Race-day weather · Wyndo for runners
Brooklyn Half weather
May 15, 2027 · Brooklyn, NY · traditional start around 7:00 AM (America/New_York) — not yet confirmed for 2027. What the start usually feels like, year by year — and a live start-time read once the race confirms its schedule and race week arrives.
Countdown
260 days to race day
The live race-day forecast unlocks 254 days from now, when May 15, 2027 enters the 7-day forecast window. Until then, live hourly data is not available; the history below shows what race morning usually looks like.
The 2027 schedule hasn't been published yet — both the date and start time shown here are carried from earlier editions and aggregators. We'll switch on the live start-time read when the race posts its schedule.
Typical start temp
58°F
median of 20 years
A warm year
60°F
75th percentile start temp
Rain at the start
15%
3 of 20 measured years
Race-morning weather history
Mid-May Brooklyn: mild, occasional warm/humid coastal mornings along the Ocean Pkwy/Coney Island stretch — typical-climate, UNVERIFIED; ERA5 supplies actuals. 2020 CANCELLED (COVID); 2021 held as a distanced/virtual-heavy edition (no standard mass in-person) — flag as disrupted. Deterministic 3rd-Sat-of-May slots for 2020/2021 are climatological only; note the no/limited-race status. Wyndo tracks what this calendar slot has actually served up at the start hour — temperature, dew point, wind, and rain — including the years when weather canceled or disrupted the race, and reads the live forecast for the start once the race confirms its schedule and race week arrives.
Median start temp
58°F
p75 (a warm year): 60°F
Median dew point
50°F
at the start hour
Rain at the start
15%
3 of 20 measured years
Warmest start
66°F
in 2025
Scroll sideways to see all columns.
| Year | Start temp | Dew point | Wind | Precip (start hr) | Day's high |
|---|---|---|---|---|---|
| 2026 | 55°F | 51°F | 2 mph | dry | 77°F |
| 2025 | 66°F | 64°F | 5 mph | dry | 80°F |
| 2024 | 61°F | 53°F | 4 mph | dry | 69°F |
| 2023 | 59°F | 56°F | 5 mph | 0.2 mm | 65°F |
| 2022 | 63°F | 62°F | 2 mph | dry | 84°F |
| 2021 | 55°F | 48°F | 4 mph | dry | 72°F |
| 2020 | 65°F | 56°F | 6 mph | dry | 70°F |
| 2019 | 58°F | 43°F | 5 mph | dry | 71°F |
| 2018 | 51°F | 48°F | 10 mph | 1.7 mm | 59°F |
| 2017 | 60°F | 46°F | 10 mph | dry | 69°F |
| 2016 | 56°F | 49°F | 4 mph | dry | 62°F |
| 2015 | 60°F | 52°F | 1 mph | 0.3 mm | 72°F |
| 2014 | 53°F | 46°F | 6 mph | dry | 67°F |
| 2013 | 56°F | 50°F | 1 mph | dry | 63°F |
| 2012 | 56°F | 46°F | 3 mph | dry | 75°F |
| 2011 | 57°F | 55°F | 6 mph | dry | 72°F |
| 2010 | 62°F | 44°F | 8 mph | dry | 71°F |
| 2009 | 58°F | 56°F | 5 mph | dry | 70°F |
| 2008 | 51°F | 45°F | 11 mph | dry | 70°F |
| 2007 | 53°F | 44°F | 7 mph | dry | 57°F |
Slot climatology: each row is the weather at this race's usual calendar slot and start hour (ERA5 reanalysis at the start line) — including years when the edition was canceled or moved. A computed slot date is not a claim the race ran that day.
Your heat-adjusted goal for the half marathon
The same cited model as the full calculator, pointed at this race: the median start-hour conditions this calendar slot has served up — climatology, not a forecast.
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Race facts
- Start line
- Start on Eastern Parkway by the Brooklyn Museum (NYRR JSON-LD streetAddress "Brooklyn Museum, Eastern Parkway"; wave corrals on Eastern Pkwy between Bedford & Franklin Ave, just east of the museum). Course runs through Prospect Park and down Ocean Parkway to a FINISH on the Coney Island boardwalk. Coordinate is the Brooklyn Museum geocode — approximate; the actual corrals sit a couple of blocks east on Eastern Pkwy.
- Traditional start (not confirmed for 2027)
- 7:00 AM (America/New_York) — First wave 7:00 AM. NYRR 2026 event-page JSON-LD startDate 2026-05-16T11:00:00Z (=07:00 EDT); NYRR wave schedule staggers corrals through ~10:00 AM (last corral). Handcycle/Wheelchair divisions are welcomed (NYRR); exact adaptive gun not captured.
- Field size
- FINISHERS, 2026 (event record — "the largest half marathon in New York Road Runners history"), per NYRR 2026 race coverage/results surfaced in search ("30,341 finishers in 2026") [reported, not re-pulled from the results portal this session]. 2025 was ~28,500 finishers. Re-verify 30,341 against results.nyrr.org/event/B2026 before trusting to the digit.
- Registration
- lottery (NYRR Non-Guaranteed Entry Drawing — confirmed on the 2026 event page; plus guaranteed-entry paths). Field = cap, NOT demand.
Wyndo is not affiliated with or endorsed by the Brooklyn Half (officially the "RBC Brooklyn Half") or its organizers. Race names are used descriptively to identify the event; schedules and start times belong to the race — always confirm details on the official site. Weather guidance here is informational, never medical advice, and event alert flags on race day belong to the race's own medical team.