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Ephrata September Weather

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

Typical Ephrata September Weather 1991–2020
Average daily high	78.8 °F
Average daily low	50.9 °F
Average monthly precipitation	0.2 inches
Daily chance of precipitation	8.6%

Ephrata September Weather Records 1903–2024
Highest temperature	106 °F	September 3, 1988
Lowest temperature	20 °F	September 24, 1926
Highest daily low	76 °F	September 2, 1938
Lowest daily high	45 °F	September 29, 2019
Hottest average high temperature	86.9 °F	1938
Coldest average high temperature	69.2 °F	1921
Most daily precipitation	0.9 inches	September 26, 1948
Most monthly precipitation	1.7 inches	1907

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	83.7	55.3	100	41
September 2	83.3	55.0	102	42
September 3	82.9	54.7	106	39
September 4	82.5	54.3	102	40
September 5	82.1	54.0	98	45
September 6	81.8	53.8	98	41
September 7	81.5	53.4	98	37
September 8	81.2	53.1	98	38
September 9	80.8	52.8	98	33
September 10	80.5	52.5	99	38
September 11	80.2	52.2	99	40
September 12	79.8	51.9	97	28
September 13	79.5	51.6	98	31
September 14	79.2	51.3	97	34
September 15	79.0	51.0	98	35
September 16	78.7	50.8	98	38
September 17	78.3	50.6	98	34
September 18	77.9	50.2	99	29
September 19	77.4	49.9	97	33
September 20	76.9	49.5	98	34
September 21	76.5	49.1	94	36
September 22	76.2	48.7	96	35
September 23	75.7	48.5	92	28
September 24	75.3	48.1	93	20
September 25	74.8	47.8	93	29
September 26	74.2	47.4	90	29
September 27	73.5	47.0	94	35
September 28	73.0	46.5	94	34
September 29	72.5	46.2	88	30
September 30	72.0	45.9	89	31

Weather Station Details

Years	Station	Coordinates
1949–2024	Ephrata Municipal Airport	location
1903–1948	Ephrata	location