San Marcos, TX Weather Forecast
Local 7-day forecast
Mostly Sunny then Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for San Marcos, TX in one place.
A chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 86. South southeast wind 0 to 10 mph. Chance of precipitation is 30%.
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: May 24, 2026 11:57 AM CDT.
The active forecast window currently covers May 26 to May 30, 2026 for San Marcos, TX.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 26 to May 30, 2026
- Latest sync
- May 24, 2026 11:57 AM CDT
- Forecast office
- EWX
- Source
- NOAA / NWS
Daily Outlook
This Week in San Marcos
Friday looks like the warmest upcoming period in San Marcos at 90 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 71 degrees F.
The strongest winds are forecast for Tuesday at about 0 to 10 mph SSE.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- May 24, 2026 11:57 AM 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
A chance of showers and thunderstorms before 1am, then showers and thunderstorms. Mostly cloudy, with a low around 71. South southeast wind 5 to 10 mph. Chance of precipitation is 90%.
Showers and thunderstorms. Mostly cloudy, with a high near 82. South southeast wind 5 to 10 mph. Chance of precipitation is 90%.
Showers and thunderstorms likely before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Southeast wind 0 to 5 mph. Chance of precipitation is 60%.
A slight chance of showers and thunderstorms before 7am. Partly sunny, with a high near 88. East southeast wind 0 to 5 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 73. Chance of precipitation is 20%.
Mostly sunny, with a high near 90.
Partly cloudy, with a low around 74.
A slight chance of showers and thunderstorms after 7am. Partly sunny, with a high near 89. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 73.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
May 26
|
Mostly Sunny then Chance Showers And Thunderstorms
|
86°F |
0 to 10 mph
SSE
|
|
Tuesday Night
May 26
|
Chance Showers And Thunderstorms
|
71°F |
5 to 10 mph
SSE
|
|
Wednesday
May 27
|
Showers And Thunderstorms
|
82°F |
5 to 10 mph
SSE
|
|
Wednesday Night
May 27
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
71°F |
0 to 5 mph
SE
|
|
Thursday
May 28
|
Slight Chance Showers And Thunderstorms then Partly Sunny
|
88°F |
0 to 5 mph
ESE
|
|
Thursday Night
May 28
|
Slight Chance Showers And Thunderstorms
|
73°F |
0 to 5 mph
SSE
|
|
Friday
May 29
|
Mostly Sunny
|
90°F |
0 to 5 mph
S
|
|
Friday Night
May 29
|
Partly Cloudy
|
74°F |
5 mph
SSE
|
|
Saturday
May 30
|
Slight Chance Showers And Thunderstorms
|
89°F |
5 to 10 mph
SSE
|
|
Saturday Night
May 30
|
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
|
73°F |
5 mph
E
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around San Marcos.
