National Weather Service Forecast for: Bethany OK
Issued by: National Weather Service Norman, OK
Updated: 1:26 am CDT Aug 20, 2026
 
Overnight

Overnight: A 20 percent chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 77. East wind around 7 mph.
Slight Chance
T-storms

 Thursday

Thursday: A slight chance of showers and thunderstorms before 10am, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 102. Heat index values as high as 105. East wind around 6 mph. Chance of precipitation is 20%.
Slight Chance
T-storms

 Thursday
Night
Thursday Night: Mostly clear, with a low around 78. Southeast wind around 7 mph.
Mostly Clear

 Friday

Friday: Sunny and hot, with a high near 104. Heat index values as high as 108. South southeast wind around 7 mph.
Hot

 Friday
Night
Friday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 78. East southeast wind around 8 mph becoming south after midnight.
Mostly Clear
then Slight
Chance
T-storms
 Saturday

Saturday: Mostly sunny and hot, with a high near 103.
Hot

 Saturday
Night
Saturday Night: Mostly clear, with a low around 76.
Mostly Clear

 Sunday

Sunday: Mostly sunny and hot, with a high near 100.
Hot

 Sunday
Night
Sunday Night: Mostly clear, with a low around 79.
Mostly Clear
Lo 77 °F Hi 102 °F Lo 78 °F Hi 104 °F Lo 78 °F Hi 103 °F Lo 76 °F Hi 100 °F Lo 79 °F

Heat Advisory
 

Overnight
 
 A 20 percent chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 77. East wind around 7 mph.
Thursday
 
 A slight chance of showers and thunderstorms before 10am, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 102. Heat index values as high as 105. East wind around 6 mph. Chance of precipitation is 20%.
Thursday Night
 
 Mostly clear, with a low around 78. Southeast wind around 7 mph.
Friday
 
 Sunny and hot, with a high near 104. Heat index values as high as 108. South southeast wind around 7 mph.
Friday Night
 
 A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 78. East southeast wind around 8 mph becoming south after midnight.
Saturday
 
 Mostly sunny and hot, with a high near 103.
Saturday Night
 
 Mostly clear, with a low around 76.
Sunday
 
 Mostly sunny and hot, with a high near 100.
Sunday Night
 
 Mostly clear, with a low around 79.
Monday
 
 A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 103.
Monday Night
 
 Mostly clear, with a low around 79.
Tuesday
 
 Sunny and hot, with a high near 101.
Tuesday Night
 
 A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 77.
Wednesday
 
 Mostly sunny and hot, with a high near 99.

 

Forecast from NOAA-NWS for Bethany OK.