Weather in Sioux Falls in October

A good month. October works. It is not the peak, but nothing about it fights you. Highs average 15.3 °C, lows 3.5 °C, and rain falls on 7 days — nothing in the month is working against you.

October ranks 4 of 12 in Sioux Falls: past the worst of the year but short of September, which is the month to book if the dates are open.

Rain on 7 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 15.3 °C days and 3.5 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 8 nights fall below freezing. Across the twenty years measured, the hottest October day reached 31.9 °C and the coldest night fell to -13 °C, and the wettest single day dropped 54 mm — roughly 98% of the month's rain in one day.

October is moderately variable: 10 mm in the driest year against 134 mm in the wettest, around an average of 55 mm. Roughly two Octobers in three land near that average, and the third does something else entirely.

Wind is light at 12.6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 68%.

How October sits in the year

The month is on the way down: 9.3 °C cooler than September, with November dropping another 8.1 °C. The first week and the last are not the same trip.

Daylight in October

11.1 hours of daylight, losing 1.4 hours across the month. That is between Sioux Falls's extremes of 15.4 and 9 hours, so days are long enough not to constrain the plan.

An inland climate

Sioux Falls has no sea to moderate it, and it shows: 43 °C separates the hottest afternoon of the year from the coldest night. That is a genuinely continental range, and it means summer and winter here are barely the same place.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

October in Sioux Falls versus nearby

If Sioux Falls is one option among several, the nearby comparison is worth making. Omaha is close enough to be a coin toss — 2.4 °C warmer, 1 day more rain. Minneapolis is close enough to be a coin toss — within a degree on temperature, 2 days more rain.

So: October works, with September the better month by 12 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Sioux Falls

See all twelve months in Sioux Falls, or where else to go in October.