Visiting local bars in Haast is more fun when you know what the weather holds. These temperatures and rainfall averages can help you determine the best time for bar hopping. The hottest months are usually February and January with an average temp of 57°F, while the coldest months are July and August with an average of 45°F. The rainiest months in Haast are May, December, January, and October, with each month seeing an average of 17 inches of rainfall.