October in Invercargill is the rainiest month of the year. In October, the weather in Invercargill is typically warm. Average daily high temperature in October is about 14 degrees above zero. On average, Invercargill has 20 rainy, 8 partly cloudy, and 3 sunny days in October. The rains are usually heavy. October as well as March, April, May, and June is considered the most uncomfortable time to visit Invercargill.