If you're hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Punakaiki: The hottest months are usually February and January, with an average temperature of 16°C, while the coldest months are July and August, with an average of 10°C. The rainiest months in Punakaiki are May, September, December and October, with each month seeing an average of 320 mm of rainfall.