What’s the weather at La Mongie / Barèges today? The current La Mongie / Barèges weather is: Mostly Sunny, 14 C° base and 11 C° Summit, 6 km/h wind. Scroll down to Hour by Hour for an hourly La Mongie / Barèges weather forecast breakdown for a detailed La Mongie / Barèges weather and snow forecast for the next seven days.