Weather in Bar Harbor in June

A good month. June is a solid month to be in Bar Harbor. Highs average 18.5 °C, lows 11 °C, and rain falls on 14 days — nothing in the month is working against you.

June ranks 4 of 12 in Bar Harbor: past the worst of the year but short of August, which is the month to book if the dates are open.

Rain on 14 days, 4 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average June reaches 30 °C. Across the twenty years measured, the hottest June day reached 29.2 °C and the coldest night fell to 4.7 °C, and the wettest single day dropped 59 mm — roughly 53% of the month's rain in one day.

June is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest June on record still delivered 221 mm against 39 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 112 mm average is a reasonable planning figure, not a promise.

Wind is light at 4.5 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 85%, high enough to notice on the warm days without dominating them.

How June sits in the year

The month is on the way up: 4.4 °C warmer than May, and July adds another 3.6 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in June

June is at or near the longest days of Bar Harbor's year: 15.5 hours of daylight, holding steady all month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 10.1 °C in June — too cold to swim without a wetsuit. The sea peaks at 15.1 °C in August and bottoms out at 3.8 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

June in Bar Harbor versus nearby

If Bar Harbor is one option among several, the nearby comparison is worth making. Sherbrooke is close enough to be a coin toss — 3.5 °C warmer, 5 days more rain. Boston is close enough to be a coin toss — 5.4 °C warmer, 1 day less rain.

So: June works, with August the better month by 11 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Bar Harbor

See all twelve months in Bar Harbor, or where else to go in June.