United StatesAverage weather for Saint Louis in August
It's hot in August in Saint Louis with an average temperature of 31°C. Temperatures this month range from a low of 29°C to a high of 33°C. At night, you can expect temperatures between 19°C and 22°C.
Start of August
The month of August starts in Saint Louis with hot temps, averaging around 31°C during the day and nights around 20°C. There are plenty of days with a good chance of precipitation.
With the temperature difference between day and night, it’s smart to wear layers.
Mid August
By mid-August, daytime temps stay steady at around 31°C, with nights around 21°C. There’s a high chance of precipitation during this time.
End of August
By the end of August, the average daytime temperature in Saint Louis is around 32°C, while nighttime temps are about 21°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
In August, there is an average of 227 mm of precipitation, spread over 9 days. The wind speed is around 3 Bft, mostly coming from the South.
Saint Louis in August |
New York | ||
|---|---|---|---|
 Average temperature |
31°C | 30°C | |
 Max. temperature |
33°C | 31°C | |
| Min. temperature |
29°C | -5°C | |
 Total precipitation |
227 mm | 79 mm | |
| Rainy days |
9 days | 13 days | |
July
UV index
The UV index is a maximum of 7 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Is August a good time to visit Saint Louis?
Looking for sun? August isn’t a good month to be in Saint Louis. The temperature is nice, but there’s too much chance of rain.
Temperature records
With 40°C in 2023, Saint Louis reached the highest temperature in August over the past 10 years. The lowest daytime temperature in this month was 22°C in 2019. The extreme nighttime temperatures ranged from a lowest recorded value of 12°C to a highest value of 27°C.
Check out the climate of Saint Louis for all months and discover the best travel time
Daily Temperature in August in Saint Louis
This chart shows the average daily high and low temperatures in August for Saint Louis, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in August in Saint Louis
The chart below shows the average daily precipitation in August for Saint Louis, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for August, you can expect about 9 days of precipitation in Saint Louis.
Daily UV index in August in Saint Louis
This chart shows the average daily UV index in August in Saint Louis, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in August in Saint Louis over the years
This chart shows the average temperature in August in Saint Louis, measured in degrees Celsius, over the past few years.
Total precipitation in August in Saint Louis over the years
This chart shows the average precipitation in August in Saint Louis, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
Daily weather in August for Saint Louis
Click on any day in August to get detailed info about the usual weather on that day in Saint Louis. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in August in Saint Louis
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Average weather in Saint Louis by month
Click on a month below to see detailed weather info for Saint Louis. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of Saint Louis for all months at once
