San Marcos, TX Weather & Growing Conditions
This Afternoon
79°F
Sunny
Sunny. High near 79, with temperatures falling to around 73 in the afternoon. North northwest wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Sunny | 5 to 10 mph NNW | 0% |
| Tonight | 51°F | Mostly Clear | 5 mph NNW | 0% |
| Wednesday | 74°F | Sunny | 0 to 5 mph NNE | 0% |
| Wednesday Night | 51°F | Mostly Clear | 0 mph | 0% |
| Thursday | 79°F | Mostly Sunny | 0 to 5 mph S | 3% |
| Thursday Night | 56°F | Partly Cloudy | 0 to 15 mph NW | 11% |
| Friday | 73°F | Sunny | 5 to 15 mph N | 0% |
| Friday Night | 51°F | Partly Cloudy | 5 to 10 mph N | 2% |
| Saturday | 68°F | Slight Chance Rain Showers | 5 to 10 mph N | 17% |
| Saturday Night | 49°F | Partly Cloudy | 5 to 10 mph N | 13% |
| Sunday | 69°F | Mostly Sunny | 5 to 10 mph N | 7% |
| Sunday Night | 46°F | Mostly Clear | 0 to 5 mph NNW | 8% |
| Monday | 71°F | Sunny | 0 to 5 mph NE | 4% |
| Monday Night | 47°F | Mostly Clear | 0 to 5 mph SSW | 1% |
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 Nov 4, 2026.