Sioux Falls, SD 14-Day Forecast

South Dakota, United States 🇺🇸
91°
Sunny right now Today: high 94°, low 71°
Updated 5 hours ago

Sioux Falls weather for the next 14 days

Today

Sunny High 94° Low 71°
Precipitation
9% · 0.0 in
25 mph
6 - High
Sunrise / sunset
06:28 AM / 08:35 PM

Thursday, August 13

Partly Cloudy High 87° Low 64°
Precipitation
67% · 0.26 in
Max wind
15 mph
Humidity
69%
UV index
6 - Moderate
Sunrise / sunset
06:29 AM / 08:33 PM

Friday, August 14

Patchy rain nearby High 73° Low 65°
Precipitation
75% · 0.04 in
Max wind
12 mph
Humidity
93%
UV index
6 - High
Sunrise / sunset
06:30 AM / 08:32 PM

Saturday, August 15

Fog High 74° Low 68°
Precipitation
85% · 0.15 in
Max wind
10 mph
Humidity
96%
UV index
6 - Moderate
Sunrise / sunset
06:31 AM / 08:30 PM

Sunday, August 16

Sunny High 88° Low 60°
Precipitation
6% · 0.0 in
Max wind
10 mph
Humidity
61%
UV index
8 - Very High
Sunrise / sunset
06:32 AM / 08:29 PM

Monday, August 17

Sunny High 90° Low 63°
Precipitation
6% · 0.0 in
Max wind
14 mph
Humidity
66%
UV index
8 - Very High
Sunrise / sunset
06:34 AM / 08:27 PM

Tuesday, August 18

Sunny High 93° Low 66°
Precipitation
57% · 0.19 in
Max wind
12 mph
Humidity
64%
UV index
8 - Very High
Sunrise / sunset
06:35 AM / 08:26 PM

Wednesday, August 19

Sunny High 103° Low 66°
Precipitation
36% · 0.02 in
Max wind
16 mph
Humidity
65%
UV index
9 - Very High
Sunrise / sunset
06:36 AM / 08:24 PM

Thursday, August 20

Sunny High 87° Low 63°
Precipitation
7% · 0.0 in
Max wind
16 mph
Humidity
62%
UV index
8 - Very High
Sunrise / sunset
06:37 AM / 08:23 PM

Friday, August 21

Partly Cloudy High 79° Low 59°
Precipitation
47% · 0.04 in
Max wind
15 mph
Humidity
73%
UV index
7 - High
Sunrise / sunset
06:38 AM / 08:21 PM

Saturday, August 22

Sunny High 87° Low 54°
Precipitation
6% · 0.0 in
Max wind
10 mph
Humidity
67%
UV index
8 - Very High
Sunrise / sunset
06:39 AM / 08:19 PM

Sunday, August 23

Partly Cloudy High 66° Low 61°
Precipitation
74% · 0.08 in
Max wind
12 mph
Humidity
92%
UV index
5 - Moderate
Sunrise / sunset
06:40 AM / 08:18 PM

Monday, August 24

Overcast High 74° Low 60°
Precipitation
79% · 0.21 in
Max wind
10 mph
Humidity
79%
UV index
6 - High
Sunrise / sunset
06:41 AM / 08:16 PM

Tuesday, August 25

Sunny High 80° Low 59°
Precipitation
60% · 0.1 in
Max wind
9 mph
Humidity
75%
UV index
7 - High
Sunrise / sunset
06:42 AM / 08:14 PM

Sioux Falls 14-day outlook: the story

The warmest day of Sioux Falls's 14-day outlook is Wednesday, August 19 with a high near 103°F (40°C); the coolest night comes Saturday, August 22, dipping to 54°F (12°C). The trend points cooler: week two runs about 3°F below week one. Highs over the next two weeks average 86°F (30°C), about 5°F (3°C) above the typical August high of 81°F (27°C).

Precipitation is most likely on Thursday 13, Friday 14, Saturday 15, Tuesday 18 and beyond; the wettest day looks like Thursday, August 13 with about 0.26 in (6.6 mm) expected. For the weekend, expect Saturday 74°F (23°C) and fog / Sunday 88°F (31°C) and sunny.

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 7 of the next 14 days, peaking around Thursday, August 13.
What will be the warmest day in Sioux Falls over the next 14 days?
Wednesday, August 19, with a forecast high near 103°F (40°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

Monthly averages for Sioux Falls based on 2015–2024 weather data.
MonthHighLow Rain daysPrecipitation SunshineHumidity
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%
14-day forecasts nearby