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Merrill September Weather

Averages and records for weather in Merrill, Wisconsin in the month of September.

Typical Merrill September Weather 1991–2020
Average daily high	69.8 °F
Average daily low	46.3 °F
Average monthly precipitation	3.9 inches
Average monthly snow	none
Daily chance of precipitation	42.0%
Daily chance of snow	0%

Merrill September Weather Records 1905–2024
Highest temperature	97 °F	September 8, 1933
Lowest temperature	18 °F	September 22, 1974
Highest daily low	72 °F	September 1, 1937
Lowest daily high	42 °F	September 28, 1908
Hottest average high temperature	78.5 °F	1933
Coldest average high temperature	61.9 °F	1993
Most daily precipitation	4.6 inches	September 5, 2018
Most monthly precipitation	10.1 inches	1942
Most daily snow	0.6 inches	September 22, 1913
Most monthly snow	0.6 inches	1913

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	74.9	51.1	95	31
September 2	74.7	50.9	95	32
September 3	74.5	50.6	94	27
September 4	74.3	50.3	95	30
September 5	74.1	50.1	94	31
September 6	73.8	49.9	95	32
September 7	73.4	49.6	91	30
September 8	73.1	49.2	97	30
September 9	72.7	48.8	94	27
September 10	72.3	48.3	97	28
September 11	71.8	48.0	95	28
September 12	71.4	47.6	92	29
September 13	71.0	47.2	93	29
September 14	70.6	46.9	91	25
September 15	70.1	46.5	94	27
September 16	69.5	46.1	90	27
September 17	69.1	45.7	87	28
September 18	68.6	45.3	89	27
September 19	68.2	44.9	88	30
September 20	67.7	44.4	89	22
September 21	67.2	44.0	90	21
September 22	66.6	43.5	94	18
September 23	66.1	43.2	93	26
September 24	65.8	42.9	88	20
September 25	65.4	42.5	88	24
September 26	65.0	42.1	88	24
September 27	64.6	41.7	83	25
September 28	64.3	41.2	85	23
September 29	63.8	40.8	84	21
September 30	63.4	40.3	84	25

Weather Station Details

Years	Station	Coordinates
1905–2024	Merrill	location