National Weather Service Forecast for: Siloam Springs AR
Issued by: National Weather Service Tulsa, OK
Updated: 10:50 pm CDT Jun 18, 2026
 
Tonight

Tonight: A slight chance of showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 65. Northeast wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Showers
Likely

 Juneteenth

Juneteenth: A 30 percent chance of showers and thunderstorms, mainly before 7am. Mostly cloudy, with a high near 83. Southeast wind around 5 mph.
Chance
Showers then
Mostly Cloudy
 Friday
Night
Friday Night: A 30 percent chance of showers after 4am. Mostly cloudy, then gradually becoming mostly clear, with a low around 68. Southeast wind around 5 mph.
Mostly Cloudy
then Chance
Showers
 Saturday

Saturday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83. South wind around 5 mph.
Chance
T-storms

 Saturday
Night
Saturday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71. South wind 5 to 10 mph. Chance of precipitation is 30%.
Slight Chance
T-storms then
Chance
Showers
 Sunday

Sunday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. South wind 10 to 15 mph, with gusts as high as 25 mph.
Chance
T-storms

 Sunday
Night
Sunday Night: Showers and thunderstorms. Some of the storms could produce heavy rainfall. Low around 70. South wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.
Heavy Rain

 Monday

Monday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 82. South wind 5 to 10 mph becoming west in the afternoon.
Chance
T-storms

 Monday
Night
Monday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66. Northeast wind around 5 mph.
Chance
T-storms
Lo 65 °F Hi 83 °F Lo 68 °F Hi 83 °F Lo 71 °F Hi 87 °F Lo 70 °F Hi 82 °F Lo 66 °F

Hazardous Weather Outlook
 

Tonight
 
 A slight chance of showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 65. Northeast wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Juneteenth
 
 A 30 percent chance of showers and thunderstorms, mainly before 7am. Mostly cloudy, with a high near 83. Southeast wind around 5 mph.
Friday Night
 
 A 30 percent chance of showers after 4am. Mostly cloudy, then gradually becoming mostly clear, with a low around 68. Southeast wind around 5 mph.
Saturday
 
 A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83. South wind around 5 mph.
Saturday Night
 
 A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71. South wind 5 to 10 mph. Chance of precipitation is 30%.
Sunday
 
 A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. South wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
 
 Showers and thunderstorms. Some of the storms could produce heavy rainfall. Low around 70. South wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.
Monday
 
 A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 82. South wind 5 to 10 mph becoming west in the afternoon.
Monday Night
 
 A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66. Northeast wind around 5 mph.
Tuesday
 
 A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 82. East wind around 5 mph becoming northwest in the afternoon.
Tuesday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67. Northeast wind around 5 mph becoming calm in the evening.
Wednesday
 
 A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. Calm wind becoming northeast around 5 mph in the afternoon.
Wednesday Night
 
 A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67. East wind around 5 mph becoming calm in the evening.
Thursday
 
 A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83. South wind around 5 mph.

 

Forecast from NOAA-NWS for Siloam Springs AR.