SIOUX FALLS, S.D. – Dawn breaks over frosty rooftops this morning, a thin veil of mist curling above open fields east of town. The air carries that unmistakable late-fall edge—crisp, quiet, and hinting at the winter pattern just around the corner. Early commuters along I-29 will feel it first: 30s at sunrise with a light north breeze keeping wind chills near freezing.
According to the National Weather Service in Sioux Falls, sunshine returns strongly through the day, pushing highs into the lower 50s. But the calm, dry air will set the stage for quick cooling again tonight, when lows drop into the low 30s under partly cloudy skies. Frost is possible in rural areas north toward Dell Rapids and east toward Larchwood, Iowa.
Thursday brings a brief warm-up near 54°, but temperatures take a dip again by Halloween Friday, when highs struggle to reach the upper 40s. Trick-or-treaters can expect a chilly, dry evening across Minnehaha and Lincoln Counties, with readings near 40° by dusk and light north winds. Costumes layered with gloves or hats are a smart choice, and travel should remain clear and dry.
The weekend looks steadier, with sunshine Saturday and highs near 47°, warming closer to 60° Sunday as southerly winds return. To be fair, it’s a classic late-October swing—crisp mornings, mild afternoons, and plenty of clear sky for fall yardwork or pumpkin displays.
After all, clocks fall back at 2 a.m. Sunday, bringing darker evenings and a hint of what’s next: a chilly November pattern slowly building across the Northern Plains.
Five-Day Forecast for Sioux Falls, SD:
Wed: 52/32 – Sunny; north breeze, gusts near 20 mph.
Thu: 54/34 – Mostly sunny; cool and pleasant.
Fri: 48/30 – Partly sunny; brisk trick-or-treat evening near 40°.
Sat: 47/33 – Mostly cloudy; seasonably cool.
Sun: 59/36 – Sunny and mild; warmer trend continues.
