Gauteng Braces for Storms as Pretoria Enjoys Sunny Escape

Key facts

• Johannesburg: daytime high 16°C, overnight low 4°C, southwest winds 15 km/h gusting 41 km/h.
• Pretoria: daytime high 20°C, overnight low 5°C, southwesterly winds 15 km/h gusting 39 km/h.
• Cape Town: daytime high 19°C, overnight low 11°C, southeasterly winds 22 km/h gusting 35 km/h.
• Free State and Northern Cape face moderate to heavy rain with possible localised flooding.
• Mpumalanga records warmest conditions at 25°C in Mbombela.
• National average temperature stands at 17°C.
• Cape Town evening: 98% cloud cover, 59% precipitation probability, 0.6 mm rain expected.
• Johannesburg humidity at 85%, adding to muggy feel.

A Tale of Two Cities: Stormy Johannesburg, Sunny Pretoria

Johannesburg and Pretoria, separated by just 56 kilometres, will experience vastly different weather on Thursday, 30 April 2026. While the economic hub endures overcast skies and a biting 4°C overnight low, the administrative capital enjoys a mostly sunny 20°C high. The divergence underscores the unpredictable nature of Gauteng's autumn weather, driven by a band of unsettled air sweeping across the country. Forecasts indicate Johannesburg will see a daytime high of 16°C under sunshine and some cloud cover, with southwest winds at 15 km/h gusting to 41 km/h. No rain is expected, but the city will cool sharply after sunset. In contrast, Pretoria's southwesterly winds of 15 km/h gusting 39 km/h accompany clear skies, with an overnight low of 5°C. The capital's residents can expect a crisp but dry evening.

Cape Town: Clear Days, Stormy Nights

Cape Town is forecast to enjoy mostly sunny weather on Thursday, with temperatures peaking at 19°C and a mild overnight low of 11°C. Southeasterly winds at 22 km/h gusting 35 km/h will keep coastal areas fresh. However, the evening brings a dramatic shift: cloud cover will increase to 98%, with a 59% probability of precipitation and 0.6 mm of rain expected overnight. A north-northwesterly wind will strengthen to 30 km/h with gusts up to 61 km/h, and a 12% chance of thunderstorms looms. The UV index remains low at 1, reflecting limited sunshine due to thick cloud cover during the day. Sunrise is at 7:21 am and sunset at 6:05 pm. The Mother City's day will be pleasant, but residents should prepare for a windy, wet night.

Free State and Northern Cape: Heavy Rain and Flooding Risks

Significant rainfall has developed over the Free State and Northern Cape, where moderate to heavy rain is expected to persist throughout Thursday. Bloemfontein will see temperatures between 11°C and 13°C, while Kimberley records 12°C to 13°C. The national weather service warns of possible localised flooding in low-lying areas, urging drivers to reduce speed and allow extra travel time. Disrupted travel conditions are anticipated as the rain continues. This band of unsettled weather contrasts sharply with the clearer conditions in Gauteng and the Western Cape. The Free State and Northern Cape are bearing the brunt of the system, which is expected to bring sustained rainfall through the day.

Mpumalanga and KwaZulu-Natal: Warm and Humid

Mpumalanga records the warmest conditions in the country, with Mbombela reaching 25°C under broken clouds. Humidity is high at 82%, with light north-easterly winds at 6 km/h. The Lowveld region will experience warm, humid conditions, while the Highveld areas near Ermelo and Secunda will be cooler. No rain is forecast, but cloud cover will limit sunshine. Durban, in KwaZulu-Natal, will see overcast conditions with temperatures between 19°C and 22°C. A north-easterly breeze at 10 km/h and humidity of 61% will keep the coastal city mild but cloudy. Inland areas, including Pietermaritzburg, will experience similar cloud cover with slightly cooler temperatures. No significant rainfall is expected, though conditions remain unsettled.

National Outlook: Average Temperatures and Regional Contrasts

The national average temperature stands at 17°C, with the central interior experiencing the coolest and wettest weather. Gauteng and surrounding provinces will see overcast skies keeping temperatures moderate, making extreme heat unlikely. Coastal areas, particularly Cape Town, will enjoy clearer conditions, though a southerly wind will be noticeable along the Western Cape shoreline. Strong northerly winds in Gauteng, gusting up to 27 km/h, contribute to cool morning conditions, with humidity at 85% adding to the muggy feel. The weather pattern highlights the stark regional contrasts typical of South African autumn, where a single weather system can bring storms to one province and sunshine to another.

The bottom line

• Johannesburg faces a cold day (16°C high) and a chilly 4°C night, while Pretoria enjoys a warmer 20°C high and clear skies.
• Cape Town's day is sunny and mild (19°C high), but evening brings strong winds (gusts up to 61 km/h) and a 59% chance of rain.
• Free State and Northern Cape experience moderate to heavy rain with localised flooding risks, disrupting travel.
• Mpumalanga records the warmest temperature at 25°C in Mbombela, with high humidity and broken clouds.
• National average temperature is 17°C, with Gauteng's humidity at 85% contributing to muggy conditions.
• The weather system creates a sharp divide: storms and rain in the interior, clear skies along the Cape coast.