Sisseton, SD

South Dakota · Records since 1931–2026

☁️ 62°F
Currently in Sisseton
As of 9:15 PM CDT

Records for September 26

🔥 Record High

92°F

September 26, 1974

+23° from 69° normal

❄ Record Low

22°F

September 26, 1965

-22° from 44° normal
🌞 Normal high: 69°F 🌑 Normal low: 44°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 26

# Temp Date
🏆 92°F September 26, 1974
2 91°F September 26, 2021
3 91°F September 26, 1990
4 89°F September 26, 2024
5 88°F September 26, 1987
6 87°F September 26, 1979
7 86°F September 26, 1963
8 86°F September 26, 1952
9 85°F September 26, 2025
10 85°F September 26, 1997

Top 5 Record Lows — September 26

# Temp Date
🥶 22°F September 26, 1965
2 27°F September 26, 2012
3 27°F September 26, 1984
4 28°F September 26, 1939
5 29°F September 26, 1980
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

144 of 267 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

17.52"
2026 YTD
Normal: 18.86"
-1.34"
2.01"
September so far
September normal: 2.45"
-0.44"
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 1.34" behind the normal pace

Period Review — Sep 18 – Sep 25, 2026

Any window, evaluated against every other year on record — 8 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
59.4°F
Average temperature
34th-warmest of 91
+1.5°
vs. average
Normal: 57.8°F (1991–2020)

Average Temperature by Year — Sep 18 – Sep 25

1932–2026 · 2026 highlighted · trend +0.21° per decade (warming since 1932)

Precipitation by Year — Sep 18 – Sep 25

1932–2025 · 2026 highlighted · trend +0.06" per decade (wetter since 1932)

Warmest Sep 18 – Sep 25 on Record

# Year Avg Temp
1 2019 66.3°F
2 1958 66.1°F
3 1940 66.1°F
4 1935 65.9°F
5 2025 65.9°F
6 2008 65.3°F
7 1967 65.1°F
8 2024 64.9°F
9 2023 64.5°F
10 1933 64.4°F

Coolest Sep 18 – Sep 25 on Record

# Year Avg Temp
1 1942 45.9°F
2 1965 47.2°F
3 1995 47.5°F
4 2006 49.8°F
5 1991 50.5°F
6 2012 50.7°F
7 2000 52.0°F
8 1975 52.1°F
9 1957 52.4°F
10 1985 52.4°F
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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