Tomorrow in Rapid City looks
sunny, with a high of 58°
and an overnight low of 40°.
Rain is unlikely (6% chance).
Winds top out near 11 mph,
and the UV index reaches 2 (low).
Average conditions span from February lows near 17°F (-8°C) to July highs around 86°F (30°C). That 38°C (69°F) spread makes the time of year especially important.
Seasonal change
July highs reach 86°F (30°C), while February lows fall to 17°F (-8°C).
Typical day and night
Rapid City averages 59°F (15°C) by day and 39°F (4°C) at night across the year.
Rain and sunshine
About 466 mm (18.3 inches) falls across 81 wet days, with 9.9 hours of sunshine on an average day.
Yes - about 22 days a year carry measurable snowfall, concentrated October through May.
When does it rain most in Rapid City?
May, at 3.4 inches (87 mm) over about 12 days. January is the driest month, at 12 mm (0.5 in).
How much sun does Rapid City get?
9.9 hours a day averaged over the year, peaking in July at 13.5 hours.
What is the hottest month in Rapid City?
July, averaging 86°F (30°C) by day and 63°F (17°C) overnight. The hottest single day in our 2015-2024 record for this location reached 105°F (41°C).
When is Rapid City at its coldest?
February, with highs of 37°F (3°C) and lows near 17°F (-8°C). The coldest day in the 2015-2024 record fell to -21°F (-30°C).
When should I visit Rapid City?
August to October and May to June is the sweet spot for Rapid City - temperatures sit either side of the peak heat rather than in it. Expect 73°F (23°C) in the afternoon and around 8 days of rain in a typical month of it. For the same question asked the other way round, see where else is warm in August.
How much do temperatures drop at night in Rapid City?
By about 11°C on an average day - a wider day-to-night gap than most of the 3496 cities we track. In July that means 86°F (30°C) down to 63°F (17°C).