Duluth Weather: September
 |
Average Day Temperature: | 69.3°F |
|
Average Night Temperature: | 54.9°F |
|
Sea Water Temperature: | 63.7°F |
|
Number of Sunny Days: | 14 days |
| Sunshine Hours: | 11.7 - 13.3 hours | |
|
Number of Rainy Days: | 1 day |
| Precipitation Totals: | 0.7 in | |
| detailed information | ||
forecast
| Duluth |
Temperature
| Duluth |
Air Temperature in September, °F
The highest day temperature in September 2025 was 91°F. The lowest night temperature was 39°F. The average values for day and night temperatures during September were 66.5°F и 55.6°F respectivly.
Duluth Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for Duluth was 61.9°F. The maximum and minimum values were 59.2°F and 66.8°F respectively.
Most of the days in September are sunny but you can also expect cloudy and gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Duluth is 0.7 in.
The average wind speed in September is 7.2 mph. This value is relatively stable throughout the year.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Duluth in September is 7.5 hours.
Duluth on the Weather Map
| Chicago |  |
-2 |
| Hawaii | |
+78 |
| Honolulu | |
+78 |
| Houston | |
+44 |
| Las Vegas |  |
+40 |
| Los Angeles | |
+52 |
| Maui | |
+72 |
| Miami | |
+72 |
| Miami Beach |  |
+80 |
| New York | |
+18 |
| San Diego | |
+54 |
| San Francisco | |
+46 |
| Sarasota | |
+62 |
| Tampa | |
+62 |
| Washington | |
+28 |
| 0300 |  |
16°F | NE 9 mph |
| 0600 |  |
18°F | NE 6 mph |
| 0900 | |
12°F | NE 5 mph |
| 1200 | |
20°F | NE 7 mph |
| 1500 | |
22°F | E 8 mph |
| 1800 | |
22°F | E 9 mph |
| 2100 |  |
16°F | SE 12 mph |
| 0000 | |
12°F | SE 11 mph |