Race-day weather · Wyndo for runners
Broad Street Run weather
May 2, 2027 · Philadelphia, PA · 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
247 days to race day
The live race-day forecast unlocks 241 days from now, when May 2, 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
51°F
median of 20 years
A warm year
58°F
75th percentile start temp
Rain at the start
30%
6 of 20 measured years
Race-morning weather history
Typical early-May Philadelphia mornings: mild-to-cool (50s–60s F), occasional rain (2025 ran in rain) — typical-climate characterization, UNVERIFIED; ERA5 backfill supplies actuals. COVID disruptions: 2020 CANCELLED; 2021 held out-of-slot on Oct 10, 2021 (fall, not the May slot). The 1st-Sunday-May recurrence still describes every normal year; per slot-climatology semantics the 2020/2021 May slots remain climatological slots — flag that 2020 had no in-person race and 2021 was displaced to October. 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
51°F
p75 (a warm year): 58°F
Median dew point
44°F
at the start hour
Rain at the start
30%
6 of 20 measured years
Warmest start
71°F
in 2010
Scroll sideways to see all columns.
| Year | Start temp | Dew point | Wind | Precip (start hr) | Day's high |
|---|---|---|---|---|---|
| 2026 | 45°F | 29°F | 8 mph | dry | 61°F |
| 2025 | 66°F | 61°F | 4 mph | dry | 72°F |
| 2024 | 50°F | 47°F | 7 mph | 0.2 mm | 59°F |
| 2023 | 52°F | 46°F | 4 mph | dry | 76°F |
| 2022 | 43°F | 37°F | 4 mph | dry | 71°F |
| 2021 | 58°F | 38°F | 9 mph | dry | 86°F |
| 2020 | 58°F | 52°F | 7 mph | dry | 80°F |
| 2019 | 58°F | 57°F | 9 mph | 2.6 mm | 64°F |
| 2018 | 60°F | 52°F | 6 mph | 0.3 mm | 66°F |
| 2017 | 50°F | 39°F | 8 mph | dry | 55°F |
| 2016 | 48°F | 40°F | 3 mph | 0.2 mm | 52°F |
| 2015 | 50°F | 43°F | 3 mph | dry | 81°F |
| 2014 | 52°F | 40°F | 6 mph | dry | 62°F |
| 2013 | 46°F | 36°F | 8 mph | dry | 62°F |
| 2012 | 57°F | 53°F | 4 mph | 0.3 mm | 66°F |
| 2011 | 48°F | 41°F | 4 mph | dry | 67°F |
| 2010 | 71°F | 63°F | 6 mph | dry | 90°F |
| 2009 | 58°F | 55°F | 3 mph | 0.8 mm | 58°F |
| 2008 | 50°F | 49°F | 5 mph | dry | 72°F |
| 2007 | 49°F | 19°F | 12 mph | dry | 61°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 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
- North Broad St at Somerville Ave (near Fisher Ave), beside Central High School / Philadelphia High School for Girls, Olney/Logan; point-to-point south down Broad St to the Navy Yard finish. Coordinate is a Nominatim-anchored estimate of the start arch — approximate.
- Traditional start (not confirmed for 2027)
- 7:00 AM (America/New_York) — 7:00 AM mass start at Broad & Somerville Ave; wheelchair division 6:55 AM per City of Philadelphia 2026 details (phila.gov/2026-04-28-…). Carried to 2027; time has been stable for years but not re-published for 2027.
- Field size
- FINISHERS, 2025 edition (May 4, 2025): ~33,000 crossed the line per IBX Newsroom (news.ibx.com/broad-street-run-2025/) and CBS/Audacy day-of coverage. Field CAP is 40,000 (lottery) — press routinely cites "40,000 runners," which is the accommodation cap, not finishers. Re-verify live before ship (checked 2026-08-27).
- Registration
- lottery (cap 40,000; lottery window Feb 1–13, selection notified mid-Feb per broadstreetrun.com/phillyvoice 2026)
Wyndo is not affiliated with or endorsed by the Broad Street Run (officially the "Independence Blue Cross Broad Street 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.