As of 10:48 PDT

Mill Plain, WA weather in September

59°

Mill Plain, Wednesday, 7 October, 10:48

Mostly clear. Feels like 59°. High 79°, low 50°.

Pressure30.06 inHg

Wind6.9 mph N

Humidity77%

Visibility1.2 mi

Dew point52°

See detailed hourly forecast

In September, Mill Plain, WA averages a high of 73.1° and a low of 52.8°. About 3.5 inches of precipitation fall over the month (8 wet days). The record high is 102.2° (2017) and the record low 35.8° (1972). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	76.5°	55°	23%	95° (1988)	44.6° (2021)
2	77.4°	54.9°	20%	101.5° (1988)	46.6° (1960)
3	76.8°	55.6°	18%	96.8° (1988)	44.1° (1975)
4	77°	55.2°	20%	102.2° (2017)	45.9° (2000)
5	76.3°	55°	20%	96.1° (2024)	46.9° (1969)
6	75.7°	54.9°	23%	92.1° (1993)	45.3° (1969)
7	75.9°	54.9°	18%	95.4° (2011)	43.3° (1960)
8	75°	54°	22%	90° (1963)	45.3° (1976)
9	75.2°	54.1°	22%	93.6° (1963)	41.2° (1970)
10	75.6°	54.5°	23%	95.5° (2011)	43° (1964)
11	75.2°	54°	23%	93.7° (2011)	45.9° (1999)
12	74.5°	53.8°	18%	87.6° (1975)	46.8° (2012)
13	75°	52.2°	18%	89.1° (1999)	41.7° (1970)
14	73.8°	53.2°	22%	90.3° (2023)	41.2° (1971)
15	72.9°	53.1°	20%	94.8° (1981)	43° (1969)
16	71.4°	52.7°	27%	89.4° (2008)	41° (2021)
17	70.3°	52.5°	38%	90.3° (2012)	43° (1965)
18	70.2°	52.7°	42%	89.8° (1991)	39.2° (1965)
19	69.8°	52°	42%	90.1° (1974)	40.1° (1983)
20	70.2°	51.3°	28%	90° (2014)	43.5° (1968)
21	71.4°	51.3°	27%	89.2° (1987)	40.8° (1993)
22	71.8°	51.3°	25%	92.1° (1987)	42.1° (1993)
23	71.2°	51.3°	22%	90.5° (1974)	41° (2000)
24	71.6°	51.1°	25%	91.4° (1974)	42.8° (1970)
25	70.3°	51.6°	38%	91.9° (1991)	38.5° (1972)
26	70.2°	51.1°	33%	87.6° (2022)	43.3° (1977)
27	70.9°	50.5°	25%	88.5° (2003)	35.8° (1972)
28	70.9°	50.9°	27%	86° (1993)	39.4° (1983)
29	70°	50.4°	33%	85.5° (1993)	37.8° (1983)
30	68.7°	50.2°	32%	88.9° (1987)	37.8° (2019)