Climate Insights for Bar Harbor

The climate in Bar Harbor is cool. The average annual temperature is 7°C and approximately 1315mm of precipitation falls per year. Bar Harbor receives a notable amount of rainfall throughout the year, including during its driest month. Bar Harbor is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are January, February, December, when temperatures can drop to -3°C. Snowfall occurs from January to December, with around 177cm accumulating over the season.

Bar Harbor sees moderate temperature variation throughout the year, ranging from -3°C to 17°C. August is the warmest month, though highs remain moderate at 17°C with a mean of 16°C. The coldest month is January, when overnight lows fall to -3°C and the daily average is -1°C. Daily temperature variation is modest, with an average difference of 3°C between highs and lows. The sharpest temperature change occurs between November and December, with a 5°C shift in average temperatures.

Bar Harbor is a fairly wet location, receiving approximately 1315mm of precipitation annually, which averages out to around 110mm per month. The wettest month is December, averaging 165mm of rainfall. January and April also tend to see above-average precipitation. The driest month is July, with just 50mm. That's 114mm less than December, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Snowfall is a regular feature from January to December, with around 177cm accumulating over the season. February typically sees the most snow at around 52cm.

Bar Harbor is relatively calm, with an average annual wind speed of 7km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 9km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 5km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 4km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 8km/h in winter, 7km/h in spring, 5km/h in summer, 7km/h in autumn.

It is currently spring in Bar Harbor, which began on March 20, 2026. Bar Harbor is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 17°C, while the coldest stretch bottoms out in January near -3°C. Summer is next, beginning on June 21, 2026 — 2 days from now.

The best time to visit Bar Harbor is during August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 79mm per month. By contrast, January can be quite cold with temperatures dropping to -3°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Bar Harbor based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.