In March, the weather in Invercargill is typically warm. Average daily high temperature in March is about 16 degrees above zero. On average, Invercargill has 15 rainy, 8 partly cloudy, 5 cloudy, and 3 sunny days in March. The rains are usually heavy. March as well as April, May, June, and July is considered the most uncomfortable time to visit Invercargill.