Mount Desert Island Marathon

Bar Harbor, ME, USA · October 18, 2026

49°·57° high·Breezy·Dry

Weather

Race Day Weather

49°at start

57° high

Breezy

Dry

Cool start, steady conditions

Runners will face a temperature trend from 46°F at the start to 57°F by the finish, with an average humidity of 71%. Winds will be from the SW at 11 mph, creating a slight challenge with gusts up to 18 mph. With comfortable temperatures, runners can maintain their pace but should stay hydrated throughout.

Race day forecast available in 151 days

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Distance: 26.2mi

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Race Info

The Mount Desert Island Marathon, Half & Relay is North America’s premier destination road race. The award-winning course features miles of pristine terrain passing tranquil lakes, soaring mountains, sleepy Maine villages, and stunning seaside vistas —including Somes Sound, the only fjord on the Eastern Seaboard— all set against the awe-inspiring backdrop of Acadia National Park in peak fall foliage season. The Marathon and Team Relay start in the world-famous Bar Harbor, while the Half-Marathon starts in picturesque village of Northeast Harbor. All three races finish on the quietside of MDI in the hardworking lobster fishing community of Southwest Harbor. Source

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Course Map

FAQ

When is the 2026 Mount Desert Island Marathon?

The 2026 Mount Desert Island Marathon will be held on Sunday October 18, 2026.

Is the Mount Desert Island Marathon a Boston Marathon Qualifier?

Yes, the Mount Desert Island Marathon is an official Boston Marathon qualifier.

What is the time limit for the Mount Desert Island Marathon?

The time limit for the Mount Desert Island Marathon is 6.5 hours.

What will the weather be like for the 2026 Mount Desert Island Marathon?

The forecast calls for a high of 57°F and a low of 45°F with a 0% chance of rain.

Historical Weather

Based on 22 years of data

Avg Temp

54°F

L:45° H:54°

RunScore

Conditions

Rain Freq

14%

3 of 22 yrs

Wind11mph

Dew38°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2025 Mount Desert Island Marathon Clear conditions throughout the day. 2025	41°/60°	-	47°
2024 Mount Desert Island Marathon Partly cloudy throughout the day. 2024	37°/70°	-	42°
2023 Mount Desert Island Marathon Becoming cloudy in the afternoon with late afternoon rain. 2023	49°/56°	-	42°
2022 Mount Desert Island Marathon Clearing in the afternoon. 2022	47°/62°	-	50°
2019 Mount Desert Island Marathon Clear conditions throughout the day. 2019	43°/53°	-	37°
2018 Mount Desert Island Marathon Partly cloudy throughout the day. 2018	42°/50°	-	34°
2017 Mount Desert Island Marathon Partly cloudy throughout the day. 2017	55°/62°	-	57°
2016 Mount Desert Island Marathon Partly cloudy throughout the day. 2016	51°/59°	-	50°
2015 Mount Desert Island Marathon Becoming cloudy in the afternoon. 2015	33°/40°	-	24°
2014 Mount Desert Island Marathon Partly cloudy throughout the day with early morning rain. 2014	45°/47°	-	38°
2013 Mount Desert Island Marathon Partly cloudy throughout the day with morning rain. 2013	54°/60°	-	48°
2012 Mount Desert Island Marathon Cloudy skies throughout the day with rain clearing later. 2012	44°/53°	Light	43°
2011 Mount Desert Island Marathon Partly cloudy throughout the day. 2011	55°/58°	-	39°
2010 Mount Desert Island Marathon Partly cloudy throughout the day. 2010	45°/56°	-	37°
2009 Mount Desert Island Marathon Partly cloudy throughout the day with rain. 2009	38°/43°	-	31°
2008 Mount Desert Island Marathon Clear conditions throughout the day. 2008	30°/48°	-	25°
2007 Mount Desert Island Marathon Partly cloudy throughout the day. 2007	43°/52°	-	39°
2006 Mount Desert Island Marathon Partly cloudy throughout the day. 2006	43°/54°	-	30°
2005 Mount Desert Island Marathon Partly cloudy throughout the day with a chance of rain throughout the day. 2005	48°/52°	Light	42°
2004 Mount Desert Island Marathon Partly cloudy throughout the day with morning rain. 2004	52°/57°	-	42°
2003 Mount Desert Island Marathon Partly cloudy throughout the day. 2003	40°/46°	-	27°
2002 Mount Desert Island Marathon Partly cloudy throughout the day with morning rain. 2002	46°/48°	Light	39°