Next 12 hours
Hour by hour from the National Weather Service
7 day forecast
Highs and lows for the week
Live radar and maps
Radar map by Windy
Plan your day in San Marcos
Ready for storms
Picked for today's weather in San Marcos.
🛒Shop Ready for storms on AmazonSee what is popular →As an Amazon Associate, community.observer earns from qualifying purchases. Prices and availability are shown as of the time they were last checked and can change.
Cheap flights from Austin
Fares from the nearest big airport.
Loading Cheap flights from Austin...
Travel deals come from our partner Travelpayouts. If you book through them, community.observer may earn a commission at no extra cost to you.
Forecast in detail
Overnight, 68°. Showers and thunderstorms after 3am. Mostly cloudy, with a low around 68. Southwest wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday, 77°. Patchy fog and showers and thunderstorms likely before noon. Mostly sunny, with a high near 77. Northwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night, 55°. Mostly clear, with a low around 55. North northwest wind around 5 mph.
Wednesday, 74°. Sunny, with a high near 74. Northeast wind 0 to 5 mph.
Wednesday Night, 55°. Mostly clear, with a low around 55. South southeast wind around 0 mph.
Thursday, 79°. A slight chance of rain showers after noon. Mostly sunny, with a high near 79. South wind 0 to 5 mph. Chance of precipitation is 20%.
Thursday Night, 58°. A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 58. Northwest wind 0 to 10 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Friday, 72°. Mostly sunny, with a high near 72. North wind 5 to 10 mph, with gusts as high as 25 mph.
Friday Night, 53°. Partly cloudy, with a low around 53. North northeast wind 0 to 10 mph.
Saturday, 67°. A slight chance of rain showers. Partly sunny, with a high near 67. Chance of precipitation is 20%.