Planning for the weather is an important factor for making your trip to Grootfontein a success, especially when you’re splurging. The hottest months are usually October and November with an average temp of 77°F, while the coldest months are July and June with an average of 62°F. The rainiest months in Grootfontein are January, February, December, and March, with each month seeing an average of 7 inches of rainfall.