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Winthrop September Weather

Averages and records for weather in Winthrop, Washington in the month of September.

Typical Winthrop September Weather 1991–2020
Average daily high	77.5 °F
Average daily low	41.7 °F
Average monthly precipitation	0.4 inches
Average monthly snow	none
Daily chance of precipitation	14.2%
Daily chance of snow	0%

Winthrop September Weather Records 1906–2024
Highest temperature	100 °F	September 4, 1988
Lowest temperature	18 °F	September 29, 1983
Highest daily low	62 °F	September 13, 1987
Lowest daily high	46 °F	September 29, 2019
Hottest average high temperature	88.8 °F	1918
Coldest average high temperature	67.1 °F	1941
Most daily precipitation	1.4 inches	September 6, 2013
Most monthly precipitation	2.7 inches	1959
Most daily snow	none	-
Most monthly snow	none	-

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	82.1	45.8	97	31
September 2	81.7	45.5	98	32
September 3	81.3	45.3	100	30
September 4	81.0	45.0	100	32
September 5	80.6	44.8	98	30
September 6	80.2	44.5	95	30
September 7	79.9	44.2	95	28
September 8	79.6	43.9	95	27
September 9	79.4	43.6	95	29
September 10	79.1	43.3	96	29
September 11	78.8	43.1	96	27
September 12	78.5	42.8	95	26
September 13	78.1	42.4	95	21
September 14	77.9	42.1	94	27
September 15	77.6	41.8	93	26
September 16	77.4	41.6	94	26
September 17	77.1	41.3	96	26
September 18	76.6	41.0	96	28
September 19	76.1	40.7	93	24
September 20	75.7	40.4	92	24
September 21	75.3	40.1	91	27
September 22	75.0	39.7	91	27
September 23	74.6	39.4	91	24
September 24	74.1	39.1	91	20
September 25	73.6	38.8	96	22
September 26	73.0	38.5	89	22
September 27	72.4	38.2	91	22
September 28	71.8	37.9	91	20
September 29	71.2	37.6	89	18
September 30	70.7	37.2	87	21

Weather Station Details

Years	Station	Coordinates
1906–2024	Winthrop 1 WSW	location