Sioux Falls, SD 14-Day Forecast
South Dakota, United States 🇺🇸
58°
Overcast right now
Today: high 63°, low 56°
Updated 6 min ago
Sioux Falls weather for the next 14 days
Thursday, September 17
Light rain shower High 71° Low 61°Precipitation
93%
· 0.38 in
Max wind
15 mph
Humidity
93%
UV index
3 - Low
Sunrise / sunset
07:08 AM / 07:34 PM
Friday, September 18
Patchy rain nearby High 82° Low 63°Precipitation
80%
· 0.17 in
Max wind
18 mph
Humidity
87%
UV index
6 - Moderate
Sunrise / sunset
07:09 AM / 07:32 PM
Saturday, September 19
Overcast High 68° Low 53°Precipitation
39%
· 0.0 in
Max wind
10 mph
Humidity
88%
UV index
2 - Low
Sunrise / sunset
07:10 AM / 07:30 PM
Sunday, September 20
Mist High 57° Low 52°Precipitation
92%
· 0.28 in
Max wind
8 mph
Humidity
95%
UV index
3 - Moderate
Sunrise / sunset
07:11 AM / 07:28 PM
Monday, September 21
Fog High 55° Low 51°Precipitation
88%
· 0.13 in
Max wind
7 mph
Humidity
96%
UV index
3 - Moderate
Sunrise / sunset
07:13 AM / 07:26 PM
Tuesday, September 22
Overcast High 68° Low 50°Precipitation
24%
· 0.0 in
Max wind
8 mph
Humidity
78%
UV index
6 - High
Sunrise / sunset
07:14 AM / 07:24 PM
Wednesday, September 23
Light rain shower High 64° Low 59°Precipitation
78%
· 0.17 in
Max wind
20 mph
Humidity
79%
UV index
4 - Moderate
Sunrise / sunset
07:15 AM / 07:23 PM
Thursday, September 24
Sunny High 63° Low 50°Precipitation
2%
· 0.0 in
Max wind
15 mph
Humidity
49%
UV index
5 - Moderate
Sunrise / sunset
07:16 AM / 07:21 PM
Friday, September 25
Sunny High 72° Low 50°Precipitation
2%
· 0.0 in
Max wind
13 mph
Humidity
53%
UV index
6 - High
Sunrise / sunset
07:17 AM / 07:19 PM
Saturday, September 26
Overcast High 79° Low 60°Precipitation
8%
· 0.0 in
Max wind
21 mph
Humidity
49%
UV index
7 - High
Sunrise / sunset
07:18 AM / 07:17 PM
Sunday, September 27
Overcast High 87° Low 69°Precipitation
9%
· 0.0 in
Max wind
21 mph
Humidity
36%
UV index
7 - High
Sunrise / sunset
07:19 AM / 07:15 PM
Monday, September 28
Sunny High 87° Low 56°Precipitation
4%
· 0.0 in
Max wind
22 mph
Humidity
37%
UV index
8 - Very High
Sunrise / sunset
07:20 AM / 07:13 PM
Tuesday, September 29
Sunny High 62° Low 46°Precipitation
4%
· 0.0 in
Max wind
19 mph
Humidity
55%
UV index
5 - Moderate
Sunrise / sunset
07:22 AM / 07:12 PM
Sioux Falls 14-day outlook: the story
The warmest day of Sioux Falls's 14-day outlook is Monday, September 28 with a high near 87°F (30°C); the coolest night comes Tuesday, September 29, dipping to 46°F (8°C). The trend points warmer: week two runs about 7°F above week one. Highs over the next two weeks average 66°F (19°C), about 10°F (6°C) below the typical September high of 76°F (24°C).
Precipitation is most likely on Thursday 17, Friday 18, Sunday 20, Monday 21 and beyond; the wettest day looks like Thursday, September 17 with about 0.38 in (9.6 mm) expected. For the weekend, expect Saturday 68°F (20°C) and overcast / Sunday 57°F (14°C) and mist.
For typical conditions month by month, see the Sioux Falls climate & average temperatures guide.
Sioux Falls forecast questions
Will it rain in Sioux Falls this week?
The forecast currently shows meaningful precipitation chances on 5 of the next 14 days, peaking around Thursday, September 17.
What will be the warmest day in Sioux Falls over the next 14 days?
Monday, September 28, with a forecast high near 87°F (30°C).
How accurate is a 14-day forecast for Sioux Falls?
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 Sioux Falls by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 27° | 11° | 5 | 1.0 in | 6.1 h/day | 75% |
| February | 31° | 13° | 5 | 0.9 in | 7.9 h/day | 66% |
| March | 45° | 26° | 6 | 2.2 in | 8.3 h/day | 66% |
| April | 56° | 36° | 10 | 3.6 in | 9.2 h/day | 62% |
| May | 69° | 49° | 12 | 4.3 in | 10.3 h/day | 65% |
| June | 81° | 62° | 10 | 4.0 in | 12.8 h/day | 64% |
| July | 83° | 65° | 7 | 2.6 in | 13.2 h/day | 70% |
| August | 81° | 63° | 9 | 3.2 in | 11.4 h/day | 72% |
| September | 76° | 58° | 8 | 2.7 in | 10.1 h/day | 67% |
| October | 59° | 42° | 7 | 2.5 in | 8.0 h/day | 64% |
| November | 45° | 29° | 5 | 1.5 in | 6.9 h/day | 68% |
| December | 33° | 18° | 6 | 1.5 in | 5.9 h/day | 73% |