San Marcos, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Marcos, a city in Hays County, Texas.
Tonight
73°F
Partly Cloudy
Partly cloudy, with a low around 73. South southeast wind 0 to 10 mph.
7-day forecast for San Marcos
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 73°F | Partly Cloudy | 0 to 10 mph SSE | 0% |
| Saturday | 97°F | Sunny | 0 to 5 mph SSE | 0% |
| Saturday Night | 73°F | Mostly Clear | 5 to 10 mph SSE | 0% |
| Sunday | 97°F | Mostly Sunny | 5 mph S | 0% |
| Sunday Night | 74°F | Partly Cloudy | 5 to 10 mph SSE | 11% |
| Monday | 97°F | Mostly Sunny | 0 to 5 mph SE | 11% |
| Monday Night | 74°F | Mostly Clear | 0 to 5 mph SSE | 11% |
| Tuesday | 97°F | Sunny | 0 to 5 mph ENE | 10% |
| Tuesday Night | 75°F | Partly Cloudy | 0 to 5 mph E | 14% |
| Wednesday | 97°F | Mostly Sunny | 0 to 10 mph NE | 10% |
| Wednesday Night | 75°F | Partly Cloudy | 0 to 10 mph E | 10% |
| Thursday | 96°F | Mostly Sunny | 0 to 10 mph NE | 10% |
| Thursday Night | 73°F | Partly Cloudy | 0 to 5 mph E | 6% |
| Friday | 96°F | Mostly Sunny | 0 to 10 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for San Marcos (29.872, -97.936). Updated through the day.
Growing snapshot for San Marcos
Last spring frost
Feb 28
First fall frost
Nov 29
Growing season
273 days
Hardiness zone
9a
More local growing data for San Marcos: nearby ZIP 78666 weather · frost dates · planting calendar · Texas frost dates
Nearby towns & communities
Bear Creek
Belterra
Buda
Driftwood
Dripping Springs
Kyle
Mountain City
Niederwald
Uhland
Wimberley
Woodcreek
Climate data from the nearest NOAA station, San Marcos, Tx (2.1 mi from San Marcos). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.