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Duluth September Weather

Averages and records for weather in Duluth, Minnesota in the month of September.

Typical Duluth September Weather 1991–2020
Average daily high	66.2 °F
Average daily low	47.4 °F
Average monthly precipitation	3.5 inches
Average monthly snow	0.1 inches
Daily chance of precipitation	38.6%
Daily chance of snow	0.34%

Duluth September Weather Records 1948–2024
Highest temperature	97 °F	September 3, 2023
Lowest temperature	23 °F	September 22, 1974
Highest daily low	71 °F	September 3, 2023
Lowest daily high	38 °F	September 30, 1985
Hottest average high temperature	72.6 °F	1948
Coldest average high temperature	56.5 °F	1965
Most daily precipitation	3.8 inches	September 20, 1972
Most monthly precipitation	10.4 inches	2023
Most daily snow	2.4 inches	September 18, 1991
Most monthly snow	2.4 inches	1991

Note: Daily averages are a moving average which includes 14 days before and after

Day	Average (°F)		Record (°F)
Day	High	Low	High	Low
September 1	71.5	52.3	87	30
September 2	71.3	52.1	92	34
September 3	71.1	51.9	97	32
September 4	70.8	51.6	89	37
September 5	70.6	51.4	88	34
September 6	70.2	51.1	91	33
September 7	69.8	50.7	95	30
September 8	69.4	50.3	87	32
September 9	68.9	49.8	90	33
September 10	68.5	49.5	84	34
September 11	68.0	49.1	86	31
September 12	67.7	48.7	87	29
September 13	67.3	48.4	84	30
September 14	66.9	48.0	80	30
September 15	66.4	47.6	79	27
September 16	66.0	47.2	89	30
September 17	65.6	46.8	85	28
September 18	65.1	46.4	84	28
September 19	64.6	45.9	90	27
September 20	64.1	45.4	83	23
September 21	63.4	45.0	80	28
September 22	63.0	44.5	81	23
September 23	62.6	44.2	83	29
September 24	62.3	43.9	81	26
September 25	61.9	43.5	81	27
September 26	61.4	43.1	79	23
September 27	61.1	42.7	83	27
September 28	60.8	42.4	81	24
September 29	60.3	42.0	77	25
September 30	59.8	41.6	79	26

Weather Station Details

Years	Station	Coordinates
1948–2024	Duluth	location