| National Weather Service Forecast for:
Siloam Springs AR Issued by: National Weather Service Tulsa, OK |
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| Updated: 2:50 am CDT Aug 20, 2026 | ||||||||||||||||||
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| Overnight |
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Calm wind. |
| Thursday |
Mostly cloudy through mid morning, then gradual clearing, with a high near 98. Heat index values as high as 101. Calm wind becoming north around 5 mph in the afternoon. |
| Thursday Night |
A 20 percent chance of showers after 4am. Mostly clear, with a low around 71. North wind around 5 mph becoming east after midnight. |
| Friday |
A 20 percent chance of showers before 10am. Partly sunny, then gradually becoming sunny, with a high near 99. Heat index values as high as 102. North wind around 5 mph becoming southeast in the morning. |
| Friday Night |
A 20 percent chance of showers after 1am. Mostly clear, with a low around 73. Calm wind becoming east around 5 mph. |
| Saturday |
A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly sunny, with a high near 98. South wind around 5 mph becoming west in the afternoon. Chance of precipitation is 20%. |
| Saturday Night |
Mostly clear, with a low around 72. East wind around 5 mph. |
| Sunday |
Mostly sunny, with a high near 95. Southeast wind around 5 mph. |
| Sunday Night |
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 73. Southeast wind 5 to 10 mph. |
| Monday |
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 95. South wind around 10 mph, with gusts as high as 20 mph. |
| Monday Night |
Mostly clear, with a low around 74. South wind 5 to 10 mph. |
| Tuesday |
Sunny, with a high near 98. South wind 5 to 10 mph becoming west in the afternoon. |
| Tuesday Night |
Partly cloudy, with a low around 73. North wind around 5 mph becoming southeast after midnight. |
| Wednesday |
A 20 percent chance of showers. Mostly sunny, with a high near 96. Southeast wind around 5 mph becoming northwest in the afternoon. |
Forecast from NOAA-NWS for Siloam Springs AR.