Weathermondo.com
United StatesThe weather in August in Saint Louis
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.
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.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in August for Saint Louis, Missouri. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
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.
Rainfall amount
In August, there is an average of 227 mm of precipitation, spread over 21 days. The wind speed is around 3 Bft, mostly coming from the South.
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.
August weather comparison
| Saint Louis | New York | |
|---|---|---|
| Average temperature | 31°C | 30°C |
| Max. temperature | 33°C | 31°C |
| Min. temperature | 19°C | -5°C |
| Total precipitation | 227 mm | 79 mm |
| Rainy days | 21 days | 13 days |
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.
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.
Find affordable trips to Saint Louis
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.
Check out the climate of Saint Louis for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in August in Saint Louis, Missouri. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in August in Saint Louis
Temperature in August in Saint Louis over the years
Precipitation charts
These charts show the average amount of precipitation in August in Saint Louis, Missouri. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in August in Saint Louis
Total precipitation in August in Saint Louis over the years
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.
Weather experiences in August in Saint Louis
Have you been to Saint Louis in August?
Share your weather experience in August in Saint Louis.
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.