Race-day weather · Wyndo for runners
NYC Half weather
March 21, 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
205 days to race day
The live race-day forecast unlocks 199 days from now, when March 21, 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
35°F
median of 7 years
A warm year
50°F
75th percentile start temp
Rain at the start
0%
0 of 7 measured years
Race-morning weather history
Mid-March NYC: cold starts (often 30s–40s F), wind chill on the FDR/bridge exposed sections — typical-climate characterization, UNVERIFIED; ERA5 supplies actuals. 2020 CANCELLED (first major COVID-era cancellation) and 2021 CANCELLED (no in-person race) — exclude both as no-race years; pre-2018 editions ran in summer/January and are a different slot (do not backfill March for them). 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 the race confirms its schedule and race week arrives.
Median start temp
35°F
p75 (a warm year): 50°F
Median dew point
25°F
at the start hour
Rain at the start
0%
0 of 7 measured years
Warmest start
51°F
in 2022
Scroll sideways to see all columns.
| Year | Start temp | Dew point | Wind | Precip (start hr) | Day's high |
|---|---|---|---|---|---|
| 2026 | 35°F | 25°F | 3 mph | dry | 44°F |
| 2025 | 49°F | 48°F | 8 mph | dry | 62°F |
| 2024 | 50°F | 43°F | 7 mph | dry | 58°F |
| 2023 | 30°F | 13°F | 11 mph | dry | 41°F |
| 2022 | 51°F | 45°F | 7 mph | dry | 55°F |
| 2019 | 33°F | 21°F | 5 mph | dry | 44°F |
| 2018 | 30°F | 17°F | 7 mph | dry | 42°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: 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 Washington Ave alongside the Brooklyn Museum, Prospect Heights/Crown Heights, Brooklyn (NYRR 2026 page: "The race will start on Washington Ave near the Brooklyn Museum"; security checkpoints on Eastern Pkwy near Grand Army Plaza / Bedford Ave). Fox5 closure list places the start-corral spine on Washington Ave down toward Empire Blvd. Coordinate is the Brooklyn Museum geocode — approximate to the block. Course: Brooklyn → Brooklyn Bridge → FDR → Times Square, finish on West Drive in Central Park near 68th St.
- Traditional start (not confirmed for 2027)
- 7:00 AM (America/New_York) — First wave ~7:00 AM. NYRR 2026 event-page JSON-LD startDate 2026-03-15T11:00:00Z (=07:00 EDT); Fox5 (2026-03-13): "The first wave of runners will start around 7 a.m." Multiple waves (Wave 1/3 vs 2/4 use different transit access). Wheelchair/pro divisions start ahead of the mass field (PR lists open + wheelchair divisions); exact pro/wheelchair gun not captured. Livestream begins 7:00 AM ET.
- Field size
- FINISHERS, 2025 (event record), per NYRR 2026-03-08 press release: "record-breaking 28,709 finishers in 2025" [V, fetched via web.archive.org id_ snapshot 20260309222452]. 2026 field was capped/announced at "more than 30,000 runners" (registrants, not a finish count). Re-verify a 2026 finisher total once results settle.
- Registration
- lottery (NYRR Non-Guaranteed Entry Drawing; plus guaranteed-entry paths: 9+1, time qualifier, charity/Team for Climate, virtual). Field size = cap, NOT demand.
Wyndo is not affiliated with or endorsed by the NYC Half (officially the "United Airlines NYC 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.