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Grand Manan Island Weather in August
Thinking of visiting Grand Manan Island in August? Expect pleasant temperatures reaching 19°C (66°F) during the day, dropping to 14°C (57°F) at night, and note that quite a bit of rainfall is likely.
Rainfall in Grand Manan Island in August
Historically, approximately 11 days this month are expected to have rain, averaging 86 mm (3.4 in). Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in Grand Manan Island in August
In August, expect pleasant temperatures in Grand Manan Island, with highs of 19°C (66°F) and lows of 14°C (57°F) at night. August is typically considered a summer month. Even when the weather is stable, mornings and evenings can still feel distinctly cool. Nights cool down to 14°C (57°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions. On average, it is the month with the highest temperature of the year.If your ideal day consists of dry skies and pleasant temperatures, July and August typically offer the best circumstances for Grand Manan Island.
Grand Manan Island Temperature in August
Min Temperature
14°C (57°F)
Max Temperature
19°C (66°F)
Chance of Rain
37%
Precipitation
86 mm (3.4 in)
Rainy days
11 days
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.
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Grand Manan Island typically stay consistent throughout August, with daily highs averaging around 19°C (66°F). Nights are cool, with lows typically ranging from 11°C (52°F) to 14°C (57°F).
Average temperatures in August
Daily Historical Precipitation
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather records for Grand Manan Island in August
Browse day-by-day weather records for Grand Manan Island spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Grand Manan Island historical weather extremes in August
The extremes listed below come from historical weather data collected in Grand Manan Island from 2002 through 2026.
- The warmest day in August was on August 13, 2002, with a maximum of 34°C (93°F).
- Grand Manan Island experienced its chilliest August day on August 29, 2009, reaching only 12°C (54°F).
- Grand Manan Island registered its coldest August night on August 21, 2025, with temperatures dropping to 2°C (36°F).
Best Places in Canada in August
Find out more about the weather in Canada and which places have the best travel conditions in this month. See all of Canada in August →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Grand Manan Island in August
Pleasant temperatures in August mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes.
What To Do in Grand Manan Island in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling9/10 -
Walking9/10 -
Camping8/10 -
Outdoor sports9/10
Grand Manan Island 3-Day Forecast
More climate data for Grand Manan Island
See the full Grand Manan Island climate overview or explore weather in Canada.
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