Rainy days · South Dakota
How often does it rain in Rapid City?
Rapid City gets its rain mostly in spring, which the Black Hills accept with quiet dignity.
Rapid City gets measurable rain or snow on about 96 days a year, adding up to about 17 inches.
November usually brings Rapid City about 5 wet days and 0.4 inches. The wettest month is usually May, with about 13 wet days, and the driest is December, with about 5 wet days. That makes Rapid City number 98 of the 129 US cities we track, rainiest first.
Last updated
No rain in the forecast for the next 48 hours.
Live 48-hour check from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Rainy days, month by month
| Month | Wet days | Inches |
|---|---|---|
| January | 6 | 0.3 |
| February | 7 | 0.5 |
| March | 7 | 0.9 |
| April | 11 | 2.1 |
| May | 13 | 3.5 |
| June | 13 | 2.9 |
| July | 10 | 2.3 |
| August | 8 | 1.6 |
| September | 7 | 1.2 |
| October | 7 | 1.3 |
| November | 5 | 0.4 |
| December | 5 | 0.4 |
Cities with about as many rainy days
- Billings, Montana: about 97 wet days a year
- Lincoln, Nebraska: about 95 wet days a year
- Great Falls, Montana: about 98 wet days a year
Source: NOAA daily precipitation records for the Rapid City area, 1991 to 2020 (at least 30 complete years behind every month), via the Applied Climate Information System. A wet day here means at least a hundredth of an inch of rain or melted snow.