Grand Manan Island (NB) Temperature by Month
Grand Manan Island in New Brunswick, Canada sees significant seasonal temperature differences, with daytime highs between 2°C (36°F) in January and 19°C (66°F) in August, averaging 10°C (50°F) annually. Explore the full monthly breakdown below.
Grand Manan Island Monthly Temperatures
Visitors to Grand Manan Island will encounter a climate influenced by big temperature differences across the year. Nighttime temperatures range from 14°C (57°F) in August to -6°C (21°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Grand Manan Island by month:
The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest.
The chart below shows the average temperature throughout the year:
Daily Historical Temperatures
50-year average (1976-2025)
Average high and low temperatures for each day of the month based on long-term records.
Average temperatures in July
Historical Grand Manan Island Temperatures: 1976-2026
Browse day-by-day temperature records for Grand Manan Island spanning 51 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: Grand Manan Island vs Canada
The map below shows the annual temperature across Canada. You can also select individual months if you want to compare a specific time of year.
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Grand Manan Island vs World: Temperature Compared
Grand Manan Island's average annual maximum temperature is 10°C (50°F). To put that in context, here's how it compares to a few well-known destinations:
Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.
On the cooler end, Oslo, Norway averages just 10°C (50°F) annually, with pleasant summers but long, cold winters.
Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.
Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.
Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.
For more on Grand Manan Island's weather — including monthly rainfall, sunshine hours, and humidity — visit our Grand Manan Island climate page.
