National Weather Service Forecast for: Houston TX
Issued by: National Weather Service Houston, TX
Updated: 8:11 pm CDT Jun 18, 2026
 
Tonight

Tonight: Mostly cloudy, with a low around 81. South wind 5 to 10 mph.
Mostly Cloudy

 Juneteenth

Juneteenth: Mostly sunny, with a high near 92. Heat index values as high as 109. South wind 5 to 10 mph.
Mostly Sunny

 Friday
Night
Friday Night: A 30 percent chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 80. Southeast wind 5 to 10 mph.
Chance
T-storms
 Saturday

Saturday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 91. Heat index values as high as 105. Southeast wind 5 to 10 mph.
Chance
T-storms
 Saturday
Night
Saturday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 79. Southeast wind 5 to 10 mph.
Mostly Cloudy
then Chance
T-storms
 Sunday

Sunday: A slight chance of thunderstorms before 7am. Mostly sunny, with a high near 92. Chance of precipitation is 10%.
Slight Chance
T-storms then
Mostly Sunny
 Sunday
Night
Sunday Night: Partly cloudy, with a low around 80.
Partly Cloudy

 Monday

Monday: Mostly sunny, with a high near 93.
Mostly Sunny

 Monday
Night
Monday Night: Mostly clear, with a low around 79.
Mostly Clear
Lo 81 °F Hi 92 °F Lo 80 °F Hi 91 °F Lo 79 °F Hi 92 °F Lo 80 °F Hi 93 °F Lo 79 °F

Heat Advisory
 

Tonight
 
 Mostly cloudy, with a low around 81. South wind 5 to 10 mph.
Juneteenth
 
 Mostly sunny, with a high near 92. Heat index values as high as 109. South wind 5 to 10 mph.
Friday Night
 
 A 30 percent chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 80. Southeast wind 5 to 10 mph.
Saturday
 
 A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 91. Heat index values as high as 105. Southeast wind 5 to 10 mph.
Saturday Night
 
 A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 79. Southeast wind 5 to 10 mph.
Sunday
 
 A slight chance of thunderstorms before 7am. Mostly sunny, with a high near 92. Chance of precipitation is 10%.
Sunday Night
 
 Partly cloudy, with a low around 80.
Monday
 
 Mostly sunny, with a high near 93.
Monday Night
 
 Mostly clear, with a low around 79.
Tuesday
 
 Mostly sunny, with a high near 94.
Tuesday Night
 
 Partly cloudy, with a low around 78.
Wednesday
 
 Mostly sunny, with a high near 94.
Wednesday Night
 
 Partly cloudy, with a low around 77.
Thursday
 
 Mostly sunny, with a high near 94.

 

Forecast from NOAA-NWS for Houston TX.