South Africa has been favored by nature with one of the most temperate climates on the African continent, and plenty of sunny, dry days. The main factors influencing conditions are altitude and the surrounding oceans. Basically, the farther east you go, the more handy your rain-gear becomes, but there are also damp pockets in the south-west, particularly around Cape Town.

The coast north from the Cape becomes progressively drier and hotter, culminating in the desert region just south of Namibia. Along the south coast the weather is temperate, but the east coast becomes increasingly tropical the further north you go. When it gets too sticky, head for the highlands, which are pleasant even in summer. The north-eastern hump gets very hot and there are spectacular storms there in summer. In winter the days are sunny and warm.
http://www.weathersa.co.za/

South Africa is 2 hours ahead of Greenwich Mean Time (GMT), one hour ahead of central European Winter Time, 10 hours behind New Zealand Winter Time, 8 Hours behind Eastern Australian Winter Time.

The greater part of South Africa has a very sunny climate with much fine, settled weather. In few parts of the country are the weather and climate unhealthy or likely to cause great discomfort or stress.

Daily sunshine hours are high over most of the country, averaging eight to ten hours a day around the year. In South Africa the dress code is generally casual (denims, t-shirts, skirts etc.) when you are not working as the weather is mostly hot. When at work the dress code is more formal e.g. Knee length skirt, blouse and on cool days a matching jacket.

Except for the upper-class restaurants, your casual wear will be just fine in most restaurants. Men are required to wear a shirt (can be casual) with a collar to clubs and for some silly reason many clubs don't allow 'takkies' (running shoes).

General Business Hours in South Africa are fairly constant all year round.

Most businesses operate from 08:00 to 17:00 from Monday to Friday.

Government offices usually operate from 07:30 to 16:00 from Monday to Friday.

Many shopping malls and centers have extended trading hours and are open on Sundays.

The electric current in South Africa is 220/230 volts at 50 cycles. Electrical plugs with two rounded pins are the most widely used.

The currency unit is the Rand, denoted by the symbol R, with 100 cents making up R1 (one Rand). Foreign currency can be exchanged at local banks and Bureaux de Changes. Most major international credit cards such as American Express, Diners Club, MasterCard, Visa and their affiliates are accepted for most purchases.

Visas are not required for travelers from the United Kingdom, USA, Canada, Australia, Japan, Other EU Countries, Iceland, Israel, Liechtenstein, Monaco, New Zealand, Norway, Singapore and Switzerland for stays of up to 90 days.

Nationals of Cyprus, Hungary, Poland, Slovak Republic, Hong Kong (SAR) (Holders of Hong Kong British Nationals overseas passports and Hong Kong special passports), Korea (Rep), Macau (SAR), Malaysia, Thailand and Turkey do not require visas for stays of up to 30 days. All other countries, (including Estonia, Latvia, Lithuania and Slovenia) require visas.

More reference here: http://www.southafrica.ae/consular_services_visas_business.htm