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 temperature of 25°C, while the coldest months are July and June, with an average of 17°C. The rainiest months in Grootfontein are January, February, December and March, with each month seeing an average of 176 mm of rainfall.