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United StatesThe weather in August in Rapid City
It's warm in August in Rapid City with an average temperature of 28°C. Temperatures this month range from a low of 26°C to a high of 31°C. At night, you can expect temperatures between 12°C and 18°C.
Looking for sun? August isn’t a good month to be in Rapid City. 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 Rapid City, South Dakota. 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 2021, Rapid City reached the highest temperature in August over the past 10 years. The lowest daytime temperature in this month was 15°C in 2015. The extreme nighttime temperatures ranged from a lowest recorded value of 4°C to a highest value of 22°C.
Rainfall amount
In August, there is an average of 208 mm of precipitation, spread over 18 days. The wind speed is around 5 Bft, mostly coming from the South.
Daily weather in August for Rapid City
Click on any day in August to get detailed info about the usual weather on that day in Rapid City. Check out the historical temperatures and precipitation over the past 10 years on this day.
August weather comparison
| Rapid City | New York | |
|---|---|---|
| Average temperature | 28°C | 30°C |
| Max. temperature | 31°C | 31°C |
| Min. temperature | 12°C | -5°C |
| Total precipitation | 208 mm | 79 mm |
| Rainy days | 18 days | 13 days |
Start of August
The month of August starts in Rapid City with hot temps, averaging around 30°C during the day and nights around 17°C.
Mid August
By mid-August, daytime temps drop to around 29°C, with nights around 15°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
End of August
By the end of August, the average daytime temperature in Rapid City is around 28°C, while nighttime temps are about 14°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
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UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Check out the climate of Rapid City for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in August in Rapid City, South Dakota. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in August in Rapid City
Temperature in August in Rapid City over the years
Precipitation charts
These charts show the average amount of precipitation in August in Rapid City, South Dakota. 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 Rapid City
Total precipitation in August in Rapid City over the years
Daily UV index in August in Rapid City
This chart shows the average daily UV index in August in Rapid City, 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 Rapid City
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Average weather in Rapid City by month
Click on a month below to see detailed weather info for Rapid City. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.