In October, the weather in Carrick-on-Shannon is typically warm. Average daily high temperature in October is about 12 degrees above zero. On average, Carrick-on-Shannon has 24 rainy, 3 sunny, 2 cloudy, and 2 partly cloudy days in October. The rains are usually heavy. October as well as January, February, March, and April is considered the most uncomfortable time to visit Carrick-on-Shannon.