There's no topic like the weather to get and keep people talking in Cape Breton. The weather varies greatly across the breadth of the island, and there dozens of 'microclimates'. You can be driving off the Causeway in blistering heat, and find yourself lost in an Isle Madame fog. In Margaree Valley it will be hot and still, while at the coast, at the same moment, there will be lovely cooling breezes coming from the ocean. Although it's hard to generalize about the weather here, it is safe to say that spring comes later and fall earlier. The summer months can be hot, but luckily there's not very much humidity.
Spring- April - June: It can still be chilly in the evenings until the second half of June. Bring clothes which can be layered to accommodate swings in temperature. The second half of June can be hot during the day, but a bit cooler close the ocean.
Summer - July - August: It can be hot during the summer, but not humid. Summer wear is recommended but also clothes which could be worn in a cooler environment, like that which exists in the Cape Breton Highlands National Park, parts of which are at higher altitude.
Fall - September - October: By September, evenings can be chilly, even though days are warm. October is fall here, so you should bring fall clothing which can be layered if necessary.
Winter - November - March: Winter weather can vary in its severity; there are some areas which get a lot of snow, and some where there is less. Winds on the west side of the island can at times push the temperature down to -40 degrees C, but generally speaking, winter weather is similar to other areas on the northeastern seaboard.

Visit the Environment Canada website for complete local weather information:
Northeast Margaree/ Margaree Valley
Grand Etang (coast)


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