San Marcos, TX Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for San Marcos, TX in one place.
Sunny, with a high near 101. South southwest wind around 5 mph.
Local Weather Overview
This forecast page for San Marcos, TX is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Aug 23, 2026 6:52 PM CDT.
The active forecast window currently covers Aug 25 to Aug 29, 2026 for San Marcos, TX.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 25 to Aug 29, 2026
- Latest sync
- Aug 23, 2026 6:52 PM CDT
- Forecast office
- EWX
- Source
- NOAA / NWS
Daily Outlook
This Week in San Marcos
Tuesday looks like the warmest upcoming period in San Marcos at 101 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 76 degrees F.
The strongest winds are forecast for Tuesday Night at about 5 to 10 mph S.
The forecast from Aug 25 through Aug 29 stays mostly dry.
Forecast Details
- Last updated
- Aug 23, 2026 6:52 PM CDT
- Coverage
- 5 days
- Time zone
- America/Chicago
- Forecast office
- EWX
- Radar station
- KEWX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 76. South wind 5 to 10 mph.
Sunny, with a high near 101. South wind around 5 mph.
Mostly clear, with a low around 78. South wind around 5 mph.
Sunny, with a high near 101. South wind 0 to 5 mph.
Partly cloudy, with a low around 77.
Mostly sunny, with a high near 100.
Mostly clear, with a low around 76.
Sunny, with a high near 99.
Mostly clear, with a low around 76.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Aug 25
|
Sunny
|
101°F |
5 mph
SSW
|
|
Tuesday Night
Aug 25
|
Mostly Clear
|
76°F |
5 to 10 mph
S
|
|
Wednesday
Aug 26
|
Sunny
|
101°F |
5 mph
S
|
|
Wednesday Night
Aug 26
|
Mostly Clear
|
78°F |
5 mph
S
|
|
Thursday
Aug 27
|
Sunny
|
101°F |
0 to 5 mph
S
|
|
Thursday Night
Aug 27
|
Partly Cloudy
|
77°F |
5 mph
SSE
|
|
Friday
Aug 28
|
Mostly Sunny
|
100°F |
5 mph
SSE
|
|
Friday Night
Aug 28
|
Mostly Clear
|
76°F |
5 mph
SSE
|
|
Saturday
Aug 29
|
Sunny
|
99°F |
5 mph
S
|
|
Saturday Night
Aug 29
|
Mostly Clear
|
76°F |
5 to 10 mph
SSE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around San Marcos.
