10-Day Weather Forecast - San Marcos, TX

Mostly sunny. Highs in the upper 90s. South winds 5 to 10 mph. Highest heat index readings up to 105.

Clear in the evening, then becoming partly cloudy. Lows in the mid 70s. South winds 5 to 10 mph with gusts up to 20 mph.

Partly cloudy in the morning, then clearing. Highs in the upper 90s. South winds 5 to 10 mph with gusts up to 20 mph. Highest heat index readings up to 106.

Clear in the evening, then becoming partly cloudy. Lows in the mid 70s. South winds 5 to 10 mph with gusts up to 20 mph.

Mostly clear. Highs in the mid 90s. Highest heat index readings up to 105.

Mostly clear. Lows in the mid 70s. Highest heat index readings up to 105.

Partly cloudy with a slight chance of showers. Highs in the mid 90s.

Partly cloudy with a slight chance of showers. Lows in the mid 70s.

Partly cloudy in the morning, then clearing. Highs in the mid 90s.

Mostly clear. Lows in the mid 70s.

Partly cloudy. Highs in the mid 90s.

Partly cloudy. Lows in the mid 70s.

Partly cloudy. Highs in the mid 90s.

Partly cloudy with a 50% chance for rain and thunderstorms. Low temperature around 76F. Dew point will be around 74F with an average humidity of 77%. Winds will be 10 mph from the S.

Mostly sunny with widely scattered thunderstorms. Chance of storms 30%. High temperature around 97F. Dew point will be around 75F with an average humidity of 66%. Winds will be 9 mph from the S.

Mostly clear with scattered thunderstorms. Chance of storms 35%. Low temperature around 76F. Dew point will be around 74F with an average humidity of 77%. Winds will be 11 mph from the S.

Partly cloudy with widely scattered thunderstorms. Chance of storms 30%. High temperature around 97F. Dew point will be around 75F with an average humidity of 67%. Winds will be 9 mph from the S.

Partly cloudy with widely scattered thunderstorms. Chance of storms 30%. Low temperature around 76F. Dew point will be around 74F with an average humidity of 76%. Winds will be 10 mph from the S.