Harpoon 5 Miler

Boston, MA, USA · May 15, 2027

59°·61° high·Breezy·Dry

Weather

Harpoon 5 Miler race day weather

59°at start

63° high

Breezy

Dry

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Mild start, slight humidity concern

Runners will face temperatures starting at 59°F and peaking at 61°F. With humidity averaging 67% and a light SSW wind at 9 mph, pacing should be conservative, especially early on. The slight chance of rain means no significant gear adjustments are necessary, but staying hydrated is essential.

Race day forecast available in 168 days

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Distance: 5.0mi

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About the Harpoon 5 Miler

The Harpoon 5-Miler is a five-mile road race in Boston's Seaport District that starts and finishes at Harpoon Brewery on Northern Avenue. The out-and-back course is flat and fast, with about 32 feet of elevation gain, and is run on the Saturday or Sunday in mid-May. The race benefits ALS research through The Angel Fund for ALS Research and the Peter Frates Family Foundation, and has raised more than $3.1 million. Runners finish with a post-race party at the brewery.

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Course Map

Harpoon 5 Miler FAQ

When is the 2027 Harpoon 5 Miler?

The 2027 Harpoon 5 Miler will be held on Saturday May 15, 2027.

What is the time limit for the Harpoon 5 Miler?

The time limit for the Harpoon 5 Miler is 1 hours.

What will the weather be like for the 2027 Harpoon 5 Miler?

The forecast calls for a high of 62°F and a low of 51°F with a 13% chance of rain.

What is the elevation gain of the Harpoon 5 Miler?

The Harpoon 5 Miler course has about 32 ft (10 m) of climbing.

What is the weather usually like for the Harpoon 5 Miler?

Over the 23 years racecast.io has race-day weather for (2002 to 2026), it averaged 63°F at the start and 64°F by a typical finish. Rain fell during race hours in 2 of those years (2006 and 2024).

What was the hottest Harpoon 5 Miler?

Of the 23 years on record, 2002 was the warmest, reaching 75°F during race hours. The coldest start was 2011, at 51°F.

What was the windiest Harpoon 5 Miler?

Of the 23 years on record, 2019 was the windiest, with wind averaging 17 mph during race hours. The calmest was 2008, at 3 mph.

Harpoon 5 Miler weather history

Based on 23 years of data

Avg Temp

64°F

L:63° H:64°

RunScore

Conditions

Rain Freq

2 of 23 yrs

Wind10mph

Dew53°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2026 Harpoon 5 Miler Partly cloudy throughout the day. 2026	65°/69°	-	50°
2025 Harpoon 5 Miler Partly cloudy throughout the day. 2025	66°/68°	-	49°
2024 Harpoon 5 Miler Cloudy skies throughout the day with a chance of rain throughout the day. 2024	54°/54°	Light	53°
2023 Harpoon 5 Miler Clearing in the afternoon with early morning rain. 2023	63°/65°	-	48°
2022 Harpoon 5 Miler Partly cloudy throughout the day with afternoon rain. 2022	67°/69°	-	59°
2019 Harpoon 5 Miler Partly cloudy throughout the day with afternoon rain. 2019	63°/64°	-	47°
2018 Harpoon 5 Miler Partly cloudy throughout the day with rain. 2018	71°/73°	-	66°
2017 Harpoon 5 Miler Partly cloudy throughout the day. 2017	57°/58°	-	43°
2016 Harpoon 5 Miler Partly cloudy throughout the day. 2016	57°/58°	-	53°
2015 Harpoon 5 Miler Partly cloudy throughout the day. 2015	62°/63°	-	57°
2014 Harpoon 5 Miler Partly cloudy throughout the day. 2014	62°/62°	-	45°
2013 Harpoon 5 Miler Partly cloudy throughout the day with late afternoon rain. 2013	59°/61°	-	51°
2012 Harpoon 5 Miler Partly cloudy throughout the day. 2012	65°/68°	-	48°
2011 Harpoon 5 Miler Cloudy skies throughout the day. 2011	51°/52°	-	46°
2010 Harpoon 5 Miler Partly cloudy throughout the day with rain clearing later. 2010	72°/74°	-	67°
2009 Harpoon 5 Miler Partly cloudy throughout the day. 2009	58°/59°	-	53°
2008 Harpoon 5 Miler Partly cloudy throughout the day with late afternoon rain. 2008	69°/71°	-	61°
2007 Harpoon 5 Miler Cloudy skies throughout the day with afternoon rain. 2007	59°/60°	-	55°
2006 Harpoon 5 Miler Cloudy skies throughout the day with a chance of rain throughout the day. 2006	56°/56°	Moderate	54°
2005 Harpoon 5 Miler Clearing in the afternoon. 2005	70°/71°	-	58°
2004 Harpoon 5 Miler Partly cloudy throughout the day. 2004	61°/62°	-	45°
2003 Harpoon 5 Miler Partly cloudy throughout the day with late afternoon rain. 2003	65°/66°	-	53°
2002 Harpoon 5 Miler Partly cloudy throughout the day with morning rain. 2002	73°/75°	-	50°