PARIS (Reuters) – An early heat wave is expected to hit France this week, the state forecaster Meteo France said on Sunday, with temperatures reaching up to 38 Celsius (100 Fahrenheit) in the south. The heat wave will affect the southern part of the country first, although how far it will spread to the north is uncertain, Meteo France said. Temperatures could reach 35 to 38 degrees Celsius from the middle of the week until the weekend, and are not expected to drop below 20 degrees, the meteorological service predicted. Meteo France said this year’s heat wave is set to arrive unusually early, w…