Summer temperatures · Iowa
How hot does Sioux City get in summer?
In a typical summer, June to August, Sioux City averages highs around 83°F and lows around 61°F.
About 25 days a year reach 90°F or hotter, and about one reaches 100°F. About 98 days a year get to 80°F or warmer. That makes it the 55th coolest summer of the 129 US cities we track.
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The hottest high in the forecast for the next 48 hours is about 51°F.
Sioux City reaches 90°F on about 25 days a year, then averages winter highs near 32°F, so the city gets to use the whole thermostat every year.
Live 48-hour forecast from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Summer at a glance
| Average summer high | 83°F |
|---|---|
| Average summer low | 61°F |
| Days a year at 80°F or warmer | 98 |
| Days a year at 90°F or hotter | 25 |
| Days a year at 100°F or hotter | 1 |
| Average winter high, for comparison | 32°F |
Summer here is June to August. Counts are averages a year.
Cities with about the same summer
- Medford, Oregon: highs around 88°F, lows around 56°F
- Detroit, Michigan: highs around 82°F, lows around 63°F
- Denver, Colorado: highs around 87°F, lows around 57°F
More about the weather here
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00014943.