St. Louis Weather in August

August in St. Louis averages 31°C (88°F) during the day and 20°C (68°F) at night. Quite a bit of rainfall is typical this month, with around 81 mm (3.2 in) on average. An umbrella is a good idea.

Rainfall in St. Louis in August

Looking at the last 30 years, the data shows about 8 days with rain, averaging 81 mm (3.2 in) for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in St. Louis in August

August in St. Louis sees highs of 31°C (88°F) and lows of 20°C (68°F) overnight. Mornings and evenings are often more comfortable than the peak afternoon hours. Nights are mild at around 20°C (68°F), which is comfortable for most people.

Sunshine in St. Louis in August

Expect sunny days throughout the month, with an estimated 268 hours of sunshine. This makes it a pleasant time to visit St. Louis.

If you prefer dry days with pleasant temperatures, October typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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For a detailed overview over the year and the best time to visit the United States of America, check out our St. Louis's climate page.

St. Louis Temperature in August

Min Temperature 20°C (68°F)  

Max Temperature 31°C (88°F)  

Chance of Rain 27%  

Precipitation 81 mm (3.2 in)  

Rainy days 8 days  

Humidity 70%  

Sunshine 268 hours  

Percentage Sunshine 64%  

What to Wear in St. Louis in August

Warm weather calls for comfortable, breathable clothing in August. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in St. Louis in August

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

8/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our St. Louis's climate page.

More climate data for St. Louis

Temperature Rainfall Sunshine Humidity

See the full St. Louis climate overview or explore weather in the United States of America.