Rapid City (SD) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Rapid City.
Climate overview of Rapid City
The climate in Rapid City, South Dakota, United States of America, is marked by large temperature swings across the seasons, ranging from 30°C (86°F) in July to 3°C (37°F) in December.
Annual rain/snowfall is moderate at around 516 mm (20 in), with May being the wettest month. The city also has a distinct dry season from November to March, with warm summers and cold winters.
Rapid City Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Rapid City - and find the best time to visit.
Monthly Temperature in Rapid City
In Rapid City, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a comfortable 30°C (86°F) in July. In December, the coolest month of the year, temperatures drop to a chilly 3°C (37°F).
At night, temperatures range from around 16°C (61°F) in July to -9°C (16°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Rapid City
On average, Rapid City receives a reasonable amount of rain/snowfall, with an annual precipitation of 516 mm (20 in). Rapid City can be quite wet during May, receiving approximately 112 mm (4.4 in) of precipitation over 14 rainy days.
In contrast, during the driest month (January), you will experience much drier conditions, with 6.6 mm (0.3 in) of precipitation spread across 6 snowy days. For more details, please visit our Rapid City Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Rapid City
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: June, August and September
- Warmest weather: July and August
- Fewest rainy days: January, September, November and December
- Wettest months: April, May, June, July and August, when rainfall is highest.
- Seasonal pattern: A distinct dry season from November to March, with warm summers and cold winters
- Coldest conditions: December, with freezing nights around -9°C (16°F).
Frequently asked questions about the climate in Rapid City
What is the best time to visit Rapid City?
June, August and September typically offer the most optimal weather in Rapid City. In contrast, January, February and December tend to have less optimal conditions. Rapid City has a distinct dry season from November to March, with warm summers and cold winters.
What temperatures can I expect in Rapid City?
Daytime highs range from 3°C (37°F) in December to 30°C (86°F) in July. Nighttime lows range from -9°C (16°F) to 16°C (61°F). Temperatures vary considerably through the year.
How much rain does Rapid City get?
Annual rainfall is around 516 mm (20 in). May is the wettest month with 112 mm (4.4 in), while January is the driest with 6.6 mm (0.3 in).
Rapid City 3-Day Forecast
Rapid City (SD) 3-Day Forecast
Rapid City on the map
Rapid City is highlighted - select any city to see its climate.
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