Monsoonal Moisture Remains Across the Southwest; Heat Endures for the South and West Coast

Heat concerns remain across portions of the South and West Coast where a few new daily record highs are forecast. Monsoonal moisture transport continues across areas of the Southwest into early next week and may generate flash flooding, especially near recent burn scars. Further east, showers and thunderstorms are expected along and ahead of a cold front from the Plains to the Appalachians. Read More >

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Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

A Few Clouds

83°F

28°C

Humidity	59%
Wind Speed	SW 5 mph
Barometer	30.12 in (1018.9 mb)
Dewpoint	67°F (19°C)
Visibility	10.00 mi
Heat Index	86°F (30°C)
Last update	27 Jun 12:56 am CDT

More Information:

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

Extended Forecast for

San Marcos TX

Overnight

Slight Chance
T-storms
Low: 75 °F
Monday

Chance
T-storms
High: 98 °F
Monday
Night

Chance
T-storms
Low: 74 °F
Tuesday

Chance
T-storms
High: 92 °F
Tuesday
Night

Chance
T-storms then
Partly Cloudy
Low: 73 °F
Wednesday

Mostly Sunny
then Chance
T-storms
High: 90 °F
Wednesday
Night

Chance
T-storms then
Partly Cloudy
Low: 72 °F
Thursday

Partly Sunny
then Chance
T-storms
High: 87 °F
Thursday
Night

Chance
T-storms then
Partly Cloudy
Low: 73 °F

Detailed Forecast

Overnight

A 10 percent chance of showers and thunderstorms after 5am. Mostly clear, with a low around 75. South southwest wind 5 to 10 mph.

Monday

A slight chance of showers and thunderstorms before 8am, then a chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 98. Heat index values as high as 101. West northwest wind 5 to 15 mph becoming northeast in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 30%.

Monday Night

A 50 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 74. North wind 10 to 15 mph becoming south in the evening. Winds could gust as high as 25 mph. New rainfall amounts between a quarter and half of an inch possible.

Tuesday

A 40 percent chance of showers and thunderstorms after 8am. Partly sunny, with a high near 92. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.

Tuesday Night

A 40 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 73. East northeast wind 5 to 10 mph becoming southeast after midnight. Winds could gust as high as 20 mph.

Wednesday

A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. North northeast wind 5 to 15 mph becoming east in the afternoon. Winds could gust as high as 25 mph.

Wednesday Night

A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 72. Southeast wind 5 to 15 mph, with gusts as high as 20 mph.

Thursday

A 30 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 87. East southeast wind 5 to 10 mph.

Thursday Night

A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 73. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

Friday

A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 91.

Friday Night

A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.

Saturday

Mostly sunny, with a high near 95.

Saturday Night

Partly cloudy, with a low around 75.

Sunday

Mostly sunny, with a high near 96.