South Texas International Marathon

Donna, TX, USA • December 7, 2025
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partly-cloudy-day Partly cloudy throughout the day.

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South Texas International Marathon’s (STIM) unique course will take runners through four cities and two counties! This Boston Qualifier marathon will make its start at the “Heart of the Valley”, Donna, Texas. Runners will then cross through historic downtown areas of Weslaco, Mercedes and La Feria. The grand finish line will be at the Mercedes FEMA Dome in Mercedes, Texas. Source

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When is the 2025 South Texas International Marathon?

The 2025 South Texas International Marathon will be held on Sunday December 7, 2025.

Is the South Texas International Marathon a Boston Marathon Qualfier?

Yes, the South Texas International Marathon is an official Boston Marathon qualifier.

What is the time limit for the South Texas International Marathon?

The time limit for the South Texas International Marathon is 6.5 hours.

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Historical Weather

RunScore
Run Score: 8
Temp
69°F
Min/Max
56°/69°F
Dew
59°F
Days of Rain
0/2
Wind
8mph
Tap a row for details.
YearLow / HighRain

South Texas International Marathon 2024 Weather History

Partly cloudy throughout the day with early morning rain.

2024
cloudy
51°/ 62°-
Run Score: 9

South Texas International Marathon 2023 Weather History

Clearing in the afternoon.

2023
partly-cloudy-night
61°/ 76°-
Run Score: 8
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Setting up a racecast.io account will allow you to start building a reputation in the community. Over time you'll be able to rate races, join the discussion, and post in the community.

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You Need an Account For That

Setting up a racecast.io account will allow you to start building a reputation in the community. Over time you'll be able to rate races, join the discussion, and post in the community.

Right now we are invite only, you can get on the waitlist by entering your email below:

OR