Historical Race Day Weather for the Boston Marathon

April 20, 2026

Race day snapshot

Partially cloudy

Start Line Conditions

Start Temp 43°F 6°C

Start Humidity 56% Humidity

Wind W 11 mph Wind

Race day high 55°F 13°C

Race day low 38°F 3°C

PR Score 99.62 Normal score 99.21

Course Score 99.62 Course-only Score

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April 21, 2025

Race day snapshot

Partially cloudy

Start Line Conditions

Start Temp 48°F 9°C

Start Humidity 35% Humidity

Wind ESE 5 mph Wind

Race day high 55°F 13°C

Race day low 43°F 6°C

PR Score 99.62 Normal score 99.21

Course Score 99.62 Course-only Score

April 15, 2024

Race day snapshot

Partially cloudy

Start Line Conditions

Start Temp 56°F 13°C

Start Humidity 72% Humidity

Wind ESE 5 mph Wind

Race day high 67°F 19°C

Race day low 46°F 8°C

PR Score 98.92 Normal score 99.21

Course Score 99.62 Course-only Score

April 17, 2023

Race day snapshot

Overcast

Start Line Conditions

Start Temp 48°F 9°C

Start Humidity 99% Humidity

Wind ENE 9 mph Wind

Race day high 56°F 13°C

Race day low 47°F 8°C

PR Score 99.50 Normal score 99.21

Course Score 99.62 Course-only Score

April 18, 2022

Race day snapshot

Sunny

Start Line Conditions

Start Temp 46°F 8°C

Start Humidity 43% Humidity

Wind NE 6 mph Wind

Race day high 54°F 12°C

Race day low 37°F 3°C

PR Score 99.62 Normal score 99.21

Course Score 99.62 Course-only Score

October 11, 2021

Race day snapshot

Partly Cloudy

Start Line Conditions

Start Temp 60°F 16°C

Start Humidity 88% Humidity

Wind NE 6 mph Wind

Race day high 69°F 21°C

Race day low 62°F 17°C

PR Score 96.71 Normal score 99.21

Course Score 99.62 Course-only Score

Live Forecast Tool

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Use the weather tracker to see how temperatures, headwinds, and tailwinds could change across the course based on your goal time and start setup.

