Humid cities · Iowa
How humid is Waterloo in summer?
Across June, July and August, the dew point in Waterloo averages about 61.7°F, which is sticky on the usual dew point scale.
July is the muggiest month, with the dew point averaging about 63.9°F. On NOAA’s hour by hour normals, about 190 hours, about 2% of the year, average a dew point of 65°F or more. That makes it the joint 54th 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 33°F, which is dry.
Waterloo averages a summer dew point of about 61.7°F, and July takes it to about 64. Iowa air, sticky and unbothered.
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 | 61.7°F |
|---|---|
| Muggiest month | July, 63.9°F |
| Hours a year at a 65°F dew point or more | 190 (2%) |
| 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
- Fort Wayne, Indiana: about 61.7°F
- Columbus, Ohio: about 61.8°F
- Dayton, Ohio: about 61.8°F
More about the weather here
Source: NOAA U.S. Climate Normals, hourly, 1991 to 2020, station USW00094910. Average dew points, not the stickiest days.