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Forest Grove September Weather

Averages and records for weather in Forest Grove, Oregon in the month of September.

Typical Forest Grove September Weather 1991–2020
Average daily high	77.4 °F
Average daily low	49.4 °F
Average monthly precipitation	1.3 inches
Average monthly snow	none
Daily chance of precipitation	18.4%
Daily chance of snow	0%

Forest Grove September Weather Records 1893–2024
Highest temperature	104 °F	September 3, 1988
Lowest temperature	27 °F	September 26, 1908
Highest daily low	65 °F	September 6, 1958
Lowest daily high	50 °F	September 23, 1934
Hottest average high temperature	86.7 °F	1974
Coldest average high temperature	68.4 °F	1978
Most daily precipitation	4.2 inches	September 30, 2013
Most monthly precipitation	6.6 inches	2013
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	80.9	51.9	103	35
September 2	80.6	51.7	99	37
September 3	80.2	51.6	104	39
September 4	79.8	51.4	99	39
September 5	79.5	51.2	101	38
September 6	79.2	51.0	100	38
September 7	79.0	50.9	98	36
September 8	78.8	50.7	100	36
September 9	78.7	50.6	98	35
September 10	78.4	50.4	96	35
September 11	78.2	50.2	96	32
September 12	77.9	50.0	98	33
September 13	77.7	49.8	92	32
September 14	77.6	49.6	97	36
September 15	77.5	49.4	96	34
September 16	77.3	49.3	97	37
September 17	77.1	49.2	94	30
September 18	76.7	49.0	97	30
September 19	76.3	48.8	97	32
September 20	75.9	48.6	96	35
September 21	75.5	48.4	96	33
September 22	75.2	48.1	96	34
September 23	74.8	47.9	96	33
September 24	74.4	47.6	96	29
September 25	74.0	47.4	96	27
September 26	73.5	47.1	93	27
September 27	72.9	46.8	95	32
September 28	72.4	46.5	95	30
September 29	72.0	46.3	89	33
September 30	71.6	46.0	94	30

Weather Station Details

Years	Station	Coordinates
1893–2024	Forest Grove	location