Race-day weather · Wyndo for runners
Dallas Marathon weather
December 13, 2026 · Dallas, TX · traditional start around 8:00 AM (America/Chicago) — not yet confirmed for 2026. 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
144 days to race day
The live race-day forecast unlocks 138 days from now, when December 13, 2026 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 2026 start time hasn't been published yet — the 8:00 AM start shown here is carried from a previous edition. We'll switch on the live start-time read when the race posts its schedule.
Typical start temp
46°F
median of 20 years
A warm year
52°F
75th percentile start temp
Rain at the start
25%
5 of 20 measured years
Race-morning weather history
December 2013 ice storm forced full cancellation — the canonical Dallas weather story; race days can swing from 70s F to freezing rain. 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
46°F
p75 (a warm year): 52°F
Median dew point
41°F
at the start hour
Rain at the start
25%
5 of 20 measured years
Warmest start
66°F
in 2012
Scroll sideways to see all columns.
| Year | Start temp | Dew point | Wind | Precip (start hr) | Day's high |
|---|---|---|---|---|---|
| 2025 | 33°F | 23°F | 16 mph | dry | 52°F |
| 2024 | 46°F | 45°F | 5 mph | 0.2 mm | 55°F |
| 2023 | 36°F | 20°F | 10 mph | dry | 54°F |
| 2022 | 52°F | 51°F | 7 mph | dry | 59°F |
| 2021 | 31°F | 27°F | 6 mph | dry | 59°F |
| 2020 | 43°F | 36°F | 11 mph | 0.6 mm | 44°F |
| 2019 | 49°F | 46°F | 12 mph | dry | 69°F |
| 2018 | 39°F | 35°F | 10 mph | dry | 50°F |
| 2017 | 33°F | 27°F | 5 mph | dry | 72°F |
| 2016 | 52°F | 48°F | 13 mph | 0.4 mm | 73°F |
| 2015 | 54°F | 49°F | 8 mph | 2.3 mm | 72°F |
| 2014 | 63°F | 60°F | 11 mph | dry | 68°F |
| 2013 | 27°F | 26°F | 1 mph | dry | 36°F |
| 2012 | 66°F | 65°F | 12 mph | dry | 72°F |
| 2011 | 37°F | 33°F | 5 mph | dry | 53°F |
| 2010 | 34°F | 16°F | 15 mph | dry | 47°F |
| 2009 | 46°F | 45°F | 4 mph | dry | 66°F |
| 2008 | 64°F | 58°F | 18 mph | dry | 77°F |
| 2007 | 60°F | 58°F | 10 mph | 3.3 mm | 65°F |
| 2006 | 46°F | 24°F | 9 mph | dry | 53°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 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
- Dallas City Hall Plaza, downtown Dallas (start and finish)
- Traditional start (not confirmed for 2026)
- 8:00 AM (America/Chicago) — 2026 start time not yet published; 2025 marathon/half/50K/relay all started 8:00 AM Sunday at Dallas City Hall Plaza.
- Field size
- 2025 full-marathon finishers 3,847 (~19,000 across all festival events)
- Registration
- open
Wyndo is not affiliated with or endorsed by the Dallas Marathon (officially the "BMW Dallas 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.