In March, the weather in Invercargill is typically warm. Average daily high temperature in March is about 15 degrees above zero. On average, Invercargill has 21 rainy, 4 cloudy, 3 sunny, and 3 partly cloudy days in March. The rains are usually heavy. March as well as January, April, May, and June is considered the most uncomfortable time to visit Invercargill.