< Previous Month Next Month >

Walla Walla September Weather

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

Typical Walla Walla September Weather 1991–2020
Average daily high	78.7 °F
Average daily low	53.6 °F
Average monthly precipitation	0.6 inches
Average monthly snow	none
Daily chance of precipitation	12.7%
Daily chance of snow	0%

Walla Walla September Weather Records 1949–2024
Highest temperature	104 °F	September 2, 1950
Lowest temperature	32 °F	September 29, 1985
Highest daily low	75 °F	September 5, 2003
Lowest daily high	46 °F	September 23, 1984
Hottest average high temperature	85.9 °F	1990
Coldest average high temperature	70.7 °F	1985
Most daily precipitation	1.7 inches	September 8, 2003
Most monthly precipitation	2.9 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	83.9	57.6	99	44
September 2	83.4	57.2	104	44
September 3	82.9	56.9	96	44
September 4	82.6	56.6	99	44
September 5	82.2	56.3	99	44
September 6	81.9	56.1	102	45
September 7	81.5	55.8	98	44
September 8	81.2	55.5	102	39
September 9	80.9	55.3	97	43
September 10	80.5	55.1	99	43
September 11	80.1	54.8	97	43
September 12	79.8	54.6	95	41
September 13	79.4	54.3	94	38
September 14	79.2	53.9	97	39
September 15	78.9	53.7	98	39
September 16	78.5	53.4	97	35
September 17	78.2	53.2	97	32
September 18	77.8	52.9	97	36
September 19	77.2	52.6	92	33
September 20	76.7	52.2	92	37
September 21	76.3	51.8	94	39
September 22	75.8	51.6	90	37
September 23	75.4	51.3	93	33
September 24	75.0	51.1	95	37
September 25	74.5	50.7	99	37
September 26	73.9	50.4	92	38
September 27	73.3	50.1	90	35
September 28	72.8	49.7	90	34
September 29	72.3	49.4	90	32
September 30	71.8	49.0	89	34

Weather Station Details

Years	Station	Coordinates
1949–2024	Walla Walla Regional Airport	location