Present-day requirements emphasize the need of saving energy. It relates mainly to industrial
companies, where the minimization of energy consumption is one of their most important tasks they
face. In our paper, we deal with the design of the so-called weather prediction system (WPS) for the
needs of a heating plant. The primary task of such a WPS is timely predicting expected heat consumption
to prepare the technology characterized by long delays in advance. Heat prediction depends primarily on
weather so the crucial part of WPS is the weather, especially temperature[7TD$DIF], prediction. However, a
prediction system needs a variety of further data, too. Therefore, WPS must be regarded as a complex
system, including data collection, its processing, own prediction and eventual decision support. This
paper gives the overview about existing data processing systems and prediction methods and then it
describes a concrete design of a WPS with distributed data measuring points (stations), which are
processed using a structure of neural networks based on multilayer perceptrons (MLP) with a
combination of fuzzy logic. Based on real experiments we show that also such simplemeans as MLPs are
able to solve complex problems. The paper contains a basic methodology for designing similar WPS, too.