In October, the weather in Ostashkovo is typically cold. Average daily high temperature in October is about 4 degrees above zero. On average, Ostashkovo has 17 cloudy, 5 rainy, 4 sunny, 4 partly cloudy, and 1 snowy day in October. The rains are usually light. October as well as January, February, and December is considered the most uncomfortable time to visit Ostashkovo.