Grand Manan Island (NB) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Grand Manan Island.
Climate overview of Grand Manan Island
The climate in Grand Manan Island, New Brunswick, Canada, is marked by large temperature swings across the seasons, ranging from 19°C (66°F) in August to 2°C (36°F) in January.
With around 1403 mm (55 in) of annual rain/snowfall, Grand Manan Island has a notably wet climate. The wettest month is December.
Grand Manan Island Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Grand Manan Island — and find the best time to visit.
Monthly Temperature in Grand Manan Island
In Grand Manan Island, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a pleasant 19°C (66°F) in August. In January, the coolest month of the year, temperatures drop to a very cold 2°C (36°F).
At night, temperatures range from around 14°C (57°F) in August to -6°C (21°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Grand Manan Island
Grand Manan Island experiences significant rain/snowfall throughout the year, averaging 1403 mm (55 in) of precipitation annually. Grand Manan Island experiences moderate seasonal variation in snow/rainfall, with monthly averages ranging from 150 mm (5.9 in) in December, the wettest month, and 85 mm (3.3 in) in July, the driest month. For more details, please visit our Grand Manan Island Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Grand Manan Island
Frequently asked questions about the climate in Grand Manan Island
What is the best time to visit Grand Manan Island?
July and August typically offer the most optimal weather in Grand Manan Island. In contrast, January, February, March, April, May, October, November and December tend to have less optimal conditions.
What temperatures can I expect in Grand Manan Island?
Daytime highs range from 2°C (36°F) in January to 19°C (66°F) in August. Nighttime lows range from -6°C (21°F) to 14°C (57°F). Temperatures vary considerably through the year.
How much rain does Grand Manan Island get?
Annual rainfall is around 1403 mm (55 in). December is the wettest month with 150 mm (5.9 in), while July is the driest with 85 mm (3.3 in). In the coldest months, precipitation may fall as snow/rain.
Grand Manan Island 3-Day Forecast
Grand Manan Island (NB) 3-Day Forecast
Grand Manan Island on the map
Grand Manan Island is highlighted — select any city to see its climate.
Popular this month
Where to go in June — average daytime high across popular destinations.
Montréal
25°C (77°F) Niagara Falls
25°C (77°F) Ottawa25°C (77°F) Quebec City
23°C (73°F) Toronto22°C (72°F) Calgary20°C (68°F) Vancouver19°C (66°F) Whistler15°C (59°F) 
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
The 5 most beautiful lakes in Canada
Explore Canada's stunning lakes: Lake Louise, Lake Superior, Maligne Lake, Emerald Lake, and Lake Okanagan, each offering unique beauty and activities.
Canoeing the south Nahannii
The South Nahanni in the northwest of Canada is one of the most impressive wilderness rivers in the world. Canoeing the south Nahanni is something you must add to your bucket list.
See Polar Bears in Churchill Canada
Thousands of bears gather at the small town of Churchill. In the evening the northern lights give a light show against the dark evening sky. An unforgettable experience.
Banff National Park
Snowy mountains, clear blue lakes and green forests make Banff National Park a wonderful bucket list destination. The pristine wilderness is a mecca for walkers.