Weather is probably a major factor when you plan your trip to Campobello Island, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July, with an average temperature of 16°C, while the coldest months are January and February, with an average of -2°C. The snowiest months in Campobello Island are January, February, December and March, with each month seeing an average of 39 cm of snowfall.