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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the Southampton Wire weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Johannesburg is heading into a mild, dry start to summer, with the live forecast above showing sunny spells and highs around 26°C – a typical December pattern for this high-altitude city, where afternoon thundershowers can arrive quickly.
## What is the weather like in Johannesburg today?
The live forecast above points to a settled morning across the city, with temperatures climbing from a cool 15°C dawn to the mid-twenties by lunch. Johannesburg sits on the Highveld at 1,753 metres, so UV levels are strong even on hazy days, and a light northeasterly breeze keeps the air fresh. This is a classic transitional period between the dry winter and the wetter summer months.
## How does the weather change through the week?
The coming days show little variation – a hallmark of Johannesburg’s stable early-summer climate. Overnight lows stay near 14°C, while daytime highs hover around 27°C. The chance of a late shower increases from Thursday, as moist air creeps up from the Indian Ocean. For a fuller picture of what’s ahead, check the 10 Day Weather Forecast UK page.
Is Johannesburg hotter than coastal cities in December?
Yes, generally. Johannesburg’s inland plateau means less humidity than Durban or Cape Town, but daytime highs often match or exceed those cities, especially before the summer rains settle in.
Does Johannesburg get much rain in December?
December is the start of the wet season. Johannesburg averages about 125mm for the month, but most falls as short, sharp afternoon thunderstorms rather than prolonged drizzle. The Birmingham Weather page shows a very different pattern.
What should I pack for a trip to Johannesburg now?
Light layers for warm days, a jacket for cooler evenings, and sun protection. An umbrella is useful from mid-afternoon, as thundershowers can develop quickly. Check the UK weather hub for comparison.