Clarence DeMar Marathon

Keene, NH, USA · September 27, 2026

56°·71° high·Light·Dry

Weather

Race Day Weather

56°at start

72° high

Light

Dry

Warm afternoon, steady conditions

Runners will face a temperature rising from 56°F at the start to 72°F by the finish, with an average humidity of 73%. Winds will be light, coming from the WNW at 6 mph, creating a slight tailwind throughout. To optimize performance, runners should pace conservatively early on and stay hydrated as temperatures increase.

Race day forecast available in 78 days

5 AM

6 AM

7 AM

8 AM

9 AM

10 AM

11 AM

12 PM

1 PM

2 PM

3 PM

Pre-raceRace windowPost-race

Pace Calculator

Distance: 26.2mi

Target Finish Time

0:00:00

HH:MM:SS

Pace

—

Weather Adj.

—

Common Goals:

Get forecast alerts for Clarence DeMar Marathon

We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.

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.

Website

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

The forecast calls for a high of 70°F and a low of 53°F with a 14% chance of rain.

Historical Weather

Based on 17 years of data

Avg Temp

69°F

L:51° H:69°

RunScore

Conditions

Rain Freq

12%

2 of 17 yrs

Wind7mph

Dew52°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°/82°	-	61°
2024 Clarence DeMar Marathon Partly cloudy throughout the day. 2024	57°/66°	-	54°
2023 Clarence DeMar Marathon Cloudy skies throughout the day with rain. 2023	52°/63°	-	51°
2022 Clarence DeMar Marathon Partly cloudy throughout the day with late afternoon rain. 2022	40°/64°	-	47°
2021 Clarence DeMar Marathon Partly cloudy throughout the day. 2021	53°/68°	-	50°
2019 Clarence DeMar Marathon Clearing in the afternoon. 2019	61°/66°	-	47°
2018 Clarence DeMar Marathon Partly cloudy throughout the day with morning rain. 2018	42°/62°	Light	45°
2017 Clarence DeMar Marathon Clear conditions throughout the day. 2017	55°/92°	-	62°
2016 Clarence DeMar Marathon Clearing in the afternoon. 2016	36°/61°	-	36°
2015 Clarence DeMar Marathon Clearing in the afternoon. 2015	34°/66°	-	37°
2014 Clarence DeMar Marathon Clearing in the afternoon. 2014	54°/81°	-	52°
2013 Clarence DeMar Marathon Partly cloudy throughout the day. 2013	44°/69°	-	45°
2012 Clarence DeMar Marathon Partly cloudy throughout the day with late afternoon rain. 2012	54°/59°	-	51°
2011 Clarence DeMar Marathon Partly cloudy throughout the day. 2011	64°/75°	-	64°
2010 Clarence DeMar Marathon Partly cloudy throughout the day. 2010	49°/70°	-	48°
2009 Clarence DeMar Marathon Cloudy skies throughout the day with a chance of rain throughout the day. 2009	50°/63°	Light	54°
2008 Clarence DeMar Marathon Cloudy skies throughout the day with rain. 2008	63°/72°	-	62°

More NH Races

New Hampshire Marathon

2026-10-03 · Bristol, NH, USA

Manchester City Marathon

2026-11-08 · Manchester, NH, USA

Cheap Marathon

2027-04-03 · Derry, NH, USA

Free guidesMarathon Fueling Guide·Carb Loading Guide·Race Morning Guide·Race Day Gear Guide·Pacing Strategy Guide·Mental Strategy Guide