Summer temperatures · Iowa
How hot does Waterloo get in summer?
In a typical summer, June to August, Waterloo averages highs around 83°F and lows around 62°F.
About 15 days a year reach 90°F or hotter, and a day at 100°F comes along less than once a year. About 86 days a year get to 80°F or warmer. That makes it the 57th 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 47°F.
Waterloo averages about 15 days a year at 90°F or hotter, so a hot day here is an event rather than a lifestyle.
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 | 62°F |
| Days a year at 80°F or warmer | 86 |
| Days a year at 90°F or hotter | 15 |
| Days a year at 100°F or hotter | fewer than one |
| Average winter high, for comparison | 32°F |
Summer here is June to August. Counts are averages a year.
Cities with about the same summer
- Cleveland, Ohio: highs around 82°F, lows around 63°F
- Sioux City, Iowa: highs around 83°F, lows around 61°F
- Medford, Oregon: highs around 88°F, lows around 56°F
More about the weather here
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00094910.