Planning for the weather is a good way to make your trip to Lacu Rosu relaxing and enjoyable, 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 January and February, with an average of -3°C. The snowiest months in Lacu Rosu are April, January, December and November, with each month seeing an average of 16 cm of snowfall.