Summer temperatures · Missouri
How hot does St. Louis get in summer?
In a typical summer, June to August, St. Louis averages highs around 88°F and lows around 69°F.
About 47 days a year reach 90°F or hotter, and about 3 reach 100°F. About 126 days a year get to 80°F or warmer. That makes it the 39th hottest summer of the 129 US cities we track.
Last updated
The hottest high in the forecast for the next 48 hours is about 51°F.
St. Louis averages about 47 days a year at 90°F or hotter, and the stainless steel of the Gateway Arch is the last thing anyone wants to touch on 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 | 88°F |
|---|---|
| Average summer low | 69°F |
| Days a year at 80°F or warmer | 126 |
| Days a year at 90°F or hotter | 47 |
| Days a year at 100°F or hotter | 3 |
| Average winter high, for comparison | 44°F |
Summer here is June to August. Counts are averages a year.
Cities with about the same summer
- Raleigh, North Carolina: highs around 89°F, lows around 68°F
- Louisville, Kentucky: highs around 88°F, lows around 69°F
- Charlotte, North Carolina: highs around 89°F, lows around 68°F
More about the weather here
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00013994.