Forecasts and observations from the National Weather Service.
Observed conditions
90°F
Partly Cloudy
San Antonio, San Antonio International Airport (KSAT) · Observed
Wind
3 mph
Humidity
49%
Weather alerts
Heat Advisory
Heat Advisory issued September 11 at 7:51PM CDT until September 12 at 7:00PM CDT by NWS Austin/San Antonio TX
* WHAT...Temperatures up to 104 degrees and heat index values up to 110 degrees expected. * WHERE...The I-35 corridor and Coastal Plains. * WHEN...From noon to 7 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
What to do: Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Issued · Until
Forecast
National Weather Service · Issued
Tonight
77°F
Slight Chance Showers And Thunderstorms then Partly Cloudy
A slight chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 77. Heat index values as high as 102. South southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Chance of precipitation: 19%
Wind: SSE 5 to 10 mph
Saturday
101°F
Sunny
Sunny, with a high near 101. Heat index values as high as 108. South southeast wind 5 to 10 mph.
Chance of precipitation: 10%
Wind: SSE 5 to 10 mph
Saturday Night
78°F
Mostly Clear
Mostly clear, with a low around 78. Heat index values as high as 103. Southeast wind 5 to 15 mph, with gusts as high as 25 mph. New rainfall amounts less than a tenth of an inch possible.
Chance of precipitation: 10%
Wind: SE 5 to 15 mph
Sunday
99°F
Mostly Sunny
Mostly sunny, with a high near 99. Heat index values as high as 107. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Chance of precipitation: 2%
Wind: SSE 5 to 10 mph
Sunday Night
77°F
Partly Cloudy
Partly cloudy, with a low around 77. Southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Chance of precipitation: 4%
Wind: SE 5 to 15 mph
Monday
99°F
Mostly Sunny
Mostly sunny, with a high near 99. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Chance of precipitation: 6%
Wind: SSE 5 to 15 mph
Monday Night
77°F
Mostly Clear
Mostly clear, with a low around 77. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Chance of precipitation: 3%
Wind: SSE 10 to 15 mph
Tuesday
99°F
Mostly Sunny
Mostly sunny, with a high near 99. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.