Hillsboro, OR: September

30 September 2026: September 2026 averaged 60.9°F in Hillsboro, OR, the coldest September since 2018, tied 38th coldest of 97 (with 1988 and 1946).

September 2026

Mean temperature: 60.9°F; Coldest since 2018; 38th coldest of 97
Precipitation: 0.83 in; Driest since 2022; 32nd driest of 97

A normal September in Hillsboro, OR (1991 to 2020): a mean temperature of 61.7°F, between 59.9°F and 64.7°F in eight years of ten and 1.02 in of precipitation, between 0.21 in and 2.97 in in eight years of ten.

The mean temperature of every September in Hillsboro, OR since 1930: 60.9°F in 2026; the lowest is 56.5°F, in 1933.

Normal range, 59.9 to 64.7°F

Every year, ranked, as a table

Every September in Hillsboro, OR from 1930 to 2026, ranked: the mean temperature, the mean high and the mean low from the warmest, the precipitation from the wettest; a year missing more than a tenth of its days is not ranked.

Year	Mean, °F	Rank	High, °F	Rank	Low, °F	Rank	Precipitation, in	Rank	Days missing
2026	60.9	58	72.4	80	49.3	25	0.83	65	0
2025	65.4	2	78.7	24	52.1	4	1.36	42	0
2024	63.9	21	77.3	36	50.5	12	0.84	64	0
2023	62.4	38	74.5	60	50.2	15	2.21	24	0
2022	65.4	2	80.2	9	50.5	12	0.34	84	0
2021	62.2	39	76.5	42	48	37	3.12	7	0
2020	65.1	5	78	30	52.3	2	1.28	48	0
2019	61.3	52	71.5	87	51.1	8	3.08	8	0
2018	60.6	65	75.3	52	45.9	72	0.79	68	0
2017	64.7	9	78.3	27	51	9	1.39	40	0
2016	60.2	72	74.2	62	46.1	69	0.93	56	0
2015	60.4	67	74.1	66	46.7	60	0.86	62	0
2014	64.7	9	78.8	22	50.6	11	1.10	53	0
2013	62.5	36	72.2	82	52.7	1	6.27	1	0
2012	62.2	39	79.3	20	45.2	81	0.04	94	0
2011	64.6	12	79.4	18	49.8	18	0.26	87	0
2010	61.1	57	72.4	80	49.7	20	2.21	24	0
2009	62	42	76.1	45	47.9	40	1.51	36	0
2008	61.3	52	77.4	34	45.2	81	0.22	88	0
2007	57.8	93	71.4	88	44.3	91	1.73	30	0
2006	62.1	41	78.8	22	45.5	75	0.59	76	0
2005	58.8	88	73.7	69	43.9	93	1.36	42	0
2004	59.9	75	71.6	86	48.3	34	1.37	41	0
2003	64.1	19	78.5	25	49.7	20	0.94	55	0
2002	60.7	61	76.8	38	44.5	90	0.83	65	0
2001	61.2	56	76.3	43	46	70	0.79	68	0
2000	60.4	67	73.7	69	47	54	1.27	49	0
1999	60.1	74	78.1	29	42.1	97	0.14	89	0
1998	63.1	32	79.8	14	46.4	64	0.87	59	0
1997	63.7	22	76	46	51.9	5	3.15	6	1
1996	59.8	76	71.9	84	47.6	45	2.96	10	0
1995	64.5	15	76.6	41	52.3	2	1.57	34	0
1994	64.7	9	79.1	21	50	17	0.60	74	1
1993	63.4	24	80.1	10	46.8	58	trace	95	1
1992	60.2	72	74.2	62	46.2	68	1.21	52	0
1991	64.5	15	80.3	8	48.6	33	0.39	82	0
1990	64.6	12	77.8	32	51.5	6	0.58	77	0
1989	63.2	31	79.9	12	46.4	64	0.68	70	0
1988	60.9	58	77.2	37	44.7	89	0.85	63	0
1987	63.5	23	79.8	14	47.1	51	0.14	89	0
1986	59.3	84	71.3	89	47.3	47	2.37	19	0
1985	57.7	94	70.5	93	44.9	86	1.68	31	0
1984	59.7	80	73.6	71	45.7	74	1.36	42	1
1983	59	86	73	78	45	84	0.56	78	0
1982	60.7	61	73.2	75	48.3	34	3.46	3	0
1981	61.9	43	76.8	38	47	54	2.75	12	0
1980	60.3	69	75.2	55	45.3	80	1.51	36	0
