Planning for the weather is an important factor for making your trip to La Mongie a success, especially when you’re splurging. The hottest months are usually August and July, with an average temperature of 15°C, while the coldest months are February and January, with an average of 1°C. The rainiest months in La Mongie are June, November, May and April, with each month seeing an average of 192 mm of rainfall.