Race-day weather · Wyndo for runners
NYCRUNS Brooklyn Experience Half Marathon weather
April 25, 2027 · Brooklyn, NY · scheduled start 7:00 AM (America/New_York). What the start usually feels like, year by year — and a live start-time read once the race is inside the 7-day forecast window.
Countdown
240 days to race day
The live race-day forecast unlocks 234 days from now, when April 25, 2027 enters the 7-day forecast window — a start-time read for the scheduled 7:00 AM start. Until then, live hourly data is not available; the history below shows what race morning usually looks like.
Race-morning weather history
Late-April Brooklyn: mild spring, variable (cool AM, rain risk) — typical-climate, UNVERIFIED; ERA5 supplies actuals. No cancellations found for the standalone-half era; the event ran a Prospect Park loop under the older format pre-2022, so only backfill the three sourced dates. 2020/2021 status under the old marathon format not checked. Wyndo tracks what past editions of the race actually served up at the start hour — temperature, dew point, wind, and rain, and reads the live forecast for the start once race week arrives.
Scroll sideways to see all columns.
| Year | Start temp | Dew point | Wind | Precip (start hr) | Day's high |
|---|---|---|---|---|---|
| 2026 | 44°F | 40°F | 9 mph | dry | 56°F |
| 2025 | 51°F | 38°F | 12 mph | dry | 61°F |
Each row is the weather at a real past edition's date and this race's current start hour (ERA5 reanalysis at the start line).
Your heat-adjusted goal for the half marathon
The same cited model as the full calculator, pointed at this race: once this race's history is assembled, the typical start-hour conditions plug in here automatically.
Your race-day brief
Skip the taper-week refresh spiral. Email briefs for the NYCRUNS Brooklyn Experience Half Marathon: a start-hour outlook when race day enters the 7-day forecast window, updates only when it changes meaningfully, and a final look the day before.
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The first race-day outlook when your race enters the 7-day forecast window, an update when it changes meaningfully, and a final look the day before.
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Race facts
- Start line
- Start "on the border of Williamsburg and Greenpoint" in North Brooklyn near the East River waterfront (NYCRUNS: "the hip North Brooklyn neighborhoods of Williamsburg and Greenpoint"; 2025 recap: begins in Williamsburg then up Manhattan Ave in Greenpoint). Course winds the East River waterfront under the Williamsburg/Manhattan/Brooklyn Bridges, through DUMBO/downtown Brooklyn, up Fulton St & Flatbush Ave, past Grand Army Plaza to a FINISH in Prospect Park (Nethermead lawn). Coordinate is an approximate waterfront point on the WBurg/Greenpoint border — exact start street not published on the pages checked.
- Scheduled start
- 7:00 AM (America/New_York) — First wave 7:00 AM (NYCRUNS race page: waves 7:00 AM–9:40 AM). Handcycle Division starts among the field (a Handcycle winner is named in results). Wave/corral assignment by predicted pace.
- Field size
- FINISHERS, 2026 (event record), per NYCRUNS press release: "An event-record 28,052 runners finished ... on Sunday, April 26" [V]. 2025 was 24,603 finishers (same PR: "added 3,449 finishers from 2025 to 2026"); billed "third largest half marathon in the nation" and "America's fastest growing race." These are true finisher counts (chip-timed), not registrants.
- Registration
- open (NYCRUNS online registration; early-bird opened immediately post-race; NYCRUNS-member deferral policy — NOT a lottery).
Wyndo is not affiliated with or endorsed by the NYCRUNS Brooklyn Experience Half Marathon (officially the "NYCRUNS Brooklyn Experience Half Marathon") 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.