10-Day Weather Forecast - San Marcos, TX

Mostly cloudy in the morning, then partly cloudy with a slight chance of showers and thunderstorms in the afternoon. Humid with highs in the mid 90s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 20 percent. Highest heat index readings up to 106.

Partly cloudy in the evening, then becoming cloudy. A slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Some thunderstorms may produce heavy rainfall. Humid with lows in the mid 70s. Southeast winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 50 percent.

Showers likely with a slight chance of thunderstorms in the morning, then showers with thunderstorms likely in the afternoon. Some thunderstorms may produce heavy rainfall in the morning. Some thunderstorms may produce heavy rainfall in the afternoon. Humid with highs in the upper 80s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain near 100 percent.

A chance of thunderstorms. Showers. Some thunderstorms may produce heavy rainfall. Locally heavy rainfall possible after midnight. Lows in the lower 70s. Southeast winds around 5 mph. Chance of rain near 100 percent.

Showers with a chance of thunderstorms. Some thunderstorms may produce heavy rainfall. Highs in the lower 80s. Chance of rain 90 percent.

Showers. A chance of thunderstorms, mainly in the evening. Lows in the upper 60s. Chance of rain 80 percent.

Cloudy with showers likely. A slight chance of thunderstorms in the afternoon. Highs around 80. Chance of rain 70 percent.

Mostly cloudy with a 50 percent chance of showers. Lows in the upper 60s.

Cloudy with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs around 80. Chance of rain 50 percent.

Mostly cloudy with a slight chance of showers. Lows in the mid 60s.

Mostly cloudy. A slight chance of showers in the morning, then a chance of showers with a slight chance of thunderstorms in the afternoon. Highs around 80. Chance of rain 30 percent.

Mostly cloudy in the evening, then becoming partly cloudy. Lows in the mid 60s.

Mostly cloudy in the morning, then becoming partly cloudy. A slight chance of showers. Highs in the lower 80s.

Clear. Low temperature around 63F. Dew point will be around 56F with an average humidity of 66%. Winds will be 8 mph from the NNE.

Sunny. High temperature around 82F. Dew point will be around 56F with an average humidity of 52%. Winds will be 8 mph from the NNE.

Clear. Low temperature around 62F. Dew point will be around 52F with an average humidity of 61%. Winds will be 8 mph from the NNE.

Sunny. High temperature around 82F. Dew point will be around 60F with an average humidity of 57%. Winds will be 9 mph from the NNE.

Clear. Low temperature around 64F. Dew point will be around 58F with an average humidity of 69%. Winds will be 7 mph from the N.