September 2025 started off quite chilly, but the rest of the month brought consistent warmth. In Duluth, 20 out of 30 days had above-average temperatures, while only 8 days were cooler than usual.
*September 2025 was an exceptionally foggy month in Duluth, with fog recorded on 20 days, and 13 of those days had visibility reduced to 1/4 mile or less.
*September 2025 matched 2021, 2013, 2004, and 1998 as the 5th warmest September on record in Brainerd.
*September 2025 ranked as the ninth warmest September on record in Hibbing.
September 2025 was warmer than usual in northeast Minnesota and northwest Wisconsin.
Here are the average temperatures and deviations from the norm for September 2025.
Brainerd, MN: 62.3 degrees
Departure: +3.6 degrees above normal
Highest temperature: 88 on the 16th
Lowest temperature: 34 on the 7th
Ashland, WI: 59.6 degrees
Departure: +2.2 degrees above normal
Highest temperature: 85 on the 29th and 16th
Lowest temperature: 36 on the 8th
Duluth, MN: 59.1 degrees
Departure: +1.9 degrees above normal
Highest temperature: 85 on the 16th
Lowest temperature: 36 on the 6th
International Falls, MN: 58.2 degrees
Departure: +4.0 degrees above normal
Highest temperature: 83 on the 16th and 15th
Lowest temperature: 29 on the 7th
Hibbing, MN: 57.7 degrees
Departure: +4.7 degrees above normal
Highest temperature: 85 on the 16th
Lowest temperature: 29 on the 8th and 6th
In September 2025, precipitation patterns in the Northland were far more unpredictable compared to temperature trends.
Total Precipitation
Hibbing: 3.22 inches
Ashland: 3.07 inches
Duluth: 2.53 inches
Brainerd: 2.43 inches
International Falls: 1.40 inches
Precipitation anomalies in the Northland for September 2025.
International Falls: -1.60 inches below normal
Duluth: -0.95 inches below normal
Brainerd: -0.17 inches below normal
Ashland: +0.04 inches above normal
Hibbing: +0.16 inches above normal
Take a look at the daily precipitation for September 2025 in Duluth, Minnesota.
The first half of the month had frequent rain, peaking on the 2nd with 0.83 inches. The second half of September was much drier, with only 1 day of precipitation over 0.25 inches.
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