The 2026 Boston 5K has concluded.
Boston 5K
Race complete
Boston, MA, USA · April 18, 2026
Boston 5K race day weather
49°at start
50° high
Breezy
Light rain
Your goal
0:00:00
Cool temps, light rain expected
Runners will face a cool start with temperatures ranging from 48°F to 50°F. Light rain is anticipated throughout, with a steady wind from the NE at 15 mph. With high humidity at 96%, a conservative pacing strategy is advised to mitigate the effects of the moisture and wind.
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Distance: 3.1mi
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Boston 5K FAQ
When is the 2026 Boston 5K?
The 2026 Boston 5K will be held on Saturday April 18, 2026.
What is the time limit for the Boston 5K?
The time limit for the Boston 5K is 1 hours.
What will the weather be like for the 2026 Boston 5K?
The forecast calls for a high of 50°F and a low of 44°F with a 100% chance of rain.
What is the weather usually like for the Boston 5K?
Over the 4 years racecast.io has race-day weather for (2023 to 2026), it averaged 52°F at the start and 54°F by a typical finish. Rain fell during race hours in 1 of those years (2026).
What was the hottest Boston 5K?
Of the 4 years on record, 2025 was the warmest, reaching 62°F during race hours. The coldest start was 2026, at 49°F.
What was the windiest Boston 5K?
Of the 4 years on record, 2026 was the windiest, with wind averaging 14 mph during race hours. The calmest was 2023, at 10 mph.
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