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. However, this rain/snowfall is not evenly distributed, the city has pleasant summers and very cold winters. 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
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: July and August
- Warmest weather: July and August
- Seasonal pattern: Pleasant summers and very cold winters
- Coldest conditions: January, with freezing nights around -6°C (21°F).
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. Grand Manan Island has pleasant summers and very cold winters.
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 on the map
Grand Manan Island is highlighted - select any city to see its climate.
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