Johannesburg is heading into a turbulent and much cooler weekend as a strong cut-off low pressure system moves over Gauteng, bringing a high risk of severe storms, heavy downpours and possible flash flooding.
The South African Weather Service (SAWS) has issued a warning for Saturday, 15 November, through Monday, 17 November, saying the system is expected to trigger widespread thunderstorms and intense rainfall across the province. Rainfall probabilities for Johannesburg remain high at 60% to 80%, signalling a strong likelihood of persistent showers and sudden, intense cloudbursts.
Along with the heavy rain, the system is ushering in a noticeable cold snap, dropping daytime temperatures well below the usual mid-November warmth.
Residents urged to prepare for major risks
SAWS is urging Joburgers to stay alert as the cut-off low brings four major hazards:
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Severe thunderstorms with strong winds and frequent lightning
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Flash flooding in low-lying and flood-prone areas
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Poor visibility and surface water leading to hazardous driving conditions
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Traffic delays and disruptions throughout the city
Emergency services warn that heavy, sustained rainfall is likely to strain stormwater systems, particularly in areas that historically flood quickly during intense storms.
Storm timeline
Saturday (15 Nov):
Storm activity builds rapidly over the central interior before pushing into Gauteng. Johannesburg sits in a broad 60–80% rainfall zone, with thunderstorms intensifying from the afternoon into the evening.
Sunday (16 Nov):
Persistent showers and widespread thunderstorms continue. Temperatures remain cool, and further storm peaks are possible later in the afternoon.
Monday (17 Nov):
Lingering showers and cloudy conditions remain before the system gradually shifts eastwards.
Why authorities are concerned
Cut-off low systems are known for causing widespread damage due to intense, sustained rainfall. SAWS notes that large metros like Johannesburg are particularly vulnerable because fast-moving runoff on paved surfaces can turn brief downpours into dangerous flash floods.
With increased end-of-year traffic already visible on major routes, authorities are encouraging residents to avoid non-essential travel, allow extra travel time, and drive cautiously.
Stay safe this weekend
Residents are advised to keep rain gear close, secure loose items at home, stay away from flooded roads or bridges, and monitor official weather updates throughout the weekend.
Joburg’s weekend weather is expected to be stormy, unpredictable and significantly cooler — a sharp contrast to the heat earlier this week.