Weather is probably a major factor when you plan your trip to Haast, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually February and January, with an average temperature of 14°C, while the coldest months are July and August, with an average of 7°C. The rainiest months in Haast are May, December, January and October, with each month seeing an average of 444 mm of rainfall.