St. Louis weather in August
August in St. Louis averages 88°F by day and 69°F at night, with 3.4 inches of precipitation. It is the 2nd-warmest and 7th-wettest month of the year here.
- Average high
- 88°F-1° vs July
- Average low
- 69°F0 nights below freezing
- Precipitation
- 3.4 in5 days with 0.1 in. or more
- Snow
- 0.0 in13 days at 90°F+
Is August a good time to visit St. Louis?
August is hot. Average highs reach 88°F, with about 13 days at 90°F or more. The most comfortable months overall are June and September to October.
What to do in St. Louis in August
Mix it up: Gateway Arch, Missouri Botanical Garden, Gateway Arch National Park, Saint Louis Art Museum. All things to do in St. Louis.
On August 15 the sun rises at 6:15 am and sets at 7:54 pm, giving 13h 39m of daylight. Daylight all year.
What to pack for St. Louis in August
- Light, breathable clothes, a hat and sunscreen; carry water
Based on 30-year averages, not a forecast. Check the forecast a few days before you go.
August nearby
| City | Distance | High | Low | Precip. |
|---|---|---|---|---|
| St. Louis | 88°F | 69°F | 3.4 in | |
| O'Fallon, MO | 28 mi | 88°F | 69°F | 3.4 in |
| Springfield, IL | 84 mi | 85°F | 64°F | 3.4 in |
| Columbia, MO | 114 mi | 88°F | 67°F | 4.1 in |
| Bloomington, IL | 145 mi | 84°F | 61°F | 3.8 in |
| Champaign, IL | 148 mi | 84°F | 64°F | 3.5 in |
| Peoria, IL | 148 mi | 85°F | 64°F | 3.3 in |
Frequently asked questions
What is the weather like in St. Louis in August?
In August, St. Louis averages a high of 88°F and a low of 69°F, with 3.4 inches of precipitation (NOAA 1991-2020 normals).
Is August a good time to visit St. Louis?
August is hot in St. Louis, with average highs of 88°F. Plan outdoor time for mornings and evenings.
Does it snow in St. Louis in August?
Rarely. The August snowfall normal is under half an inch.
Before and after: St. Louis in July and St. Louis in September. All twelve months: St. Louis weather by month.
NOAA NCEI 1991-2020 climate normals, station St Louis Lambert Intl. Airport, MO, 9.8 miles from the city center.