Weather in Fort Thompson, SD
Updated 2026-08-11 12:00 local time · ZIP codes 57339
Overcast
No government weather alerts were returned for this location at the latest update.
Next hours
77°5% rain
89°4% rain89°3% rain89°3% rain90°3% rain90°2% rain89°2% rain88°2% rain85°3% rain
81°4% rain79°6% rain78°7% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 7%).
It feels like 80°F with winds near 10 mph.
85°F, 3% rain chance and 9 mph wind.
Visibility is around 10 mi; gusts may reach 23 mph.
Current temperature is 77°F, wind 10 mph, rain chance up to 7%.
UV index is 5. Sunscreen and sunglasses are sensible for longer outdoor time.
Fort Thompson weather today
Overcast and 77°F in Fort Thompson, SD. Today's high is 90°F with a 36% rain chance. Winds are around 10 mph with gusts near 12 mph. Relative humidity is 100%, pressure is 29.92 inHg, and visibility is about 10 miles.
Tonight and tomorrow in Fort Thompson
Sunrise is at 06:37 AM and sunset is at 08:48 PM. Tomorrow's forecast calls for Sunny with a high near 93°F and a low near 68°F. The maximum rain chance is 58%.