Johannesburg is in for a turbulent, wet, and significantly cooler weekend as a powerful Cut-Off Low (COL) pressure system moves in. The South African Weather Service (SAWS) has issued an alert for severe thunderstorms and heavy downpours, putting Gauteng firmly in the high-risk zone from Saturday, 15 November, through Monday, 17 November 2025.
SAWS forecasts rainfall probabilities across Johannesburg and wider Gauteng to range between 60% and 80%. This signals a high likelihood of not only persistent showers but also sudden, intense cloudbursts and violent thunderstorm activity throughout the weekend.
The system will also usher in a notable cold snap, bringing a distinctly chilly edge that will rapidly drop daytime temperatures for mid-November.
What to brace for this weekend
Johannesburg residents should brace for four major risks as the cut-off low system moves in. First, intense thunderstorms are expected to bring strong, damaging winds and frequent lightning, which could strain infrastructure and lead to power outages or localised damage.
The most serious threat is flash flooding, as sustained heavy rain may overwhelm stormwater systems, especially in low-lying areas, flood-prone neighbourhoods, and busy intersections.
In addition, the combination of persistent rainfall, poor visibility, and rapidly forming surface water will create hazardous travel conditions, likely causing traffic delays and increasing the risk of accidents across the city.
The storm timeline
The slow-moving nature of a Cut-Off Low means the severe weather will linger:
- Saturday (15 Nov): Storms are set to build rapidly over the central interior before pushing aggressively into Gauteng. Johannesburg is covered in a wide band of 60–80% rainfall probability, with showers intensifying, particularly in the afternoon and evening.
- Sunday (16 Nov): The system continues to influence the region. Expect ongoing, persistent showers and widespread thunderstorms. Conditions will remain cool, with possible storm peaks in the late afternoon.
- Monday (17 Nov): Lingering showers and cooler conditions are likely before the system finally shifts eastwards.
Why this warning matters
Cut-Off Lows are notorious for their widespread impact and high flood risk (think KZN floods circa 2022). For a metropolitan area like Johannesburg, rapid urban stormwater runoff means that even brief bursts of intense rain can quickly form hazardous flash floods.
Commuters, weekend travellers, and anyone planning outdoor activities are strongly urged to plan accordingly. Road conditions are expected to be hazardous, especially given the increased end-of-year traffic.
Whether you're heading out or staying in, Johannesburg's weekend is shaping up to be stormy and unpredictable. Pack a rain jacket, avoid non-essential travel, and most importantly: drive cautiously and stay weather-smart.
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