  • Mpumalanga: Morning fog along the escarpment is likely, followed by cloudy and cool to cold conditions. Isolated showers and thundershowers will become scattered over the Highveld.
  • Limpopo: Similar morning fog along the escarpment, then partly cloudy, windy and cool to warm with isolated to scattered showers and thundershowers, particularly in the extreme south. The east is expected to remain cloudy.
  • KwaZulu-Natal: Cloudy and cool to cold with scattered showers and thundershowers. Coastal temperatures in Durban are expected to stay in the high teens (18–20 °C). Inland areas such as Pietermaritzburg and Newcastle will be slightly warmer but still unsettled.
  • Free State: Showers and thundershowers are forecast. Bloemfontein is expected to reach about 25 °C on Monday before cooling to around 22 °C on Tuesday.
  • Eastern Cape and parts of the Northern Cape: Isolated showers are possible, with cooler conditions continuing.

Motorists are strongly advised to reduce speed, increase following distances and avoid flooded roads. Residents in the warning areas should secure outdoor furniture, clear drains where possible, and stay updated via official SAWS channels or weather apps. The combination of heavy rain and lightning also raises the risk of power interruptions and lightning-related incidents.

The cooler, unsettled pattern is expected to dominate through at least midweek before a gradual improvement later in the week. Insight Factor will provide further updates as the system evolves.