Humid cities · Iowa
How humid is Sioux City in summer?
Across June, July and August, the dew point in Sioux City averages about 62.5°F, which is sticky on the usual dew point scale.
July is the muggiest month, with the dew point averaging about 64.9°F. On NOAA’s hour by hour normals, about 529 hours, about 6% of the year, average a dew point of 65°F or more. That makes it the 51st most humid summer of the 124 US cities we track.
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The highest dew point in the forecast for the next 48 hours is about 36°F, which is dry.
Sioux City’s summer dew point averages about 62.5°F, and July takes it to about 65. The prairie does damp better than you’d think.
Live 48-hour forecast from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Summer humidity at a glance
| Dew point, June to August | 62.5°F |
|---|---|
| Muggiest month | July, 64.9°F |
| Hours a year at a 65°F dew point or more | 529 (6%) |
| How summer feels | sticky |
The dew point is the temperature the air would have to cool to for dew to form, so the higher it is, the more water the air holds. Forecasters usually call under 55°F comfortable, 55 to 65°F sticky and 65°F or more muggy; 70°F or more feels tropical.
Cities with about the same summer air
- Des Moines, Iowa: about 62.8°F
- Quad Cities, Illinois and Iowa: about 62.8°F
- Indianapolis, Indiana: about 63°F
More about the weather here
Source: NOAA U.S. Climate Normals, hourly, 1991 to 2020, station USW00014943. Average dew points, not the stickiest days.