- South Africa will face a cold snap in the interior, with coastal areas experiencing damaging waves and winds, and rain in the south.
- It seems likely that major cities like Johannesburg and Pretoria will have sunny days around 17°C to 22°C, while Cape Town will be cooler at 15°C to 17°C with rain chances.
- The evidence leans toward Durban staying warmer, with temperatures around 21°C to 23°C and mostly sunny conditions.
Weekly Weather Overview
For the week starting June 17, 2025, South Africa is experiencing winter weather with varied conditions. Johannesburg and Pretoria are expected to have daytime temperatures of 17°C to 22°C and nighttime lows around 3°C to 7°C, with mostly sunny skies. Cape Town will be cooler, with daytime highs of 15°C to 17°C and nights around 10°C to 13°C, with some rain chances. Durban remains the warmest, with daytime temperatures of 21°C to 23°C and nights around 11°C to 14°C, mostly sunny. Coastal areas may face damaging waves and winds, particularly from Tuesday to Thursday, while the interior, especially the Western Cape and Northern Cape, may see very cold conditions from Wednesday to Saturday, potentially affecting agriculture.
Major Cities Forecast
Here’s a detailed forecast for key cities for June 17-23, 2025:
| City | Tue Jun 17 (°C) | Wed Jun 18 (°C) | Thu Jun 19 (°C) | Fri Jun 20 (°C) | Sat Jun 21 (°C) | Sun Jun 22 (°C) | Mon Jun 23 (°C) |
|---|---|---|---|---|---|---|---|
| Johannesburg | 18.3 / 5.6 | 18.9 / 5.0 | 18.9 / 6.7 | 19.4 / 2.8 | 17.8 / 2.8 | 16.7 / 2.8 | 17.8 / 3.9 |
| Pretoria | 21.7 / 5.0 | 22.2 / 5.6 | 21.1 / 5.6 | 21.7 / 5.6 | 22.2 / 5.0 | 18.3 / 6.7 | 21.7 / 6.7 |
| Cape Town | 15.6 / 11.7 | 16.1 / 13.3 | 15.0 / 12.2 | 17.2 / 13.3 | 16.7 / 11.1 | 16.1 / 10.6 | 16.7 / 11.1 |
| Durban | 23.3 / 13.3 | 21.7 / 14.4 | 22.2 / 14.4 | 23.3 / 13.9 | 21.7 / 13.3 | 22.2 / 11.7 | 22.2 / 14.4 |
Comprehensive Weather Analysis
South Africa, currently in the midst of winter as of June 17, 2025, is bracing for a diverse weather pattern this week, characterized by a significant cold snap in the interior, potential rain in the south, and strong coastal winds. The forecast, derived from multiple reliable sources including timeanddate.com, weather.com, and Weather25.com, indicates:
- Cold Snap: Very cold conditions are anticipated in the interior of the Western Cape and Northern Cape from Wednesday, June 18, to Saturday, June 21, with daytime temperatures dropping to 10°C and below, which may impact livestock and agriculture.
- Coastal Warnings: Yellow Level 2 and Level 1 warnings for damaging waves and winds are in effect for coastal areas from Tuesday, June 17, to Thursday, June 19, posing risks to navigation and small vessels.
- Rain and Cloudy Skies: Parts of the country, particularly the south and south-west, are expected to experience partly cloudy conditions with chances of rain, while other regions, such as Gauteng and KwaZulu-Natal, may remain mostly sunny.
This overview is based on forecasts and advisories from various platforms, ensuring a comprehensive picture for residents and visitors alike.
Detailed Forecast for Major Cities
The following table provides daily high and low temperatures for key cities, based on data from timeanddate.com for Johannesburg and Pretoria, weather.com for Johannesburg, and timeanddate.com for Cape Town and Durban. Temperatures are in Celsius, reflecting local standards.
| City | Tue Jun 17 (°C) | Wed Jun 18 (°C) | Thu Jun 19 (°C) | Fri Jun 20 (°C) | Sat Jun 21 (°C) | Sun Jun 22 (°C) | Mon Jun 23 (°C) |
|---|---|---|---|---|---|---|---|
| Johannesburg | 18.3 / 5.6 | 18.9 / 5.0 | 18.9 / 6.7 | 19.4 / 2.8 | 17.8 / 2.8 | 16.7 / 2.8 | 17.8 / 3.9 |
| Pretoria | 21.7 / 5.0 | 22.2 / 5.6 | 21.1 / 5.6 | 21.7 / 5.6 | 22.2 / 5.0 | 18.3 / 6.7 | 21.7 / 6.7 |
| Cape Town | 15.6 / 11.7 | 16.1 / 13.3 | 15.0 / 12.2 | 17.2 / 13.3 | 16.7 / 11.1 | 16.1 / 10.6 | 16.7 / 11.1 |
| Durban | 23.3 / 13.3 | 21.7 / 14.4 | 22.2 / 14.4 | 23.3 / 13.9 | 21.7 / 13.3 | 22.2 / 11.7 | 22.2 / 14.4 |
Notes on Data:
- Johannesburg’s forecast shows cold nights, with lows dropping to 2.8°C, indicative of winter conditions.
