Runners will face steady temperatures from 57°F to 59°F throughout the race, with high humidity at 95%. A headwind from the NE at 16 mph will require runners to adjust their pacing strategy. Maintaining hydration will be crucial, especially with the humidity, while gear choices should prioritize comfort.

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Distance: 26.2mi

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Race Info

The Clarence DeMar Marathon offers a scenic 26.2-mile journey through New Hampshire's picturesque countryside, featuring gentle rolling hills and a net elevation drop that makes it a prime Boston Marathon qualifier. Runners are treated to stunning views of early autumn foliage, with the course culminating at the historic Appian Way of Keene State College, near where marathon legend Clarence DeMar once coached collegiate runners. The event is renowned for its exceptional organization and the enthusiastic support of over 300 volunteers, creating a welcoming atmosphere for participants of all levels.

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Race weekend

Sunday, September 27

7:00 AMMarathon (26.2 mi)

8:00 AMHalf Marathon (13.1 mi)

Course Map

FAQ

When is the 2026 Clarence DeMar Marathon?

The 2026 Clarence DeMar Marathon will be held on Sunday September 27, 2026.

Is the Clarence DeMar Marathon a Boston Marathon Qualifier?

Yes, the Clarence DeMar Marathon is an official Boston Marathon qualifier.

What is the time limit for the Clarence DeMar Marathon?

The time limit for the Clarence DeMar Marathon is 7 hours.

What will the weather be like for the 2026 Clarence DeMar Marathon?

The forecast calls for a high of 59°F and a low of 56°F with a 0% chance of rain.

Historical Weather

Based on 17 years of data

Avg Temp

55°F

L:51° H:62°

RunScore

Conditions

Rain Freq

12%

2 of 17 yrs

Wind2mph

Dew50°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2025 Clarence DeMar Marathon Clear conditions throughout the day. 2025	57°/70°	-	60°
2024 Clarence DeMar Marathon Partly cloudy throughout the day. 2024	57°/62°	-	54°
2023 Clarence DeMar Marathon Cloudy skies throughout the day with rain. 2023	52°/58°	-	50°
2022 Clarence DeMar Marathon Partly cloudy throughout the day with late afternoon rain. 2022	40°/55°	-	44°
2021 Clarence DeMar Marathon Partly cloudy throughout the day. 2021	53°/66°	-	53°
2019 Clarence DeMar Marathon Clearing in the afternoon. 2019	61°/64°	-	50°
2018 Clarence DeMar Marathon Partly cloudy throughout the day with morning rain. 2018	42°/53°	Light	45°
2017 Clarence DeMar Marathon Clear conditions throughout the day. 2017	55°/80°	-	60°
2016 Clarence DeMar Marathon Clearing in the afternoon. 2016	36°/54°	-	38°
2015 Clarence DeMar Marathon Clearing in the afternoon. 2015	34°/54°	-	35°
2014 Clarence DeMar Marathon Clearing in the afternoon. 2014	54°/66°	-	49°
2013 Clarence DeMar Marathon Partly cloudy throughout the day. 2013	44°/59°	-	43°
2012 Clarence DeMar Marathon Partly cloudy throughout the day with late afternoon rain. 2012	54°/55°	-	52°
2011 Clarence DeMar Marathon Partly cloudy throughout the day. 2011	64°/69°	-	64°
2010 Clarence DeMar Marathon Partly cloudy throughout the day. 2010	49°/65°	-	47°
2009 Clarence DeMar Marathon Cloudy skies throughout the day with a chance of rain throughout the day. 2009	50°/57°	Light	51°
2008 Clarence DeMar Marathon Cloudy skies throughout the day with rain. 2008	63°/68°	-	62°