Harman US

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

WhenTempForecastWindPrecip
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

All Texas locations ›

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.