Sioux Falls, SD
South Dakota · Records since 1893–2026
☁️ 90°F
Feels like 94°
Currently in Sioux Falls
As of 8:00 PM CDT
Records for July 28
🔥 Record High
102°F
July 28, 1975
+17° from 85° normal❄ Record Low
44°F
July 28, 2013
-20° from 64° normal
🌞 Normal high: 85°F 🌑 Normal low: 64°F 1991–2020 normals
All-Time Records — Sioux Falls
110°F
Hottest Day Ever
Jun 21, 1988
-42°F
Coldest Day Ever
Feb 9, 1899
5.44"
Wettest Day Ever
Aug 7, 2022
18.1"
Most Snow in One Day
Mar 10, 1956
Top 10 Record Highs — July 28
| # | Temp | Date |
|---|---|---|
| 🏆 | 102°F | July 28, 1975 |
| 2 | 102°F | July 28, 1917 |
| 3 | 101°F | July 28, 2021 |
| 4 | 100°F | July 28, 1941 |
| 5 | 100°F | July 28, 1935 |
| 6 | 98°F | July 28, 2006 |
| 7 | 98°F | July 28, 1987 |
| 8 | 98°F | July 28, 1894 |
| 9 | 97°F | July 28, 1955 |
| 10 | 97°F | July 28, 1916 |
Top 5 Record Lows — July 28
| # | Temp | Date |
|---|---|---|
| 🥶 | 44°F | July 28, 2013 |
| 2 | 45°F | July 28, 1925 |
| 3 | 46°F | July 28, 1965 |
| 4 | 47°F | July 28, 1904 |
| 5 | 48°F | July 28, 1994 |
Heat Wave Summary — Sioux Falls
threshold: 93°F (90th percentile of historical Jun–Aug highs)4.4
Avg heat wave length
days (historical)
100°
Avg peak temp
during heat waves
9
Dangerous nights 2026
Overnights ≥ 70°F
0
Heat waves 2026
so far
2026 Daily High Temperature vs Normal
Year to date
Above normal
Below normal
119 of 207 days with data were above the 1991–2020 normal high for their date.
Days ≥ 90°F Per Year
1893–202612
2026 so far
23
Avg/year 1970–2025
23
Avg/year (last 10 complete)
66
Most in a year (1894)
Average Daily High by Decade
Full year · complete decades only
Longest Heat Waves — Sioux Falls
| # | Dates | Days | Peak | Avg High | Avg Overnight Low |
|---|---|---|---|---|---|
| 🏆 | Jul 2, 1936 – Jul 19, 1936 | 18 | 110°F (Jul 17) | 102°F | 73°F |
| 2 | Jun 17, 1910 – Jul 2, 1910 | 16 | 98°F (Jun 20) | 95°F | 66°F |
| 3 | Jul 13, 2012 – Jul 25, 2012 | 13 | 102°F (Jul 24) | 98°F | 72°F |
| 4 | Jul 17, 1940 – Jul 25, 1940 | 9 | 105°F (Jul 18) | 100°F | 71°F |
| 5 | Jul 28, 1955 – Aug 5, 1955 | 9 | 101°F (Jul 30) | 98°F | 73°F |
| 6 | Jul 16, 1974 – Jul 24, 1974 | 9 | 101°F (Jul 17) | 98°F | 70°F |
| 7 | Jul 25, 1987 – Aug 2, 1987 | 9 | 101°F (Jul 30) | 97°F | 72°F |
| 8 | Jul 26, 1988 – Aug 2, 1988 | 8 | 107°F (Jul 31) | 98°F | 69°F |
| 9 | Jun 28, 1966 – Jul 5, 1966 | 8 | 101°F (Jul 4) | 96°F | 70°F |
| 10 | Aug 13, 1972 – Aug 20, 1972 | 8 | 98°F (Aug 17) | 96°F | 72°F |
Heat Waves Per Year
Warm Summer Nights (Jun–Aug)
Nights where the overnight low exceeded the 1991–2020 normal low
34
2026 so far
above-normal nights
38.4
Avg / summer
1970–2020
66
Most in a summer
1936
Above-Normal Summer Nights Per Year
Average June–August Low by Decade
Overnight lows · complete decades only
Precipitation
Actual vs. 1991–2020 full-month and full-season normals
11.82"
2026 YTD
Normal: 16.94"
-5.12"
2.62"
July so far
July normal: 3.25"
-0.63"
4.36"
Summer so far
Summer normal: 10.82"
-6.46"
4
2026 heavy rain days
Days with ≥ 1.0"
Monthly Precipitation — Last 24 Months
Blue = actual · dashed line = monthly normal
Annual Precipitation Per Year (1970–2026)
Blue = above average · tan = below average · gold = 2026 (partial)
Heavy Rain Days Per Year (≥ 1.0")
Compare year-to-year changes in days with heavy rainfall (≥ 1.0")