Rome, July 22 - The moderately warm summer weather in Italy is about to become a lot hotter, a weather expert warned Monday. New tropical air blowing up from Africa will be bringing temperatures as high as 40 degrees C by Thursday and lasting through the weekend, forecasters say. "For the next 10 days, temperatures will increase gradually until it touches the peak over the weekend with 40 degrees," said Massimiliano Pasqui of the National Research Council. Temperatures will feel even worse in cities, he added. The hot weather system from Africa will reach the northern parts of Italy as well, before receding back into the south. Summer 2013 has been relatively moderate – but that's about to change, said Pasqui.