- Pretoria’s forecast is slightly warmer during the day, with highs up to 22.2°C, and nights around 5°C to 6.7°C.
- Cape Town’s forecast includes rain chances, with temperatures ranging from 10.6°C to 17.2°C.
- Durban remains the warmest, with no rain expected and temperatures consistently above 21°C during the day.
Hourly Insights for Gauteng on June 17, 2025
For Gauteng, specifically on Tuesday, June 17, 2025, the forecast includes detailed hourly temperatures, as reported by various sources:
- Johannesburg: Temperatures range from 8°C at 6:00 AM to 19°C at 12:00 PM, cooling to 10°C by 21:00 PM.
- Pretoria: Temperatures range from 10°C at 6:00 AM to 22°C at 12:00 PM, cooling to 13°C by 21:00 PM.
This hourly breakdown highlights cool mornings (8-10°C) warming to midday highs (19-22°C), with evenings cooling down to 10-13°C, suitable for layered clothing.
Provincial Weather Overview
On Tuesday, June 17, 2025, the weather across South Africa’s provinces, as detailed by various sources, includes:
| Province | Temperature | Wind | UVB Index |
|---|---|---|---|
| Gauteng | Fine and cool but warm in the extreme north | – | High |
| Mpumalanga | Fine and cold to cool, but warm in places in the Lowveld | – | – |
| Limpopo | Fine and cold to cool, but warm in places in the Lowveld and Limpopo Valley | – | – |
| North West | Fine and cool | – | – |
| Free State | Fine and cool | – | – |
| Northern Cape | Cloudy in the morning, otherwise fine, windy and cool to warm but cold in the west | Moderate to fresh south-easterly becoming south-westerly from afternoon, variable from evening | – |
| Western Cape | Fine in the north-east, otherwise partly cloudy and cold to cool but cloudy in the south and south-west with chances of rain | Moderate southerly along the west, south-westerly along the south in the morning, otherwise north-westerly fresh to strong | Low |
| Eastern Cape | Western half: Fine in the north, otherwise partly cloudy and cool but cold in places in the south with isolated showers along the coast, cloudy south of escarpment in the morning; Eastern half: Fine and cool but cold north of the escarpment, partly cloudy in the far west | Western half: Moderate to fresh westerly to south-westerly; Eastern half: Light north-easterly north of East London, otherwise light to moderate south-westerly | – |
| KwaZulu-Natal | Morning fog patches over the extreme north-eastern interior, otherwise fine and cool to warm | Light north-westerly becoming moderate north-easterly from the south from the afternoon, spreading northwards | Very High |
This table underscores the regional diversity, with coastal areas like the Western Cape facing rain and wind, while inland regions like Gauteng remain fine and cool.
Weather Warnings and Advisories
As of June 17, 2025, no active weather warnings are reported for the week ahead. However, earlier warnings for damaging waves and winds along the coast (between Saldanha Bay and Plettenberg Bay) and very cold conditions in the Western Cape and Northern Cape interiors have been noted. Residents should remain cautious, especially in coastal and highland areas, as conditions can change rapidly.
- Coastal Areas: Damaging waves and winds may persist, particularly from Tuesday to Thursday, affecting navigation and small vessels.
- Interior: Very cold conditions (daytime temperatures below 10°C) are expected in the Western Cape and Northern Cape from Wednesday to Saturday, potentially leading to loss of livestock and agricultural production.
Conclusion and Recommendations
This week’s weather in South Africa presents a mix of challenges and opportunities. While Johannesburg and Pretoria may enjoy mostly sunny skies with mild temperatures, Cape Town and coastal areas will need to prepare for rain and wind. The cold snap in the Western and Northern Cape interiors requires attention to agricultural and livestock protection. For the most accurate and real-time updates, residents are encouraged to check South African Weather Service and local weather apps.
This comprehensive forecast aims to equip individuals with the information needed to plan activities, commute safely, and protect against adverse weather conditions.
Sources and Helpful Content