Rapid City Weather in August

Thinking of visiting Rapid City in August? Expect high temperatures reaching 29°C (84°F) during the day, dropping to 15°C (59°F) at night, and note that quite a bit of rainfall is likely.

Rainfall in Rapid City in August

Looking at the last 30 years, the data shows about 10 days with rain, averaging 62 mm (2.4 in) for the month. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.

Temperature in Rapid City in August

August is one of the better months to visit Rapid City. Expect 29°C (84°F) during the day and 15°C (59°F) at night. Conditions stay fairly consistent through the month, making it easier to plan what to wear. With overnight lows of 15°C (59°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. June, August and September typically offer the best weather for Rapid City.