Bar Harbor (Acadia) weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Excellent
Best time to visit: June – September
What is the weather like in Bar Harbor (Acadia) in August?
In August, Bar Harbor (Acadia) is mild: daytime highs average 20 °C, and nights cool down to about 16 °C. The sea averages 13.1 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain falls on about 8 days, adding up to 75 mm. All in all, August is an excellent month for a holiday in Bar Harbor (Acadia).
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 83 | 84 | 83 |
| Day | 20° | 20° | 18° |
| Night | 16° | 16° | 14° |
| Sea | 12° | 13° | 13° |
| Sun | 7 h | 7 h | 6 h |
| Rain days | 10 | 8 | 8 |
More details for August
- Daylight
- 14 h 6 min05:35 – 19:40
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 2 daysdew point 18 °C or moreAll months
- Wind
- 18 km/haverage daily peakAll months
- Cloud cover
- 58 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %68 %
- Few rainy daysweight 30 %69 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Nature escape”.
What to pack in August
- Sunscreen
- Sunglasses & sun hat
- Rain jacket or umbrella
Bar Harbor (Acadia) in August: quick answers
Is Bar Harbor (Acadia) hot in August?
No. In August, Bar Harbor (Acadia) is mild: daytime highs average 20 °C and nights drop to about 16 °C.
Can you swim in Bar Harbor (Acadia) in August?
Only if you don't mind cold water: in August the sea averages just 13.1 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Bar Harbor (Acadia) in August?
Rain falls on about 8 days, adding up to 75 mm.
Bar Harbor (Acadia) month by month
The whole year in Bar Harbor (Acadia)All destinations: USAWhere to go in AugustSea temperature in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences