Best time to visit Sioux Falls

Sioux Falls is a city of two halves. September scores 83 and December scores 29 — a 54-point swing, which is the difference between a holiday and an endurance test. The month you pick matters more here than almost anywhere. Only 3 months come close to the top, which makes the timing narrow.

July is the warmest month at 30.7 °C and January the coolest at -2.7 °C — a 33.4 °C spread across the year. Around 42 days a year top 30 °C, concentrated in July and the months either side. At the other end, 157 nights a year fall below freezing: the winter here is a real one.

There is a real wet season here. May, June and August carry the rain — up to 14 wet days in a month — while January, February, March, November and December drop as low as 3. That 11-day gap is the biggest single difference between a good month and a bad one in Sioux Falls, and it moves further than the temperature does.

Daylight runs from 9 hours in winter to 15.4 in summer, enough to notice on a sightseeing itinerary.

The three strongest months are September, May, June. The one to think twice about is December. Each month below has its own page with rainfall reliability, extremes, daylight and crowd levels.

Sioux Falls month by month