September 2021 Climate Summaries for the Northland

September 2021 was warmer than average, while precipitation totals for the month were generally above normal in most of northeast Minnesota and northwest Wisconsin.

September 2021 was a top 10 warmest September on record at Duluth, International Falls and Brainerd.

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>50% of days in September 2021 were warmer than average in Duluth, Minnesota.

Duluth, Minnesota Climate Summary for September 2021

Average temperature: 60.2 F
Normal: 57.2 F
Departure: +3.0 degrees above normal

Warmest temperature: 85 on the 19th
Lowest temperature: 39 on the 22nd

2 days had a high temperature of at least 80; normal is 2 days
17 days had a high temperature of at least 70; normal is 9 days

Total precipitation: 3.60″
Normal: 3.48″
Departure: +0.12″ above normal

Greatest calendar day precipitation total: 1.11″ on the 14th

11 days had at least 0.01″ of precipitation
8 days had at least 0.10″ of precipitation
4 days had at least 0.50″ of precipitation
1 day had at least 1.00″ of precipitation

Total snowfall: 0.0″
Normal: 0.1″
Departure: -0.1″ below normal

5 days with thunder

Note: September 2021 tied with September 1948 for 8th warmest September in station history. The warmest September on record was in 1897 with an average temperature of 62.6 degrees.
International Falls, Minnesota Climate Summary for September 2021

Average temperature: 59.0 F
Departure: +4.8 degrees above normal

Total precipitation: 3.23″
Departure: +0.23″ above normal

Total snowfall: 0.0″
Normal: 0.1″
Departure: -0.1″ below normal

4 days with thunder

Note: September 2021 tied with September 2015 for 6th warmest September on record in station history. The warmest September on record was in 1920 with an average temperature of 62.7 degrees.
Brainerd, Minnesota Climate Summary for September 2021

Average temperature: 62.3 F
Departure: +3.5 degrees above normal

Total precipitation: 3.29″
Departure: +0.69″ above normal

Note: September 2021 tied with September 2013, 2004 and 1998 for 3rd warmest September on record in station history. The warmest September on record was set in 1931 and 2009 with an average temperature of 63.6 degrees.
Hibbing, Minnesota Climate Summary for September 2021

Average temperature: 56.0 F
Departure: +3.0 degrees above normal

Total precipitation: 3.46″
Departure: +0.40″ above normal

4 days with thunder
Ashland, Wisconsin Climate Summary for September 2021

Average temperature: 59.7 F
Departure: +2.3 degrees above normal

Total precipitation: 2.85″
Departure: -0.18″ below normal

4 days with thunder
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Climate maps for September 2021

Total precipitation for the Northland in September 2021

Duluth, MN: 3.60″
Hibbing, MN: 3.46″
Brainerd, MN: 3.29″
International Falls, MN: 3.23″
Ashland, WI: 2.85″

Percent of normal precipitation values for the Northland in September 2021

Brainerd, MN: 127% of normal
Hibbing, MN: 113% of normal
International Falls, MN: 108%
Duluth, MN: 103% of normal
Ashland, WI: 94% of normal

Tim

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