Summer temperatures · Minnesota
How hot does Duluth get in summer?
In a typical summer, June to August, Duluth averages highs around 75°F and lows around 54°F.
About 2 days a year reach 90°F or hotter, and 100°F doesn’t show up in a typical year. About 29 days a year get to 80°F or warmer. That makes it the 7th 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 44°F.
Duluth averages about 2 days a year at 90°F or hotter, because Lake Superior refuses to let summer get ideas above its station.
Live 48-hour forecast from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Summer at a glance
| Average summer high | 75°F |
|---|---|
| Average summer low | 54°F |
| Days a year at 80°F or warmer | 29 |
| Days a year at 90°F or hotter | 2 |
| Days a year at 100°F or hotter | none |
| Average winter high, for comparison | 23°F |
Summer here is June to August. Counts are averages a year.
Cities with about the same summer
- Great Falls, Montana: highs around 80°F, lows around 49°F
- Flagstaff, Arizona: highs around 80°F, lows around 48°F
- Missoula, Montana: highs around 81°F, lows around 49°F
More about the weather here
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00014913.