Race-day weather · Wyndo for runners
Dallas Marathon weather
December 13, 2026 · Dallas, TX · scheduled start 8:00 AM (America/Chicago). 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.
Countdown
108 days to race day
The live race-day forecast unlocks 102 days from now, when December 13, 2026 enters the 7-day forecast window — a start-time read for the scheduled 8:00 AM start. Until then, live hourly data is not available; the history below shows what race morning usually looks like.
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 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.
Your race-day brief
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Race facts
- Start line
- Dallas City Hall Plaza, downtown Dallas (start and finish)
- Scheduled start
- 8:00 AM (America/Chicago) — 2026 Sunday-events page on the organizer site (checked 2026-08-17): marathon/half/50K 8:00 AM at Dallas City Hall Plaza, Sunday 2026-12-13; corrals A-D 8:00/8:10/8:20/8:30 per the organizer's 2026 Race Roster page.
- 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.