The South African Weather Service (SAWS) warns that a cut-off low forming west of the country will affect the Western and Northern Cape from Sunday into Monday, bringing a sharp temperature dip for high-lying areas, intermittent showers and thundershowers that may be heavy at times, and very rough seas reaching 4–4.5m.
What to expect and where
The system is set to produce hazardous marine and coastal conditions and localised convective hazards in parts of the south and west. SAWS has issued a Level 2 warning for damaging winds and waves, which may make navigation difficult at sea and place small vessels at risk of capsizing between Table Bay and Cape Agulhas on Saturday and Sunday.
- Very rough seas: 4–4.5m expected from Sunday into Monday along exposed west and south-facing coasts.
- Damaging winds and waves: Level 2 warning between Table Bay and Cape Agulhas on Saturday and Sunday.
- Heavy showers and thundershowers: intermittent, possibly heavy in the Western and Northern Cape with potential for lightning and small hail.
- Fire danger: extremely high conditions forecast in parts of the central and eastern Northern Cape.
Regional SAWS forecasts included in the bulletin set out the following expectations for the weekend into early next week:
| Province / area | Forecast highlights |
|---|---|
| Western Cape | Cloudy and cool to cold, isolated showers and rain; scattered showers over Overberg and western Garden Route; isolated thundershowers in north-eastern parts from afternoon. |
| Northern Cape | Generally warm to hot; showers and thundershowers in western and southern parts by early evening; extremely high fire danger central and east. |
| Coastal winds | Moderate to fresh south-easterly along the coast, reaching strong at times, becoming light and variable in the evening. |
Practical advice — what you should do
People living, working or travelling along the south and west coasts should take precautions now. Practical steps include:
- Avoid unnecessary sea travel and anchoring in exposed bays while warnings are active; small craft should remain ashore.
- Secure loose outdoor items and be prepared for sudden strong gusts along the coast.
- Keep tuned to official SAWS updates and local maritime authorities for changes to the marine warning area and timing.
- If travelling across high-lying areas, allow extra travel time — heavy showers and hail may reduce visibility and road grip.
- Adhere to local fire-safety rules in the Northern Cape where extremely high fire danger is expected; avoid open flames and report any uncontrolled fires promptly to emergency services.
SAWS also notes the potential for large amounts of small hail and lightning in convective cells associated with the cut-off low. Lightning can pose a direct danger to people and infrastructure during thunderstorms; take shelter indoors and avoid open areas and metal structures while storms are active.
Outlook
The system is expected to affect the Western and Northern Cape most strongly from Sunday into Monday, with cooler conditions spreading over high-lying inland areas. The agency’s maps for 12–14 September 2026 show the cut-off low developing west of the country and moving slowly, prolonging unsettled conditions in the south-west. Mariners, coastal communities and visitor operators should plan for several days of rough seas and intermittent heavy showers.
Stay updated via the South African Weather Service for any escalation of warnings or shifts in the affected area.
Key safety note: if you are at sea or on exposed coastal roads and beaches during the warning period, exercise extreme caution and follow advice from maritime rescue services and local authorities.
