United StatesAverage weather for Rapid City in August
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.
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. You can expect regular precipitation, but there will also be some sunny days in the early part of the month.
With the temperature difference between day and night, it’s smart to wear layers.
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.
Since it cools down at night, it’s a good idea to wear layers.
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.
Because temperatures drop in the evening, wearing layers is recommended.
In August, there is an average of 208 mm of precipitation, spread over 8 days. The wind speed is around 5 Bft, mostly coming from the South.
Rapid City in August |
New York | ||
|---|---|---|---|
 Average temperature |
28°C | 30°C | |
 Max. temperature |
31°C | 31°C | |
| Min. temperature |
26°C | -5°C | |
 Total precipitation |
208 mm | 79 mm | |
| Rainy days |
8 days | 13 days | |
July
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.
Is August a good time to visit Rapid City?
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.
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.
Check out the climate of Rapid City for all months and discover the best travel time
Daily Temperature in August in Rapid City
This chart shows the average daily high and low temperatures in August for Rapid City, 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 Rapid City
The chart below shows the average daily precipitation in August for Rapid City, 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 8 days of precipitation in Rapid City.
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.
Temperature in August in Rapid City over the years
This chart shows the average temperature in August in Rapid City, measured in degrees Celsius, over the past few years.
Total precipitation in August in Rapid City over the years
This chart shows the average precipitation in August in Rapid City, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
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.
Weather experiences in August in Rapid City
Have you been to Rapid City in August?
Share your weather experience in August in Rapid City.
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.
Or check out the climate of Rapid City for all months at once
