Average Soil Temperature in San Marcos, TX — January 2026
Data from Austin 33 NW (52.1 mi away) • 31 of 31 days reported
Monthly Summary by Depth
2" depth
51.9°F
avg
35.2°F – 65.5°F
31 days
4" depth
54.1°F
avg
40.3°F – 64.8°F
31 days
Daily Readings
| Date | 2" | 4" |
|---|---|---|
| Jan 1 | 55°F | 56.5°F |
| Jan 2 | 59.7°F | 59.5°F |
| Jan 3 | 59.5°F | 60.4°F |
| Jan 4 | 57.6°F | 59.4°F |
| Jan 5 | 60.8°F | 60.6°F |
| Jan 6 | 62.6°F | 62.6°F |
| Jan 7 | 62.1°F | 62.1°F |
| Jan 8 | 65.5°F | 64.8°F |
| Jan 9 | 61.9°F | 63.3°F |
| Jan 10 | 54.5°F | 59.5°F |
| Jan 11 | 52.2°F | 56.1°F |
| Jan 12 | 52.9°F | 55.8°F |
| Jan 13 | 54.7°F | 56.3°F |
| Jan 14 | 54.3°F | 56.5°F |
| Jan 15 | 53.2°F | 55.6°F |
| Jan 16 | 54.1°F | 55.9°F |
| Jan 17 | 49.1°F | 53.6°F |
| Jan 18 | 48.2°F | 51.6°F |
| Jan 19 | 50.9°F | 52.7°F |
| Jan 20 | 51.4°F | 53.1°F |
| Jan 21 | 57.6°F | 56.7°F |
| Jan 22 | 58.3°F | 57.9°F |
| Jan 23 | 58.5°F | 59°F |
| Jan 24 | 39.4°F | 45°F |
| Jan 25 | 36.7°F | 43.3°F |
| Jan 26 | 35.2°F | 41.5°F |
| Jan 27 | 35.2°F | 40.3°F |
| Jan 28 | 36.7°F | 40.6°F |
| Jan 29 | 43.9°F | 44.4°F |
| Jan 30 | 44.4°F | 46.4°F |
| Jan 31 | 41.7°F | 45.7°F |