Research from the University of the Western Cape suggests that between 70% and 80% of South African small businesses fail within their first five years. Inadequate planning and strategy are among the challenges they face.

Planning becomes especially important when customer demand starts to change. If a business doesn’t anticipate what customers will need, it may end up with excess stock, empty shelves or too little capacity to fulfil orders on time.

Supply chain forecasting can help businesses prepare for these shifts. But what does it involve, and how can South African companies use it to make smarter purchasing, inventory and logistics decisions?

What Is Supply Chain Forecasting?

Supply chain forecasting is the process of using data and market information to estimate future demand and determine what the supply chain will need to meet it.

It forms an important part of supply chain planning. A reliable forecast can help a business decide how much stock to purchase, when to replenish inventory, how much warehouse space to reserve and whether additional transport or labour will be required.

Consider a South African e-commerce retailer preparing for Black Friday and the festive season. If demand is expected to rise, the business may need to order more stock, secure additional warehouse capacity and arrange deliveries well before sales peak.

The earlier the business identifies likely demand, the more time it has to prepare.

Demand forecasting helps businesses estimate how much of a product or service customers may need during a specific period. To build that estimate, businesses can examine historical sales, seasonal patterns, customer behaviour, market trends and planned promotions.

These insights can guide decisions across the company. Purchasing teams can order stock at the right time and reduce the risk of shortages. Warehouse teams can allocate space and plan labour requirements. Logistics teams can prepare for higher shipping volumes and arrange additional delivery capacity when needed.

That is why forecasting is so closely connected to supply chain logistics management. It does more than predict sales. It helps every part of the supply chain understand what those sales will require.

Demand Is Only One Part of the Picture

Customer demand may sit at the centre of a forecast, but it isn’t the only factor a business should consider. Depending on its operations, a company may also need to forecast:

• Inventory levels

• Raw material requirements

• Stock replenishment

• Supplier capacity

• Warehouse space

• Transport requirements

• Labour and operational capacity

• Order volumes

• Seasonal demand

For businesses importing goods into South Africa, timing is especially important. A forecast should allow for international transport, customs clearance and final delivery. Port congestion, supplier delays and changes in shipping schedules may also affect when stock arrives.

The aim isn’t to predict the future with perfect accuracy. It’s to give the business enough visibility to act before demand arrives.

Here are five commonly used methods:

1. Historical Forecasting

Historical forecasting uses previous sales data to identify recurring patterns and estimate future demand. It can work well for established products with relatively stable sales histories.

Past performance should still be treated with care. A change in pricing, competition or customer preferences can make older sales patterns less reliable.

2. Trend Analysis

Trend analysis examines whether demand is increasing, decreasing or changing over time. It can help a growing business identify longer-term shifts that might not be obvious from month-to-month sales figures.

3. Seasonal Forecasting

Many businesses experience predictable peaks and dips during the year. Seasonal forecasting accounts for periods such as Black Friday, the festive season, back-to-school shopping and industry-specific buying cycles.

Understanding these patterns can help a business order stock early and avoid placing urgent, expensive orders at the last minute.

4. Market-Based Forecasting

Market-based forecasting combines internal sales data with external information, such as economic conditions, industry activity and changes in customer behaviour.

In South Africa, factors such as exchange-rate movements, fuel prices and shifts in consumer spending can affect both demand and supply chain costs. Including these variables can produce a more realistic forecast.

5. Collaborative Forecasting

Collaborative forecasting brings suppliers, sales teams, customers and logistics partners into the planning process. Each party holds different information, so sharing insights can improve visibility across the supply chain.

For example, a sales team may know that a major order is likely to close, while a supplier may be aware of a production delay. Both pieces of information matter when the business plans its inventory and delivery capacity.

Many companies combine several forecasting methods rather than relying on a single model.

A Forecast Only Matters If Your Supply Chain Can Respond

A forecast doesn’t solve supply chain challenges by itself. Its value comes from the decisions a business makes with the information.

If demand is expected to rise, ask practical questions. Can suppliers provide enough stock? Is there sufficient warehouse space? Can the delivery network handle more orders? Will imported goods clear customs and arrive in time?

This is where supply chain management and logistics must work together. A business may forecast demand accurately and still disappoint customers if it cannot move stock quickly enough.

South African businesses serving local and international markets should also build some flexibility into their plans. Actual demand rarely matches a forecast exactly. Flexible purchasing arrangements, appropriate safety stock and dependable delivery options can help a business respond when demand is higher or lower than expected.

• Start with clean data: Incomplete or inconsistent sales and inventory data will weaken the forecast.

• Compare forecasts with actual results: Identify where estimates were accurate and where they missed the mark.

• Update forecasts when conditions change: New competitors, supplier disruptions and changing consumer behaviour can quickly affect earlier assumptions.

• Plan for more than one outcome: Create best-case, expected and worst-case scenarios for important sales periods.

• Keep teams aligned: Purchasing, sales, inventory and logistics teams should work from the same information.

• Speak to suppliers early: Advance notice gives suppliers more time to confirm stock availability and production capacity.

• Account for lead times: Include manufacturing, international transport, customs processing and final delivery in the plan.

The purpose isn’t to eliminate uncertainty. It’s to reduce surprises and give the business more time to respond.

Turn Better Forecasts Into Stronger Supply Chain Decisions

Even the most detailed forecast will never be completely accurate. Customer behaviour changes, suppliers run into delays and market conditions shift. A useful forecast gives your business enough warning to make better decisions despite that uncertainty.

Review assumptions against actual sales and supply chain performance. Adjust forecasts when new information becomes available. Most importantly, make sure the teams responsible for purchasing, inventory and logistics are working towards the same plan.

As your business grows, reliable logistics become just as important as anticipating demand. With DHL Express, businesses can manage shipments through tools such as MyDHL+, which supports shipment preparation, documentation, collection bookings and parcel tracking.

Whether you’re expanding across South Africa or shipping regularly to international customers and suppliers, a DHL Express Business Account can give you access to shipping solutions designed to support a growing supply chain without the unnecessary admin and stress.

FAQs