Race-day weather · Wyndo for runners
Philadelphia Distance Run weather
September 20, 2026 · Philadelphia, PA · scheduled start 7:30 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.
Live read for the 7:30 AM start · September 20, 2026
The start-time read is mixed
Better conditions soon for running
- Forecast Horizon: This recommendation is ~28h out; forecast accuracy decreases over time.
Forecast checked at 5:30 AM (America/New_York) — evaluating conditions around the scheduled 7:30 AM start at the start line, roughly the first half hour. It is not a whole-course or finish-line evaluation, and forecasts shift: re-check as race morning approaches.
Race-morning weather history
Mid-September Philadelphia along the Schuylkill; warm, humid mornings. Currently UNSPONSORED (Brooks sponsors the expo only; the GoPuff title rumor is unverifiable — not used). 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 race week arrives.
Median start temp
60°F
p75 (a warm year): 65°F
Median dew point
56°F
at the start hour
Rain at the start
0%
0 of 20 measured years
Warmest start
71°F
in 2019
Scroll sideways to see all columns.
| Year | Start temp | Dew point | Wind | Precip (start hr) | Day's high |
|---|---|---|---|---|---|
| 2025 | 59°F | 55°F | 5 mph | dry | 75°F |
| 2024 | 61°F | 58°F | 6 mph | dry | 82°F |
| 2023 | 55°F | 51°F | 4 mph | dry | 78°F |
| 2022 | 63°F | 61°F | 6 mph | dry | 84°F |
| 2021 | 65°F | 56°F | 7 mph | dry | 79°F |
| 2020 | 46°F | 35°F | 7 mph | dry | 65°F |
| 2019 | 71°F | 69°F | 3 mph | dry | 84°F |
| 2018 | 66°F | 65°F | 3 mph | dry | 85°F |
| 2017 | 70°F | 69°F | 2 mph | dry | 81°F |
| 2016 | 71°F | 68°F | 5 mph | dry | 86°F |
| 2015 | 69°F | 59°F | 7 mph | dry | 79°F |
| 2014 | 64°F | 63°F | 1 mph | dry | 80°F |
| 2013 | 48°F | 41°F | 2 mph | dry | 73°F |
| 2012 | 55°F | 47°F | 3 mph | dry | 76°F |
| 2011 | 53°F | 45°F | 7 mph | dry | 69°F |
| 2010 | 58°F | 56°F | 3 mph | dry | 83°F |
| 2009 | 46°F | 45°F | 3 mph | dry | 73°F |
| 2008 | 51°F | 46°F | 3 mph | dry | 81°F |
| 2007 | 49°F | 40°F | 5 mph | dry | 67°F |
| 2006 | 63°F | 59°F | 5 mph | dry | 82°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 live forecast for the scheduled start hour.
Your race-day brief
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Race facts
- Start line
- Benjamin Franklin Pkwy NW of 22nd St, near the Rodin Museum; finish at Eakins Oval
- Scheduled start
- 7:30 AM (America/New_York) — 2026 event-listing times on the race's own RunSignUp registration page (checked 2026-08-17): half 7:30 AM EDT, 5K 7:00 AM EDT — matching the 2025 guide. The dedicated 2026 athlete guide is not yet posted (guide page still serves 2025); corral details pending.
- Field size
- UNVERIFIED — the my.raceresult.com/360553/ listing is JS-rendered; a manual count is needed before publishing a figure
- Registration
- open (RunSignUp, pace corrals)
Wyndo is not affiliated with or endorsed by the Philadelphia Distance Run (officially the "Philadelphia Distance 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.