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Weather

As with all Alpine areas, weather conditions here are changeable and walkers should be prepared for all contingencies. So far as walking is concerned, summer is limited to the period July to mid-September, but while daytime temperatures can be very pleasant during settled conditions, perhaps ranging from 25°C to 28°C, heavy rain and even snowfall can occur in midsummer. Even in high summer nights can be cool. Thunderstorms can occur during unsettled periods, and these can be sudden and violent. September is often marked by more settled weather than July or August, but with lower temperatures.

Always check the weather forecast (metéo) before setting out on a walk that will take you high in the mountains. The local tourist office or Bureau des Guides usually display a printed forecast covering a two- or three-day period. Alternatively, telephone 08 92 68 02 38.

Remember that what is a gentle breeze in the valley may be a piercing wind just 300m up the hillside, and as you gain height so the weather intensifies. Should a passing cloud hide the sun, the temperature can drop alarmingly. As a general guide, the temperature drops about 6°C for every 1000m of ascent.