Rapid City, SD 14-Day Forecast
South Dakota, United States 🇺🇸
69°
Sunny right now
Today: high 71°, low 48°
Updated 1 min ago
Rapid City weather for the next 14 days
Wednesday, September 16
Overcast High 86° Low 55°Precipitation
38%
· 0.03 in
Max wind
19 mph
Humidity
41%
UV index
6 - Moderate
Sunrise / sunset
06:33 AM / 07:02 PM
Thursday, September 17
Overcast High 66° Low 56°Precipitation
74%
· 0.12 in
Max wind
10 mph
Humidity
73%
UV index
4 - Moderate
Sunrise / sunset
06:34 AM / 07:00 PM
Friday, September 18
Mist High 70° Low 58°Precipitation
73%
· 0.08 in
Max wind
9 mph
Humidity
85%
UV index
4 - Moderate
Sunrise / sunset
06:35 AM / 06:58 PM
Saturday, September 19
Light rain shower High 65° Low 58°Precipitation
88%
· 0.28 in
Max wind
9 mph
Humidity
87%
UV index
2 - Low
Sunrise / sunset
06:36 AM / 06:56 PM
Sunday, September 20
Light rain shower High 64° Low 55°Precipitation
88%
· 1.38 in
Max wind
7 mph
Humidity
83%
UV index
4 - Moderate
Sunrise / sunset
06:37 AM / 06:54 PM
Monday, September 21
Sunny High 70° Low 52°Precipitation
6%
· 0.0 in
Max wind
9 mph
Humidity
67%
UV index
6 - High
Sunrise / sunset
06:39 AM / 06:52 PM
Tuesday, September 22
Patchy rain nearby High 68° Low 52°Precipitation
58%
· 0.03 in
Max wind
11 mph
Humidity
83%
UV index
5 - Moderate
Sunrise / sunset
06:40 AM / 06:51 PM
Wednesday, September 23
Light rain shower High 56° Low 47°Precipitation
72%
· 0.22 in
Max wind
21 mph
Humidity
70%
UV index
4 - Moderate
Sunrise / sunset
06:41 AM / 06:49 PM
Thursday, September 24
Sunny High 72° Low 44°Precipitation
1%
· 0.0 in
Max wind
8 mph
Humidity
38%
UV index
6 - High
Sunrise / sunset
06:42 AM / 06:47 PM
Friday, September 25
Sunny High 60° Low 46°Precipitation
5%
· 0.0 in
Max wind
18 mph
Humidity
49%
UV index
5 - Moderate
Sunrise / sunset
06:43 AM / 06:45 PM
Saturday, September 26
Light rain shower High 45° Low 38°Precipitation
86%
· 0.32 in
Max wind
15 mph
Humidity
86%
UV index
2 - Low
Sunrise / sunset
06:44 AM / 06:43 PM
Sunday, September 27
Sunny High 57° Low 37°Precipitation
8%
· 0.0 in
Max wind
12 mph
Humidity
69%
UV index
4 - Moderate
Sunrise / sunset
06:46 AM / 06:41 PM
Monday, September 28
Sunny High 68° Low 44°Precipitation
3%
· 0.0 in
Max wind
14 mph
Humidity
60%
UV index
6 - High
Sunrise / sunset
06:47 AM / 06:39 PM
Rapid City 14-day outlook: the story
The warmest day of Rapid City's 14-day outlook is Wednesday, September 16 with a high near 86°F (30°C); the coolest night comes Sunday, September 27, dipping to 37°F (3°C). The trend points cooler: week two runs about 9°F below week one. Highs over the next two weeks average 70°F (21°C), about 6°F (3°C) below the typical September high of 76°F (25°C).
Precipitation is most likely on Thursday 17, Friday 18, Saturday 19, Sunday 20 and beyond; the wettest day looks like Sunday, September 20 with about 1.38 in (35.2 mm) expected. For the weekend, expect Saturday 65°F (18°C) and light rain shower / Sunday 64°F (18°C) and light rain shower.
For typical conditions month by month, see the Rapid City climate & average temperatures guide.
Rapid City forecast questions
Will it rain in Rapid City this week?
The forecast currently shows meaningful precipitation chances on 7 of the next 14 days, peaking around Sunday, September 20.
What will be the warmest day in Rapid City over the next 14 days?
Wednesday, September 16, with a forecast high near 86°F (30°C).
How accurate is a 14-day forecast for Rapid City?
Days 1-3 are highly reliable, days 4-7 capture the overall pattern well, and days 8-14 indicate trends rather than exact figures - check back as the date approaches; this page refreshes throughout the day.
Average temperatures in Rapid City by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 37° | 18° | 4 | 0.5 in | 7.2 h/day | 62% |
| February | 37° | 17° | 6 | 0.9 in | 8.2 h/day | 58% |
| March | 47° | 26° | 6 | 1.1 in | 9.3 h/day | 58% |
| April | 55° | 33° | 9 | 2.4 in | 10.2 h/day | 58% |
| May | 65° | 45° | 12 | 3.4 in | 10.9 h/day | 61% |
| June | 80° | 58° | 9 | 2.6 in | 13.1 h/day | 55% |
| July | 86° | 63° | 8 | 1.6 in | 13.5 h/day | 52% |
| August | 83° | 61° | 6 | 1.6 in | 12.6 h/day | 52% |
| September | 76° | 54° | 5 | 1.1 in | 10.6 h/day | 52% |
| October | 60° | 40° | 6 | 1.5 in | 8.9 h/day | 55% |
| November | 48° | 29° | 4 | 0.6 in | 7.7 h/day | 55% |
| December | 37° | 20° | 5 | 0.9 in | 6.8 h/day | 61% |
14-day forecasts nearby