Sisseton, SD

South Dakota · Records since 1931–2026

⛅ 87°F Feels like 90°
Currently in Sisseton
As of 1:30 PM CDT
🔥 6° below today's record of 93°F

Records for September 11

🔥 Record High

93°F

September 11, 1990

+17° from 76° normal

❄ Record Low

26°F

September 11, 1964

-24° from 50° normal
🌞 Normal high: 76°F 🌑 Normal low: 50°F 1991–2020 normals

All-Time Records — Sisseton

🔥
113°F
Hottest Day Ever
Jul 6, 1936
❄
-37°F
Coldest Day Ever
Jan 24, 1936
🌧
5.50"
Wettest Day Ever
May 27, 1954
☃
24.2"
Most Snow in One Day
Jan 4, 1997

First & Last Dates — Sisseton

How early and how late each seasonal turning point has ever arrived, across the full period of record

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Range ever recorded Normal date (1991–2020)
172 days
Longest growing season
2024
112 days
Shortest growing season
1935
147 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 93°F September 11, 1990
2 92°F September 11, 1952
3 92°F September 11, 1948
4 91°F September 11, 1981
5 89°F September 11, 2018
6 89°F September 11, 1998
7 89°F September 11, 1976
8 88°F September 11, 1978
9 88°F September 11, 1959
10 88°F September 11, 1936

Top 5 Record Lows — September 11

# Temp Date
🥶 26°F September 11, 1964
2 34°F September 11, 1984
3 34°F September 11, 1955
4 35°F September 11, 2020
5 36°F September 11, 2015
About this data — Records are sourced from the NOAA Threadex dataset via RCC ACIS, a quality-controlled record for long-term climate stations. Threadex adjusts for station relocations and observation-time changes, making records comparable across all years since 1931–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Sisseton

threshold: 92°F (90th percentile of historical Jun–Aug highs)
4.3
Avg heat wave length
days (historical)
99°
Avg peak temp
during heat waves
3
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1932–2026
18
2026 so far
19
Avg/year 1970–2025
16
Avg/year (last 10 complete)
65
Most in a year (1934)

Average 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

52
2026 total
above-normal nights
44.0
Avg / summer
1970–2020
67
Most in a summer
2022

Above-Normal Summer Nights Per Year

Average June–August Low by Decade

Overnight lows · complete decades only

Precipitation

Annual totals and trend across the full period of record · see this year's standing →

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1931–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1931, annual totals have trended +0.40" per decade, about +3.7" across the record.

Heavy Rain Days Per Year (≥ 1.0")

Compare year-to-year changes in days with heavy rainfall (≥ 1.0")

This Year — 2026

How Sisseton is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

143 of 253 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

15.53"
2026 YTD
Normal: 17.66"
-2.13"
0.02"
September so far
September normal: 2.45"
-2.43"
3
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Sisseton is 2.13" behind the normal pace

Period Review — Jun 1 – Aug 31, 2026

Any window, evaluated against every other year on record — 92 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
70.5°F
Average temperature
29th-warmest of 93
+1.6°
vs. average
Normal: 69.0°F (1991–2020)
10.39"
Precipitation
32nd-wettest of 83
+1.04"
vs. average
Normal: 9.35" · 111% of normal

Average Temperature by Year — Jun 1 – Aug 31

1932–2026 · 2026 highlighted · trend -0.06° per decade (cooling since 1932)

Precipitation by Year — Jun 1 – Aug 31

1932–2026 · 2026 highlighted · trend -0.03" per decade (drier since 1932)

Warmest Jun 1 – Aug 31 on Record

# Year Avg Temp
1 1976 74.6°F
2 1988 74.5°F
3 1983 74.0°F
4 1936 73.4°F
5 2022 73.4°F
6 1959 73.2°F
7 2021 72.9°F
8 1934 72.9°F
9 1970 72.7°F
10 1973 72.6°F

Coolest Jun 1 – Aug 31 on Record

# Year Avg Temp
1 1992 64.6°F
2 2004 65.0°F
3 1993 65.4°F
4 1951 65.5°F
5 2009 65.5°F
6 1945 66.5°F
7 1958 67.3°F
8 1942 67.5°F
9 1985 67.6°F
10 2014 67.7°F

Wettest Jun 1 – Aug 31 on Record

# Year Total
1 1993 15.68"
2 1941 15.34"
3 1948 14.28"
4 2025 13.70"
5 1991 13.56"
6 2005 13.19"
7 2014 12.59"
8 1939 12.49"
9 2019 12.48"
10 1944 12.38"

Driest Jun 1 – Aug 31 on Record

# Year Total
1 1976 2.79"
2 1952 4.47"
3 1987 4.81"
4 1936 5.01"
5 1969 5.17"
6 1973 5.29"
7 2012 5.99"
8 2020 6.04"
9 1933 6.14"
10 1970 6.19"
About this data. Pick any start and end date and this becomes the same kind of review as the Month and Fall tabs, just for exactly the window you asked for — the generalized version of the same engine, evaluated across every year on record. Average temperature is the mean of each day's (high + low) / 2; precipitation is the sum of daily totals. A year missing more than about a fifth of the window's days is excluded from the temperature ranking; any missing day excludes a year from the precipitation ranking, since an unreported day is unreported rain. Ranges that cross from December into January aren't supported yet. Normals are the 1991–2020 mean for the same window.
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