Summer temperatures · South Dakota
How hot does Rapid City get in summer?
In a typical summer, June to August, Rapid City averages highs around 83°F and lows around 55°F.
About 32 days a year reach 90°F or hotter, and about 5 reach 100°F. About 86 days a year get to 80°F or warmer. That makes it the 25th 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 58°F.
Rapid City reaches 90°F on about 32 days a year, and the Black Hills spend those afternoons looking cooler than everything around them.
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 | 55°F |
| Days a year at 80°F or warmer | 86 |
| Days a year at 90°F or hotter | 32 |
| Days a year at 100°F or hotter | 5 |
| Average winter high, for comparison | 37°F |
Summer here is June to August. Counts are averages a year.
Cities with about the same summer
- Yakima, Washington: highs around 86°F, lows around 53°F
- San Jose, California: highs around 81°F, lows around 57°F
- Los Angeles, California: highs around 75°F, lows around 63°F
More about the weather here
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00024090.