Excessive Rainfall Areas Today; Tropical Storm Jerry Forms

Heavy to excessive rainfall is possible today and tonight ahead of and along a cold front crossing portions of Kentucky, middle Tennessee, the Ohio Valley and New Mexico. Tropical Storm Jerry, the tenth named storm of the 2025 season, has formed over the central tropical Atlantic. Jerry is expected to be near or north of the northern Leeward Islands on Thursday and Friday. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Partly Cloudy

85°F

29°C

Humidity	63%
Wind Speed	S 3 mph
Barometer	30.08 in (1017.6 mb)
Dewpoint	71°F (22°C)
Visibility	10.00 mi
Heat Index	90°F (32°C)
Last update	7 Oct 10:56 am CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

San Marcos TX

Today
High: 93 °F
Slight Chance
Showers
Tonight
Low: 70 °F
Slight Chance
Showers then
Partly Cloudy
Wednesday
High: 92 °F
Mostly Sunny
Wednesday Night
Low: 69 °F
Mostly Clear
Thursday
High: 91 °F
Sunny
Thursday Night
Low: 64 °F
Mostly Clear
Friday
High: 91 °F
Sunny
Friday Night
Low: 60 °F
Clear
Saturday
High: 91 °F
Sunny

Detailed Forecast

Today

A chance of sprinkles between 1pm and 4pm, then a slight chance of showers after 4pm. Mostly sunny, with a high near 93. East northeast wind around 5 mph. Chance of precipitation is 20%.

Tonight

A 10 percent chance of showers before 7pm. Partly cloudy, with a low around 70. East northeast wind around 5 mph becoming calm in the evening.

Wednesday

Mostly sunny, with a high near 92. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.

Wednesday Night

Mostly clear, with a low around 69. Northeast wind 5 to 10 mph.

Thursday

Sunny, with a high near 91. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.

Thursday Night

Mostly clear, with a low around 64. East northeast wind around 5 mph.

Friday

Sunny, with a high near 91. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.