'Significant accumulations of rain in a short period of time are to be feared, but also a risk of hail and gusts of wind. 'Across the country, temperatures are expected to range between 12 and 17 degrees across the northeast of the country on September 21, exceeding to between 21 and 26 degrees near the Mediterranean.In Marseille, Paris Saint-Germain's highly anticipated Ligue 1 match with Marseille has been postponed by a day due to the severe weather conditions in the Bouches-du-Rhone region.Announcing the news, a statement released by Marseille, said: 'Olympique de Marseille acknowledges the decision of the Bouches-du-Rhône Prefecture to postpone the OM - PSG match, initially scheduled for this evening, for security reasons linked to the weather conditions in the region. 'As communicated by the Professional Football League, and in accordance with its regulations, the match is rescheduled for this Monday, September 22 at 8 p.m., at the Orange Velodrome. 'The club informs its supporters that tickets purchased for tonight's match will remain valid for tomorrow's rescheduled match. 'Olympique de Marseille regrets that the conditions are not right to play the match this evening, both for its players, for its mobilised supporters already present, and for the full visibility of the event.