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April 15, 2019

Race day snapshot

Overcast

Start Line Conditions

Start Temp 58°F 14°C

Start Humidity 87% Humidity

Wind SSE 5 mph Wind

Race day high 68°F 20°C

Race day low 46°F 8°C

PR Score 97.71 Normal score 99.21

Course Score 99.62 Course-only Score

April 16, 2018

Race day snapshot

Rain

Start Line Conditions

Start Temp 43°F 6°C

Start Humidity 89% Humidity

Wind NE 14 mph Wind

Race day high 50°F 10°C

Race day low 35°F 2°C

PR Score 99.62 Normal score 99.21

Course Score 99.62 Course-only Score

April 17, 2017

Race day snapshot

Clear

Start Line Conditions

Start Temp 72°F 22°C

Start Humidity 37% Humidity

Wind WNW 17 mph Wind

Race day high 71°F 22°C

Race day low 42°F 6°C

PR Score 99.02 Normal score 99.21

Course Score 99.62 Course-only Score

April 18, 2016

Race day snapshot

Mostly Clear

Start Line Conditions

Start Temp 67°F 19°C

Start Humidity 28% Humidity

Wind ENE 8 mph Wind

Race day high 71°F 22°C

Race day low 48°F 9°C

PR Score 99.21 Normal score 99.21

Course Score 99.62 Course-only Score

April 20, 2015

Race day snapshot

Light Rain

Start Line Conditions

Start Temp 41°F 5°C

Start Humidity 93% Humidity

Wind E 12 mph Wind

Race day high 44°F 7°C

Race day low 40°F 4°C

PR Score 99.62 Normal score 99.21

Course Score 99.62 Course-only Score

April 21, 2014

Race day snapshot

Clear

Start Line Conditions

Start Temp 50°F 10°C

Start Humidity 24% Humidity

Wind WSW 10 mph Wind

Race day high 63°F 17°C

Race day low 36°F 2°C

PR Score 99.62 Normal score 99.21

Course Score 99.62 Course-only Score

April 15, 2013

Race day snapshot

Mostly Cloudy

Start Line Conditions

Start Temp 48°F 9°C

Start Humidity 48% Humidity

Wind N 3 mph Wind

Race day high 55°F 13°C

Race day low 37°F 3°C

PR Score 99.62 Normal score 99.21

Course Score 99.62 Course-only Score

April 16, 2012

Race day snapshot

Clear

Start Line Conditions

Start Temp 76°F 24°C

Start Humidity 46% Humidity

Wind SW 9 mph Wind

Race day high 91°F 33°C

Race day low 54°F 12°C

PR Score 96.80 Normal score 99.21

Course Score 99.62 Course-only Score

April 18, 2011

Race day snapshot

Partly Cloudy

Start Line Conditions

Start Temp 44°F 7°C

Start Humidity 43% Humidity

Wind W 20 mph Wind

Race day high 61°F 16°C

Race day low 44°F 7°C

PR Score 99.62 Normal score 99.21

Course Score 99.62 Course-only Score

April 19, 2010

Race day snapshot

Partly Cloudy

Start Line Conditions

Start Temp 47°F 8°C

Start Humidity 50% Humidity

Wind NNW 12 mph Wind

Race day high 60°F 16°C

Race day low 34°F 1°C

PR Score 99.62 Normal score 99.21

Course Score 99.62 Course-only Score

2009

Race day snapshot

Clear

Start Line Conditions

Start Temp 41°F 5°C

Start Humidity 70% Humidity

Wind ESE 9 mph Wind

Race day high 53°F 12°C

Race day low 28°F -2°C

PR Score 99.62 Normal score 99.21

Course Score 99.62 Course-only Score

2008

Race day snapshot

Overcast

Start Line Conditions

Start Temp 47°F 8°C

Start Humidity 83% Humidity

Wind E 3 mph Wind

Race day high 64°F 18°C

Race day low 42°F 6°C

PR Score 99.40 Normal score 99.21

Course Score 99.62 Course-only Score

2007

Race day snapshot

Overcast

Start Line Conditions

Start Temp 46°F 8°C

Start Humidity 87% Humidity

Wind ESE 14 mph Wind

Race day high 51°F 11°C

Race day low 38°F 3°C

PR Score 99.62 Normal score 99.21

Course Score 99.62 Course-only Score

2006

Race day snapshot

Overcast

Start Line Conditions

Start Temp 50°F 10°C

Start Humidity 50% Humidity

Wind N 8 mph Wind

Race day high 61°F 16°C

Race day low 33°F 1°C

PR Score 99.62 Normal score 99.21

Course Score 99.62 Course-only Score

2005

Race day snapshot

Partly Cloudy

Start Line Conditions

Start Temp 64°F 18°C

Start Humidity 11% Humidity

Wind NNE 6 mph Wind

Race day high 73°F 23°C

Race day low 37°F 3°C

PR Score 99.62 Normal score 99.21

Course Score 99.62 Course-only Score

2004

Race day snapshot

Clear

Start Line Conditions

Start Temp 77°F 25°C

Start Humidity 32% Humidity

Wind SW 18 mph Wind

Race day high 84°F 29°C

Race day low 46°F 8°C

PR Score 97.01 Normal score 99.21

Course Score 99.62 Course-only Score

2003

Race day snapshot

Clear

Start Line Conditions

Start Temp 60°F 16°C

Start Humidity 35% Humidity

Wind SE 10 mph Wind

Race day high 69°F 21°C

Race day low 32°F 0°C

PR Score 99.17 Normal score 99.21

Course Score 99.62 Course-only Score

2002

Race day snapshot

Fog

Start Line Conditions

Start Temp 51°F 11°C

Start Humidity 100% Humidity

Wind NNE 6 mph Wind

Race day high 66°F 19°C

Race day low 46°F 8°C

PR Score 98.41 Normal score 99.21

Course Score 99.62 Course-only Score

2001

Race day snapshot

Clear

Start Line Conditions

Start Temp 48°F 9°C

Start Humidity 32% Humidity

Wind NE 0 mph Wind

Race day high 57°F 14°C

Race day low 35°F 2°C

PR Score 99.62 Normal score 99.21

Course Score 99.62 Course-only Score

2000

Race day snapshot

Overcast

Start Line Conditions

Start Temp 43°F 6°C

Start Humidity 47% Humidity

Wind ENE 0 mph Wind

Race day high 48°F 9°C

Race day low 39°F 4°C

PR Score 99.62 Normal score 99.21

Course Score 99.62 Course-only Score