National Weather Service Forecast for: McAlester OK
Issued by: National Weather Service Tulsa, OK
Updated: 2:50 am CDT Aug 20, 2026
 
Overnight

Overnight: Partly cloudy, with a low around 80. Calm wind.
Partly Cloudy

 Thursday

Thursday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 105. Heat index values as high as 109. Calm wind becoming south around 5 mph. Chance of precipitation is 20%.
Mostly Sunny
then Slight
Chance
T-storms
 Thursday
Night
Thursday Night: A slight chance of thunderstorms before 7pm. Mostly clear, with a low around 75. Calm wind. Chance of precipitation is 10%.
Slight Chance
T-storms then
Mostly Clear
 Friday

Friday: A 20 percent chance of showers and thunderstorms after 4pm. Sunny and hot, with a high near 105. Heat index values as high as 111. Calm wind becoming east around 5 mph.
Sunny then
Slight Chance
T-storms
 Friday
Night
Friday Night: A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 77. Calm wind becoming south around 5 mph. Chance of precipitation is 20%.
Slight Chance
T-storms

 Saturday

Saturday: Mostly sunny and hot, with a high near 104. Calm wind becoming southwest around 5 mph.
Hot

 Saturday
Night
Saturday Night: Mostly clear, with a low around 76. East wind around 5 mph becoming calm.
Mostly Clear

 Sunday

Sunday: Mostly sunny and hot, with a high near 101. Calm wind becoming southeast around 5 mph in the afternoon.
Hot

 Sunday
Night
Sunday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 79. East wind around 5 mph.
Mostly Clear
then Slight
Chance
T-storms
Lo 80 °F Hi 105 °F Lo 75 °F Hi 105 °F Lo 77 °F Hi 104 °F Lo 76 °F Hi 101 °F Lo 79 °F

Hazardous Weather Outlook
Heat Advisory
 

Overnight
 
 Partly cloudy, with a low around 80. Calm wind.
Thursday
 
 A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 105. Heat index values as high as 109. Calm wind becoming south around 5 mph. Chance of precipitation is 20%.
Thursday Night
 
 A slight chance of thunderstorms before 7pm. Mostly clear, with a low around 75. Calm wind. Chance of precipitation is 10%.
Friday
 
 A 20 percent chance of showers and thunderstorms after 4pm. Sunny and hot, with a high near 105. Heat index values as high as 111. Calm wind becoming east around 5 mph.
Friday Night
 
 A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 77. Calm wind becoming south around 5 mph. Chance of precipitation is 20%.
Saturday
 
 Mostly sunny and hot, with a high near 104. Calm wind becoming southwest around 5 mph.
Saturday Night
 
 Mostly clear, with a low around 76. East wind around 5 mph becoming calm.
Sunday
 
 Mostly sunny and hot, with a high near 101. Calm wind becoming southeast around 5 mph in the afternoon.
Sunday Night
 
 A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 79. East wind around 5 mph.
Monday
 
 Mostly sunny and hot, with a high near 103. South wind 5 to 10 mph.
Monday Night
 
 Mostly clear, with a low around 79. South wind 5 to 10 mph.
Tuesday
 
 Mostly sunny and hot, with a high near 103. West wind around 5 mph.
Tuesday Night
 
 Mostly clear, with a low around 77. East wind around 5 mph becoming south after midnight.
Wednesday
 
 Mostly sunny and hot, with a high near 100. South wind around 5 mph becoming northwest in the afternoon.

 

Forecast from NOAA-NWS for McAlester OK.