SeasonMapBar Harbor weather in August
United States
August in Bar Harbor: nice, rainy, with clean air — one of the best months to visit.
#2 of 12 months in Bar Harbor · #314 of 1383 destinations to visit in August · comfort 88/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Bar Harbor in August
Bar Harbor's forum calls August warm and sunny by day, mid-to-high 70s°F, cooling into the 60s at night — genuinely pleasant, which is exactly why it's the busiest month of the year here. Regulars' standard packing list covers both shorts and a light jacket for cooler evenings, plus a rain layer just in case, and note the ocean itself stays cold, 55-60°F, even at the height of summer.
Add your own note from Bar Harbor's card on the map.
Bar Harbor climate normals — August
| Daytime high | 22°C / 72°F | 😎 nice |
|---|---|---|
| Nighttime low | 14°C / 58°F | |
| Feels like (high) | 23°C / 73°F | |
| Sea temperature | 18°C / 64°F | 🧊 bracing |
| Rainfall | 91 mm / 3.6 in | 🌧 rainy |
| Rainy days | 9 days | |
| Humidity | 83% | 💦 very humid |
| Dew point | 15°C / 60°F | |
| Sunshine | 10.3 h/day | |
| Daylight | 14 h | |
| Wind | 17 km/h / 11 mph | |
| Air quality (US AQI) | 37 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Bar Harbor in August
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdstravelers describe it as peak season, Cruise ship season, Peak summer season
Sourced from traveler notes: “…t night — genuinely pleasant, which is exactly why it's the busiest month of the year here. Regulars' standard packing list covers bo…” — Tripadvisor community
Peak crowdsBusyShoulder seasonQuiet
Best months for Bar Harbor's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Best weatherBar Harbor's weather peaks June–August, best around July.
August includes Lobster season.
Best weatherFair weatherToughest weather
What's on in Bar Harbor in August
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Cruise ship season
1 May – 31 OctCruise seasonCrowdedShips tender into the harbour from May, and the heaviest calls land in September and October with the leaf cruises. The town's thousand-passenger daily cap survived court only for July and August, so the autumn days are the crowded ones. Source ↗
- Opening
The CAT ferry to Nova Scotia
14 May – 14 Oct · usuallySummer season opensBook earlyThe fast ferry to Yarmouth runs from mid-May to mid-October and takes three and a half hours across the Gulf of Maine. Outside those dates the only way to Nova Scotia is a very long drive. Source ↗
- Nature
Lobster season
15 Jun – 15 Dec · usuallyForaging seasonMost of the Maine catch comes ashore between the summer shed and the end of autumn, and prices at the pounds follow the boats. Late summer soft-shell lobster is cheaper and sweeter than the hard-shell you get flown out of state.
- Season
Peak summer season
1 Jul – 31 AugSchool holidaysCrowdedBook earlyA town of five thousand hosting several million park visitors a year does most of it now. Rooms are booked months out, and the Island Explorer bus is quicker than looking for a parking space downtown.
Nearby, and something's on
Within 300 km of Bar Harbor — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Bar Harbor?
Bar Harbor in August — FAQ
- Is August a good time to visit Bar Harbor?
- August in Bar Harbor: nice, rainy, with clean air — one of the best months to visit. It ranks #2 of 12 months for Bar Harbor on SeasonMap's comfort score (88/100).
- What is the weather like in Bar Harbor in August?
- In August, Bar Harbor averages a daily high of 22°C and a low of 14.3°C, with about 91.3 mm of rain over roughly 8.8 rainy days.
- What is the air quality in Bar Harbor in August?
- Bar Harbor has a mean US Air Quality Index of about 37 in August.
Other months in Bar Harbor
Compare Bar Harbor in August
Warmer or cooler than Bar Harbor in August
Similar destinations in North America — August
Within 300 km: Acadia National Park's Acadia Night Sky Festival on 27–31 Aug.