Winter (June to September): A good time to visit Sossusvlei is during winter. While the nights do get very cold, you can enjoy sunny warm days with day temperatures averaging around 26 °C / 78°F and rain is extremely rare.
The best time for photography is, as always, during the golden hours of dawn or dusk when the dunes take on their most magical hues. One advantage of winter is that a later sunrise means you will be able to sleep in a little later.
Spring (September-November) and Autumn (April – May): The in-between seasons of spring and autum are our favourite time to go to Sossusvlei. The evenings and nights get warmer, and daytime temperatures climb to about 30°C / 85°F and up to 35°C/ 95°F in October and beginning of November.
Since there is only limited vegetation in this area, the contrast between green and dry season is less pronounced than in Etosha for example.
Summer(December to March): Although summer is technically the rainy season in Sossusvlei, precipitation is extremely rare. If you are lucky enough to be visiting in a year where it has rained in the desert, and water has filled the vlei, you can look forward to a visual treat as scores of flamingos and other wild bird flock to temporary lakes before they disappear.
However, summer is also when the heat is at its peak in Sossuvlei, with temperatures up to and beyond 40°C /105°F being very common. The extreme heat in turn often leads to strong gusty winds, which is not ideal when walking on sand dunes, as you may know if you have ever walked on the beach with the wind painfully whipping the sand against you bare legs and face.