In reply to JackM92:
Only just seen your OP. I've just returned from Chamonix having been on the TMB. The locals are saying how bad the weather is for the time of year. Yesterday saw torrential rain in Cham which had fallen as snow above circa(at my estimate)2000m.
I started from Les Houches on 30th August in reasonable weather but from Nant Borrant to the Col de Croix de la Bonhomme the weather was foul with rain, wind and limited visibility. My crossing of the Col de la Seigne was abandoned due to the forecast of even worse conditions. I transferred to Courmayeur by a baggage transfer vehicle. From Courmayeur to Champex I encountered somewhat better conditions but overall the weather pattern was unsettled.