Sisseton, SD
South Dakota · Records since 1931–2026
Records for August 11
🔥 Record High
August 11, 1936
+20° from 82° normal❄ Record Low
August 11, 1990
-15° from 58° normalAll-Time Records — Sisseton
Top 10 Record Highs — August 11
| # | Temp | Date |
|---|---|---|
| 🏆 | 102°F | August 11, 1936 |
| 2 | 101°F | August 11, 1988 |
| 3 | 98°F | August 11, 2000 |
| 4 | 98°F | August 11, 1933 |
| 5 | 97°F | August 11, 1969 |
| 6 | 97°F | August 11, 1958 |
| 7 | 95°F | August 11, 1959 |
| 8 | 95°F | August 11, 1935 |
| 9 | 94°F | August 11, 1965 |
| 10 | 93°F | August 11, 1949 |
Top 5 Record Lows — August 11
| # | Temp | Date |
|---|---|---|
| 🥶 | 43°F | August 11, 1990 |
| 2 | 43°F | August 11, 1952 |
| 3 | 43°F | August 11, 1934 |
| 4 | 44°F | August 11, 1977 |
| 5 | 44°F | August 11, 1951 |
Heat Wave Summary — Sisseton
threshold: 92°F (90th percentile of historical Jun–Aug highs)2026 Daily High Temperature vs Normal
Year to date123 of 222 days with data were above the 1991–2020 normal high for their date.
Days ≥ 90°F Per Year
1932–2026Average Daily High by Decade
Full year · complete decades only
Longest Heat Waves — Sisseton
| # | Dates | Days | Peak | Avg High | Avg Overnight Low |
|---|---|---|---|---|---|
| 🏆 | Jul 4, 1936 – Jul 19, 1936 | 16 | 113°F (Jul 6) | 103°F | 69°F |
| 2 | Aug 17, 1976 – Aug 27, 1976 | 11 | 105°F (Aug 18) | 100°F | 68°F |
| 3 | Jul 20, 1941 – Jul 28, 1941 | 9 | 104°F (Jul 24) | 98°F | 73°F |
| 4 | May 26, 1934 – Jun 2, 1934 | 8 | 113°F (May 30) | 103°F | 63°F |
| 5 | Jul 17, 1934 – Jul 24, 1934 | 8 | 112°F (Jul 22) | 102°F | 70°F |
| 6 | Jul 14, 1932 – Jul 21, 1932 | 8 | 106°F (Jul 19) | 99°F | 68°F |
| 7 | Jul 17, 1940 – Jul 24, 1940 | 8 | 105°F (Jul 24) | 100°F | 69°F |
| 8 | Jul 26, 1988 – Aug 2, 1988 | 8 | 102°F (Jul 27) | 98°F | 69°F |
| 9 | Jun 3, 2021 – Jun 10, 2021 | 8 | 101°F (Jun 5) | 97°F | 67°F |
| 10 | Jul 16, 1974 – Jul 23, 1974 | 8 | 98°F (Jul 17) | 96°F | 66°F |
Heat Waves Per Year
Warm Summer Nights (Jun–Aug)
Nights where the overnight low exceeded the 1991–2020 normal low
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
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")
Month in Review — July 2026
Average temperature · July 2026
33rd-warmest month on record
23rd-warmest July of 90 on record
+3.4° vs. 71.1° average (1991–2020)Longest 90°F Streak in July
4 consecutive days with highs of at least 90°F (Jul 11–14, 2026, peaking at 93°F)
Ties the longest July streak since 2023 (3 years). The July record is 16 days, set in 1936.
Average July Temperature by Year
1932–2026 · 2026 highlighted
Warmest Julys on Record
| # | Year | Avg Temp |
|---|---|---|
| 1 | 1936 | 80.6°F |
| 2 | 1983 | 77.5°F |
| 3 | 1974 | 77.5°F |
| 4 | 1975 | 77.4°F |
| 5 | 1988 | 76.8°F |
| 6 | 1966 | 76.7°F |
| 7 | 1934 | 76.3°F |
| 8 | 1976 | 76.2°F |
| 9 | 1964 | 75.9°F |
| 10 | 1935 | 75.7°F |
Warmest Months on Record (Any Month)
| # | Month | Avg Temp |
|---|---|---|
| 1 | July 1936 | 80.6°F |
| 2 | July 1983 | 77.5°F |
| 3 | July 1974 | 77.5°F |
| 4 | July 1975 | 77.4°F |
| 5 | August 1983 | 77.1°F |
| 6 | July 1988 | 76.8°F |
| 7 | July 1966 | 76.7°F |
| 8 | July 1934 | 76.3°F |
| 9 | July 1976 | 76.2°F |
| 10 | August 1969 | 76.0°F |
Nearby Stations — July 2026
How the same month ranked at the closest reporting stations
| Station | Avg Temp | July Rank |
|---|---|---|
| Sisseton, SD | 74.5°F | 23rd of 90 |
| Aberdeen, SD | 75.6°F | 20th of 131 |
| Fargo, ND | 76.3°F | 3rd of 146 |
| Huron, SD | 78.1°F | 14th of 146 |
| Saint Cloud, MN | 75.2°F | 6th of 132 |