San Marcos, TX Weather & Growing Conditions
Today
99°F
Sunny
Sunny, with a high near 99. Heat index values as high as 106. South wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 99°F | Sunny | 5 to 10 mph S | 3% |
| Tonight | 76°F | Mostly Clear | 5 to 10 mph S | 3% |
| Wednesday | 97°F | Mostly Sunny | 5 to 10 mph S | 2% |
| Wednesday Night | 76°F | Mostly Clear | 5 to 10 mph SSE | 1% |
| Thursday | 97°F | Mostly Sunny | 5 mph S | 3% |
| Thursday Night | 75°F | Partly Cloudy | 5 to 10 mph SSE | 3% |
| Friday | 96°F | Mostly Sunny | 0 to 5 mph S | 7% |
| Friday Night | 75°F | Partly Cloudy | 0 to 5 mph SSE | 7% |
| Saturday | 95°F | Mostly Sunny | 0 to 5 mph SSE | 3% |
| Saturday Night | 75°F | Mostly Clear | 0 to 5 mph SSE | 4% |
| Sunday | 94°F | Sunny | 0 to 10 mph S | 5% |
| Sunday Night | 75°F | Mostly Clear | 5 to 10 mph SSE | 5% |
| Monday | 95°F | Mostly Sunny | 0 to 10 mph S | 5% |
| Monday Night | 75°F | Mostly Clear | 5 to 10 mph SSE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for San Marcos, TX
Last spring frost
Feb 28
First fall frost
Nov 29
Growing season
273 days
Hardiness zone
9a
Explore more for San Marcos, TX: full frost dates · planting calendar · Texas frost dates
Climate data from the nearest NOAA station, San Marcos, Tx (2.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.