Weather in St Louis in August 2025
- August is usually the hottest month of the year in St Louis;
Average weather
Average temperature in St Louis in August
Going from a maximum of +104°F during the day to a minimum of +57°F during the night, the temperature in August averages around +88°F.
The average maximum temperature goes down 12% by the end of the month, compared with the beginning of the month, from +86°F to +81°F.
Is St Louis warm or cold in August?
St Louis is typically hot in August.
Maximum temperatures go up compared to the previous month from +88°F to +88°F. The minimum temperature also goes down from +72°F to +68°F.
Make sure that you pack your summer linen and swimming costumes; it’s probably going to be hot.
August is the hottest month in St Louis, here is the comparison with other months:
Climate in St Louis in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +88°F | +88°F | +81°F | ||||
| Min. temperature | ||||||
| +52°F | +48°F | +36°F | ||||
| Max. temperature | ||||||
| +106°F | +104°F | +100°F | ||||
| Rainfall | ||||||
| 101 mm | 88 mm | 81 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 70% | 71% | 70% | ||||
| Air pressure | ||||||
| 1014 HPa | 1015 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 10 | 10 | 12 | ||||
| Cloudy days | ||||||
| 5 | 6 | 6 | ||||
| Rainy days | ||||||
| 15 | 14 | 12 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as good as in July. The temperature levels stay the same in the area of +88°F for average maximum temperature during the day. As August arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 101 mm to 88 mm. Humidity rises from 70% to 71%. The average wind speed doesn’t change much during August, staying around 2 m/s. The amount of sunny days stay about the same, averaging 10 sunny days during the month.
September brings much the same weather, it remains good.
Wind
The average wind speed is 2 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in St Louis is gradually increasing during August, going from 2 m/s to 2 m/s over the course of the month.
Rain
How was the weather last August in St Louis?
Climate Change Over the Years
The climate in St Louis in August has not changed that much over the last 43 years.
The average temperature was the lowest in 1979 (+64°F) and the highest in 2012 (+71°F). The driest year was 2007 with only 666 mm of rainfall, and the wettest year was 2020 with 1575 mm.
FAQ
Is August a good time to visit St Louis?
Can you sunbathe in St Louis in August?
Is St Louis rainy in August?
Is it sunny in St Louis in August?
Other cities in USA
Monthly weather in St Louis
Source of the data
For this page, we’ve looked at the typical weather in St Louis, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.