Duluth, MN

Minnesota · Records since 1874–2026

🌙 57°F Feels like 54°
Currently in Duluth
As of 8:45 PM CDT

Records for September 26

🔥 Record High

81°F

September 26, 2024

+18° from 63° normal

❄ Record Low

23°F

September 26, 1965

-20° from 43° normal
🌞 Normal high: 63°F 🌑 Normal low: 43°F 1991–2020 normals

All-Time Records — Duluth

🔥
106°F
Hottest Day Ever
Jul 13, 1936
❄
-41°F
Coldest Day Ever
Jan 2, 1885
🌧
5.20"
Wettest Day Ever
Jul 21, 1909
☃
24.1"
Most Snow in One Day
Nov 1, 1991

First & Last Dates — Duluth

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)
195 days
Longest growing season
1894
85 days
Shortest growing season
1986
138 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 26

# Temp Date
🏆 81°F September 26, 2024
2 80°F September 26, 1923
3 79°F September 26, 2008
4 79°F September 26, 1938
5 78°F September 26, 1963
6 78°F September 26, 1894
7 77°F September 26, 2021
8 77°F September 26, 1990
9 76°F September 26, 2014
10 75°F September 26, 1974

Top 5 Record Lows — September 26

# Temp Date
🥶 23°F September 26, 1965
2 24°F September 26, 1985
3 27°F September 26, 1989
4 27°F September 26, 1980
5 28°F September 26, 1957
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 1874–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Duluth

threshold: 84°F (90th percentile of historical Jun–Aug highs)
3.8
Avg heat wave length
days (historical)
90°
Avg peak temp
during heat waves
4
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1874–2026
4
2026 so far
3
Avg/year 1970–2025
3
Avg/year (last 10 complete)
14
Most in a year (1936)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Duluth

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 1, 1930 – Aug 8, 1930 8 97°F (Aug 1) 91°F 65°F
2 Jul 1, 2020 – Jul 8, 2020 8 93°F (Jul 2) 88°F 62°F
3 Aug 1, 1878 – Aug 8, 1878 8 92°F (Aug 7) 87°F 66°F
4 Jul 7, 1936 – Jul 13, 1936 7 106°F (Jul 13) 99°F 71°F
5 Aug 22, 1969 – Aug 28, 1969 7 90°F (Aug 28) 86°F 58°F
6 Jul 4, 1988 – Jul 9, 1988 6 97°F (Jul 7) 90°F 63°F
7 Jul 23, 2006 – Jul 28, 2006 6 97°F (Jul 28) 88°F 62°F
8 Jul 12, 2006 – Jul 17, 2006 6 96°F (Jul 15) 89°F 64°F
9 Jun 8, 1956 – Jun 13, 1956 6 92°F (Jun 10) 89°F 59°F
10 Jul 11, 2012 – Jul 16, 2012 6 92°F (Jul 16) 88°F 64°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

Nights where the overnight low exceeded the 1991–2020 normal low

54
2026 total
above-normal nights
39.7
Avg / summer
1970–2020
67
Most in a summer
1878

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 (1871–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1871, annual totals have trended +0.18" per decade, about +2.7" 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 Duluth is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

22.90"
2026 YTD
Normal: 24.29"
-1.39"
3.34"
September so far
September normal: 3.48"
-0.14"
5
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Duluth is 1.39" behind the normal pace

Period Review — Aug 26 – Sep 25, 2026

Any window, evaluated against every other year on record — 31 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
60.7°F
Average temperature
29th-warmest of 153
+1.7°
vs. average
Normal: 59.0°F (1991–2020)

Average Temperature by Year — Aug 26 – Sep 25

1874–2026 · 2026 highlighted

Precipitation by Year — Aug 26 – Sep 25

1872–2025 · 2026 highlighted · trend +0.04" per decade (wetter since 1872)

Warmest Aug 26 – Sep 25 on Record

# Year Avg Temp
1 2024 64.9°F
2 1908 63.7°F
3 2015 63.2°F
4 1897 62.9°F
5 2009 62.7°F
6 2013 62.7°F
7 1948 62.4°F
8 1920 62.4°F
9 2018 62.2°F
10 1900 62.0°F

Coolest Aug 26 – Sep 25 on Record

# Year Avg Temp
1 1974 49.4°F
2 1965 50.0°F
3 1975 52.0°F
4 1956 52.5°F
5 1918 52.6°F
6 1986 53.0°F
7 1904 53.0°F
8 1993 53.4°F
9 1934 53.8°F
10 1907 53.9°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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