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01

Why South African weather is so varied

South Africa stretches from the warm Indian Ocean coastline in the east to the cooler Atlantic waters in the west, with a high interior plateau in between. This combination of coastlines, mountain ranges and altitude differences means that weather conditions can vary enormously between regions on the same day. A winter cold front moving across the Western Cape may bring rain and wind to Cape Town while the Highveld around Johannesburg stays dry and sunny.

The influence of two oceans

The Indian Ocean on the east coast is warmer, which contributes to higher humidity and summer rainfall in provinces such as KwaZulu-Natal and Mpumalanga. The Atlantic Ocean on the west coast is cooled by the Benguela Current, keeping areas like the West Coast and parts of the Western Cape drier and less humid, with winter rainfall rather than summer rainfall.

Altitude and the interior plateau

Much of the country's interior sits on a high plateau, generally between 1,000 and 1,800 metres above sea level. This altitude moderates temperatures, meaning that even in summer, nights can be cool, and in winter, frost is common in many interior regions. Thunderstorms are a defining feature of summer afternoons on the Highveld, often building quickly and bringing heavy rain, lightning and occasionally hail.

02

The main seasons

South Africa's seasons are the reverse of those in the northern hemisphere, since the country lies in the southern hemisphere.

• Summer (December to February): Hot in most of the country, with afternoon thunderstorms common in the interior and along the east coast.
• Autumn (March to May): A transitional period with gradually cooling temperatures and reduced rainfall in summer-rainfall regions.
• Winter (June to August): Cold fronts bring rain to the Western Cape, while the rest of the country tends to be dry, cold at night and mild during the day.
• Spring (September to November): Temperatures rise again, winds can pick up, especially in the Western Cape, and the first summer storms begin to appear in the interior.

03

Rainfall regions

One of the most important distinctions in South African weather is between winter-rainfall and summer-rainfall areas. The Western Cape and parts of the southern coast receive most of their rain during the cooler months, driven by cold fronts moving in from the Atlantic. The rest of the country, including the Highveld, KwaZulu-Natal and the northern provinces, receives most of its rain during the summer months, usually from convective thunderstorms rather than frontal systems.

This difference has a major effect on agriculture, water supply planning and even tourism, since the best time to visit a particular region often depends on which rainfall pattern it follows.

04

Extreme weather events

South Africa experiences a range of extreme weather events, though their frequency and intensity vary by region and year. These include severe thunderstorms with hail and lightning, particularly on the Highveld in summer, strong winds and heavy rain associated with cold fronts in the Western Cape, and periods of drought that can affect large parts of the country, sometimes lasting several seasons. Coastal areas can also be affected by cut-off low pressure systems, which bring prolonged heavy rainfall and flooding risk, especially along the eastern and southern coastlines.

05

How forecasting works in South Africa

Weather forecasting in South Africa relies on a combination of satellite imagery, weather radar, surface weather stations and computer models that simulate how the atmosphere will behave over the coming days. Because of the country's complex terrain, oceans on two sides and the influence of both tropical and temperate weather systems, local forecasting can be more challenging than in regions with simpler, more uniform climates.

Short-term forecasts, covering the next one to three days, tend to be the most reliable, particularly for predicting rainfall, temperature and wind. Longer-range outlooks, looking a week or more ahead, are useful for identifying general trends, such as an approaching cold front or a period of hot, dry weather, but are less precise about exact timing and amounts.

06

Using this site

The pages on this site go into more detail on specific aspects of South African weather, including regional differences and how to read a weather forecast more effectively. The aim is to help visitors understand not just what the weather will be, but why it behaves the way it does in this part of the world.