Grand Manan Island Weather in September
September in Grand Manan Island brings moderate temperatures, with highs of 17°C (63°F) and nights dropping to 13°C (55°F). Rainfall is on the higher side this month, averaging around 115 mm (4.5 in), so keep a rain jacket handy.
Rainfall in Grand Manan Island in September
Rain is expected on roughly 11 days, totalling around 115 mm (4.5 in) for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in Grand Manan Island in September
Grand Manan Island in September gets highs of 17°C (63°F) during the day and drops to 13°C (55°F) at night. The summer season is characteristic of September. Conditions are often most pleasant around the middle of the day. Nights cool down to 13°C (55°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.For Grand Manan Island itself, July and August generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Canada, check out our Grand Manan Island's climate page.
Grand Manan Island Temperature in September
Min Temperature
13°C (55°F)
Max Temperature
17°C (63°F)
Chance of Rain
35%
Precipitation
115 mm (4.5 in)
Rainy days
11 days
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Grand Manan Island typically drop from around 21°C (70°F) at the start of September to approximately 17°C (63°F) by the end. Nights are cool, with lows typically ranging from 6°C (43°F) to 11°C (52°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Grand Manan Island in September
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 September
Based on 49 years of weather observations in Grand Manan Island between 1976 and 2025, these are the recorded extremes.
- The hottest September day on record in Grand Manan Island reached 33°C (91°F) (September 3, 1999).
- On September 27, 1980, Grand Manan Island saw its coldest September day with temperatures maxing out at 7°C (45°F).
- The coldest night in September in Grand Manan Island was on September 25, 1995, with a minimum of -3°C (27°F).
Best Places in Canada in September
Find out more about the weather in Canada and which places have the best travel conditions in this month. See all of Canada in September →
perfect weather
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What to Wear in Grand Manan Island in September
For Grand Manan Island in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho.What To Do in Grand Manan Island in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Canada, check out our Grand Manan Island's climate page.
See the full Grand Manan Island climate overview or explore weather in Canada.
