Planning for the weather is a good way to make your trip to Las Leñas relaxing and enjoyable, especially when you're splurging. The hottest months are usually January and February, with an average temperature of 9°C, while the coldest months are July and August, with an average of -4°C. The rainiest months in Las Leñas are June, August, July and September, with each month seeing an average of 215 mm of rainfall.