Weather in Sioux Falls in July

A good month. July is a solid month to be in Sioux Falls. Highs average 30.7 °C, lows 18.1 °C, and rain falls on 10 days — nothing in the month is working against you.

July ranks 7 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 10 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 30.7 °C days and 18.1 °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: 5 days clear 35 °C, so a serious heatwave is normal rather than notable. Across the twenty years measured, the hottest July day reached 43.3 °C and the coldest night fell to 8.9 °C, and the wettest single day dropped 73 mm — roughly 97% of the month's rain in one day.

July is moderately variable: 12 mm in the driest year against 223 mm in the wettest, around an average of 75 mm. Roughly two Julys in three land near that average, and the third does something else entirely.

Wind is light at 10.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 62%.

How July sits in the year

This is a turning point in the year — June and August sit on opposite sides of it, so the month contains the change rather than following it.

Daylight in July

July is at or near the longest days of Sioux Falls's year: 15.1 hours of daylight, losing 0.7 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

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

Peak season. Expect the highest prices of the year and to be booking well ahead.

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

July in Sioux Falls versus nearby

If Sioux Falls is one option among several, the nearby comparison is worth making. Omaha is the weaker option in July — within a degree on temperature, 2 days more rain. Minneapolis is close enough to be a coin toss — 2.2 °C cooler, 1 day more rain.

So: July works, with September the better month by 18 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 July.