In 349 days · Sat, Oct 9, 2027
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Saturday, October 9th, 2027
142 S Clinton Ave, Bay Shore NY
Half · 10K · 5K
59–68°F · some rain risk
See last 10 years
On this date: rain 3 of the last 10 years
2025
51–66°F
dry
2024
56–68°F
dry
2023
56–73°F
dry
2022
50–55°F
rain
2021
61–72°F
dry
2020
53–65°F
dry
2019
55–66°F
rain
2018
65–75°F
rain
2017
58–64°F
dry
2016
61–70°F
dry
Best months to race in New York →
Race-day forecast · Saturday, Oct 9
Cloudy · 59–70°F
Saturday, Oct 9starts near 59°F · 15% chance of rain · wind up to 13 mph
About this race
THE NORTHWELL HEALTH GREAT SOUTH BAY RUN - SATURDAY OCTOBER 9th, 2027.
Celebrate 42 years of running on Long Island at the Northwell Health Great South Bay Run!
Starting and finishing at beautiful Bay Shore Marina Park, this Long Island tradition offers three USATF-certified courses, giving runners of all abilities the chance to be part of an AWESOME race day.
- HALF MARATHON: 13.1 Miles
- 10K RUN: 6.2 Miles
- 5K FAMILY FUN RUN: 3.1 Miles
Each course takes runners through the heart of historic downtown Bay Shore, past beautiful residential neighborhoods, and alongside some of the area’s most scenic landmarks, including the Brightwaters Lakes, Cascades, and Canals.
Then get ready for an incredible finish back at Bay Shore Marina with sweeping, unobstructed views of Fire Island and the Great South Bay.
Whether you're chasing a Half Marathon PR, racing the 10K, running your first 5K, or enjoying the day with family and friends, the Great South Bay Run delivers an unforgettable Long Island race experience.
THREE DISTANCES. ONE GREAT RACE DAY.
Course map
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