Mount Desert Island Half Marathon

Bar Harbor, ME, USA · October 18, 2026·
partly-cloudy-day51°·52° high·Windy·Dry
9
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Race Day Weather

partly-cloudy-day
51°at start
53° high
Windy
Dry

Comfortable temps, moderate wind

Mild 51°F temps at gun time mean comfortable early miles without overheating risk. Moderate winds around 16mph may affect pacing on open sections of the course. Moderate humidity at 74% is worth noting for effort level, especially in later miles.

Race day forecast available in 14 days
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Distance: 13.1mi
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Race Plan

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Race Info

The Mount Desert Island Half Marathon starts at the marathon's halfway point in the village of Northeast Harbor and finishes alongside the marathon in Southwest Harbor. The route runs along Somes Sound, the only true fjord on the Eastern Seaboard, climbs to the interior end of the fjord near mile 5, then rises gradually through the village of Somesville before a downhill final mile to the finish. It follows the USATF-certified back half of the marathon course.

Race weekend

Sunday, October 18
8:00 AMMarathon (26.2 mi)
8:00 AMMarathon Relay (26.2 mi)
8:30 AMHalf Marathon (13.1 mi)

FAQ

When is the 2026 Mount Desert Island Half Marathon?

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

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

The time limit for the Mount Desert Island Half Marathon is 4 hours.

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

The forecast calls for a high of 55°F and a low of 51°F with a 11% chance of rain. Check our detailed hourly forecast above for the best half marathon race plan.

Historical Weather

Based on 22 years of data
Avg Temp
49°F
L:47° H:52°
RunScore
9
Conditions
Rain Freq
9%
2 of 22 yrs
Wind9mph
Dew40°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2025
clear-day
47°/56°-
9
2024
clear-day
46°/65°-
8
2023
clear-day
49°/55°-
9
2022
cloudy
49°/57°-
8
2019
clear-day
44°/50°-
10
2018
clear-day
44°/47°-
9
2017
partly-cloudy-day
58°/62°-
6
2016
cloudy
53°/57°-
8
2015
clear-day
34°/38°-
9
2014
cloudy
45°/46°-
8
2013
cloudy
57°/60°-
7
2012
rain
45°/52°Light
10
2011
clear-day
55°/56°-
9
2010
clear-day
47°/53°-
9
2009
clear-day
38°/42°-
9
2008
clear-day
34°/47°-
9
2007
partly-cloudy-day
45°/50°-
10
2006
clear-day
47°/52°-
10
2005
rain
48°/52°Light
9
2004
partly-cloudy-day
53°/55°-
9
2003
partly-cloudy-day
40°/46°-
10
2002
partly-cloudy-day
46°/48°-
10