San Marcos, TX Weather & Growing Conditions
Tonight
72°F
Mostly Clear
Mostly clear, with a low around 72. South wind 0 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 72°F | Mostly Clear | 0 to 10 mph S | 0% |
| Saturday | 97°F | Sunny | 0 to 5 mph SSE | 1% |
| Saturday Night | 72°F | Mostly Clear | 5 to 10 mph SSE | 0% |
| Sunday | 98°F | Mostly Sunny | 5 mph S | 0% |
| Sunday Night | 74°F | Partly Cloudy | 5 to 10 mph SSE | 11% |
| Monday | 98°F | Mostly Sunny | 5 mph SE | 11% |
| Monday Night | 73°F | Mostly Clear | 0 to 5 mph SSE | 11% |
| Tuesday | 97°F | Sunny | 0 to 5 mph NNE | 10% |
| Tuesday Night | 74°F | Partly Cloudy | 0 to 5 mph E | 13% |
| Wednesday | 97°F | Mostly Sunny | 0 to 10 mph NE | 9% |
| Wednesday Night | 73°F | Partly Cloudy | 0 to 10 mph E | 10% |
| Thursday | 97°F | Mostly Sunny | 0 to 10 mph NE | 10% |
| Thursday Night | 72°F | Partly Cloudy | 0 to 5 mph E | 6% |
| Friday | 96°F | Mostly Sunny | 5 to 10 mph NE | 6% |
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 Sep 19, 2026.