San Antonio Marathon

San Antonio, TX, USA · December 6, 2026

49°·64° high·Breezy·Dry

Weather

Race Day Weather

49°at start

65° high

Breezy

Dry

Cool start, warm finish

Runners will face temperatures starting at 49°F and rising to 65°F during the race. Winds will be light, coming from the NE at 9 mph with gusts up to 20 mph. With humidity around 62%, pacing should be adjusted as temperatures climb, encouraging runners to stay hydrated and consider gear for warmth in the early miles.

Race day forecast available in 26 days

5 AM

6 AM

7 AM

8 AM

9 AM

10 AM

11 AM

12 PM

1 PM

2 PM

3 PM

4 PM

5 PM

Pre-raceRace windowPost-race

Pace Calculator

Distance: 26.2mi

Target Finish Time

0:00:00

HH:MM:SS

Pace

—

Weather Adj.

—

Common Goals:

Get forecast alerts for San Antonio Marathon

We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.

Race Info

The San Antonio Marathon is held in early December in downtown San Antonio, Texas, with a marathon, a half marathon and a Friday-night 5K. The marathon and half marathon start at 7:15 AM and finish at Hemisfair. The marathon course is USATF-certified and a Boston qualifier. The race is organized by San Antonio Sports with the City of San Antonio. Source

Website