Winter daytime highs are about 60, nighttime lows about 20. There's a little snow, but not much and it doesn't last. Humidity is very low. It's a temperate climate, so things brown up, and leaves fall in the autumn. In the highlands, summer daytime highs will be around 70, and winter daytime highs around 25.
Snow can be several feet deep.
The elevation and dryness make the temperatures plummet at night. Since Lesotho is in the southern hemisphere, all the stars are different. The Milky Way is brilliant and you can see in it the black shadows of the various nebulae. Also remember when hiking, if without a compass, the sun will be in the north. Maseru weather is on the FOL home page.