Race Day Weather Breakdown: Gulf Coast Marathon 2025
The forecast shows a rare cooling trend during the race. Here's how that compares to the data.
Weather Update for Tomorrow’s Race
Conditions: 56°F at start, cooling to 51°F by early afternoon
The forecast shows starting temperatures around 56°F with a cooling trend throughout the morning - dropping to the low 50s as the race progresses. This is notably different from the Gulf Coast Marathon data I analyzed, where most race days saw temperatures rise by 5-15 degrees during the race.
Source: Weather Underground, December 13, 2025, 8:00 PM CST
What makes tomorrow interesting:
The 5-degree cooling during the race is actually the opposite of what most marathoners experience. In the dataset I studied, temperature increases during the race showed a measurable impact on pacing - about 1.6 seconds per mile per degree of warming. Tomorrow’s cooling trend means you’re getting a small tailwind effect from Mother Nature rather than fighting against rising temps.
Wind is the wild card: 18-20 mph sustained northerly winds will be primarily a crosswind, with portions of the final miles potentially running into the wind. The model I built only accounts for temperature and doesn’t capture wind effects.
What this means: Tomorrow’s conditions are more favorable from a temperature perspective than the warming scenarios in my analysis. The temperature factor that correlated with severe pacing issues on days with significant warming simply isn’t present tomorrow - though pacing discipline and wind management will still matter.
The usual rules mostly apply: While going out too fast still costs you, cooler temperatures should make that penalty less severe than it would be on a hot day. Don’t let the nice weather make you reckless with early pacing, but you’ll likely have more margin for error than runners did on the warming race days in my analysis.