SA Weather Update: Fog and Cool Conditions in the Forecast for Monday, 18 August 2025

South Africa enters Monday, 18 August 2025, under a weather regime characterised by widespread morning fog patches and generally cool conditions affecting most provinces. The South African Weather Service (SAWS) highlights a mix of fog, partly cloudy skies, and variable temperatures as winter weather continues to influence regional patterns. This update delivers important weather warnings and conditions across the country to keep residents informed and prepared.

SEE FULL FORECAST: Today’s Weather Forecast – Monday, 18 August 2025

National Weather Overview

The day starts with dense morning fog expected in multiple provinces including Mpumalanga, Limpopo, coastal Northern Cape, Western Cape, parts of Eastern Cape, and KwaZulu-Natal. These fog patches will reduce visibility, especially during early morning hours, making driving caution essential.

Across the country, temperatures will remain cool in the mornings, with daytime highs rising to mild levels by afternoon. Most provinces will experience partly cloudy skies, with isolated showers forecast mainly over eastern and northeastern regions.

Provincial Weather Warnings and Updates

Widespread morning fog and cool conditions dominate South Africa’s weather on 18 August 2025. Fire danger alerts active in Eastern and Northern Cape. Stay updated with provincial weather warnings and safety advice.

Gauteng

The province will remain partly cloudy and cool throughout the day. No significant rainfall is expected. UVB sunburn levels are high, so residents should use sun protection when outdoors.

Mpumalanga

Morning fog blankets the Highveld before clearing to cool, partly cloudy conditions. Light drizzle is anticipated along escarpment zones. Eastern Mpumalanga will see slightly warmer temperatures.

Limpopo

Fog patches appear widely in Limpopo’s morning skies, clearing to partly cloudy, cool to warm conditions later. Isolated showers will provide moisture to eastern districts. Residents should drive cautiously during foggy periods.

North West

The day features partly cloudy to clear skies with cool to warm temperatures. Winds will gust moderately, especially along open terrain. Conditions remain relatively dry with no major weather disruptions.

Free State

Expect partly cloudy and windy weather with stable cool conditions. Winds may intensify briefly but generally stay within safe limits.

Northern Cape

Morning fog is concentrated along coastal and low-lying areas. Elsewhere, conditions are partly cloudy, windy and cool to warm. The extreme south of the province will experience colder conditions.

Western Cape

Morning fog affects southern and southwestern areas before skies clear to fine, cool to warm weather. Coastal winds will shift from northwest to southwest by afternoon. UVB sunburn index rates as moderate.

Eastern Cape

Fog patches are forecast for the western half in the morning, followed by fine, cool to warm weather. In the eastern half, morning fog gives way to partly cloudy skies with isolated showers and thundershowers later in the day. Coastal winds are light to moderate.

KwaZulu-Natal

Interior areas experience morning fog before turning partly cloudy and cool to warm. Isolated showers and rain occur mainly in the extreme northeast. Coastal winds strengthen from north-northeast in the morning to strong conditions by afternoon. The UVB sunburn index is very high, requiring strong sun protection.

Fire Danger Alerts

Extremely high fire danger warnings remain in place in the Dr Beyers Naude local municipality of the Eastern Cape and the Kareeberg local municipality of the Northern Cape. Residents in these regions must avoid open flames and practise extreme caution with any activities that could spark fires.

Travel and Safety Advice

• Exercise extreme caution when driving in fog-affected areas due to low visibility.
• Use sunscreen and protective clothing when outdoors because of high UVB radiation.
• Avoid outdoor fires in regions with extreme fire danger warnings.
• Stay updated with official weather information throughout the day.

Stay Safe

As South Africa navigates the widespread fog and cool conditions forecast for Monday, 18 August 2025, staying informed and cautious is crucial. The combination of reduced visibility and fire danger in specific regions calls for careful planning and responsible behaviour. By following safety advice, using sun protection, and remaining vigilant especially while driving, residents can protect themselves and their communities. Embracing these recommendations will help everyone safely experience the changing winter weather across the country.

This weather alert reminds South Africans to remain vigilant and plan activities carefully amid widespread fog and cool conditions on 18 August 2025.