Race-day weather · Wyndo for runners
Cherry Blossom Ten Mile Run weather
April 4, 2027 · Washington, DC · traditional start around 7:30 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
219 days to race day
The live race-day forecast unlocks 213 days from now, when April 4, 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
46°F
median of 10 years
A warm year
49°F
75th percentile start temp
Rain at the start
0%
0 of 10 measured years
Race-morning weather history
Typical early-April DC mornings: chilly (40s F), sometimes breezy — timed to blossom peak; typical-climate characterization, UNVERIFIED; ERA5 backfill supplies actuals. COVID: 2020 CANCELLED (virtual only) — omitted from historicalRaceDates; 2021 displaced to Sep 12, 2021 (warm-season conditions, NOT an April slot) — EXCLUDED from historicalRaceDates: slotClimatologyComparable is a whole-list flag, so a lone September date would pollute the April climatology; dropped rather than mark the whole list non-comparable. Because recurrence is FLOATING, only the hand-listed dates are backfilled — no auto-computed April slots. 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
46°F
p75 (a warm year): 49°F
Median dew point
34°F
at the start hour
Rain at the start
0%
0 of 10 measured years
Warmest start
62°F
in 2025
Scroll sideways to see all columns.
| Year | Start temp | Dew point | Wind | Precip (start hr) | Day's high |
|---|---|---|---|---|---|
| 2026 | 49°F | 46°F | 6 mph | dry | 71°F |
| 2025 | 62°F | 58°F | 2 mph | dry | 66°F |
| 2024 | 40°F | 32°F | 6 mph | dry | 64°F |
| 2023 | 45°F | 31°F | 11 mph | dry | 56°F |
| 2022 | 47°F | 42°F | 1 mph | dry | 58°F |
| 2019 | 48°F | 46°F | 4 mph | dry | 73°F |
| 2018 | 50°F | 34°F | 7 mph | dry | 63°F |
| 2017 | 42°F | 33°F | 6 mph | dry | 65°F |
| 2016 | 36°F | 15°F | 15 mph | dry | 52°F |
| 2015 | 40°F | 24°F | 7 mph | dry | 66°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 10-miler
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.
Your race-day brief
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Race facts
- Start line
- Washington Monument Grounds, start/finish near 15th St NW; loop course around the Tidal Basin, Hains Point, Memorial Bridge, Rock Creek Pkwy and the National Mall. Coordinate is the Monument itself (Nominatim) — the actual start arch is on 15th St by the grounds, approximate.
- Traditional start (not confirmed for 2027)
- 7:30 AM (America/New_York) — 10-Mile: wheelchair/authorized-disability athletes 7:29 AM, elite men + first (Yellow) wave 7:30 AM (cherryblossom.org wave-start; 2027 schedule reiterates 7:30 AM). Subsequent color waves stagger after. 5K starts separately (Saturday for recent editions — verify per year).
- Field size
- FINISHERS, 2025 10-Mile (record): 19,920 (official 2025 results/program, cherryblossom.org; corroborated by LetsRun). Prior refs: 17,432 finishers 2019; 5,888 in the reduced Sep-2021 edition. Field is lottery-capped; 5K finishers are counted separately. Re-verify live before ship (checked 2026-08-27).
- Registration
- lottery (10-Mile lottery ~Dec 14–Jan 5 per cherryblossom.org; guaranteed-entry/charity paths exist)
Wyndo is not affiliated with or endorsed by the Cherry Blossom Ten Mile Run (officially the "Credit Union Cherry Blossom Ten Mile Run") 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.