1979	63.3	27	76.8	38	49.8	18	2.56	18	1
1978	59.8	76	70.1	95	49.5	22	3.23	5	0
1977	60.3	69	71	91	49.5	22	3.43	4	1
1976	62.5	36	75.9	48	49.2	26	0.95	54	0
1975	63.4	24	80.4	7	46.3	66	0.00	97	0
1974	65.1	5	82.2	3	48	37	0.05	92	0
1973	61.7	46	75.6	51	47.9	40	2.75	12	1
1972	58.9	87	71.8	85	45.9	72	3.01	9	0
1971	59.6	82	72.5	79	46.7	60	2.32	20	0
1970	58	92	71.2	90	44.8	88	0.92	58	0
1969	61.3	52	73.5	72	49.1	28	2.16	26	0
1968	60.7	61	73.5	72	47.9	40	2.28	22	0
1967	64.6	12	82.2	3	47	54	0.40	81	1
1966	61.3	52	74.9	57	47.6	45	1.49	39	0
1965	58.2	91	73.9	68	42.5	95	trace	95	0
1964	57.2	96	72	83	42.5	95	0.60	74	0
1963	65	7	79.7	17	50.2	15	0.93	56	1
1962	61.7	46	74.6	59	48	37	1.67	32	2
1961	59.7	80	74.4	61	45.4	78	0.31	85	1
1960	63.1	32	77.9	31	48.3	34	0.61	73	1
1959	59.3	84	70.7	92	47.7	44	2.01	28	1
1958	62.7	35	75	56	50.4	14	0.87	59	0
1957	66.6	1	82	5	51.2	7	0.63	71	1
1956	61.6	50	74.2	62	49	30	1.54	35	0
1955	61.7	46	76	46	47.3	47	2.05	27	0
1954	60.3	69	73.5	72	47.1	51	1.29	47	0
1953	63.4	24	77.4	34	49.5	22	0.87	59	1
1952	65.2	4	83.5	1	47	54	0.29	86	2
1951	64	20	80.1	10	47.8	43	2.28	22	0
1950	63.3	27	79.8	14	46.8	58	1.25	50	0
1949	65	7	81.4	6	48.7	31	0.54	79	1
1948	60.6	65	75.7	50	45.5	75	2.57	17	0
1947	61.9	43	78.3	27	45.5	75	0.82	67	0
1946	60.9	58	75.3	52	46.5	63	1.80	29	0
1945	58.5	90	73.2	75	43.7	94	3.68	2	0
1944	63.3	27	79.4	18	47.1	51	2.60	16	0
1943	64.5	15	83	2	46	70	0.37	83	0
1942	60.7	61	75.9	48	45.4	78	0.05	92	0
1941	57.6	95	68.6	96	46.7	60	2.79	11	0
1940	63	34	74.9	57	50.9	10	2.74	14	2
1939	61.7	46	76.2	44	47.2	49	0.44	80	0
1938	63.3	27	77.6	33	49.1	28	1.31	46	1
1937	61.5	51	74.2	62	48.7	31	1.51	36	0
1936	59.8	76	75.3	52	44.3	91	0.62	72	0
1935	61.9	43	78.5	25	45.2	81	1.34	45	0
1934	59.4	83	73.2	75	46.3	66	1.25	50	2
1933	56.5	97	68.1	97	44.9	86	2.30	21	0
1932	64.2	18	79.9	12	49.2	26	0.06	91	3
1931	58.7	89	70.4	94	47.2	49	2.66	15	1
1930	59.8	76	74.1	66	45	84	1.58	33	2

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1957	66.6
2025	65.4
2022	65.4
1952	65.2
2020	65.1
1974	65.1
1963	65
1949	65
2017	64.7
2014	64.7
More years share the last value

Coldest
Year	Mean, °F
1933	56.5
1964	57.2
1941	57.6
1985	57.7
2007	57.8
1970	58
1965	58.2
1945	58.5
1931	58.7
2005	58.8

Wettest
Year	Precipitation, in
2013	6.27
1945	3.68
1982	3.46
1977	3.43
1978	3.23
1997	3.15
2021	3.12
2019	3.08
1972	3.01
1996	2.96

Driest
Year	Precipitation, in
1975	0.00
1993	trace
1965	trace
2012	0.04
1974	0.05
1942	0.05
1932	0.06
1999	0.14
1987	0.14
2008	0.22

The hottest, coldest and wettest days

Hottest day: 89°F; 9 September 2026
Coldest night: 39°F; 28 September 2026
Wettest day: 0.17 in; 6 September 2026

Every month, season and year

Months

Seasons

Years

2025

Hillsboro, OR the day's answers

All-time records

Every answer in words

September 2026 brought 0.83 in of precipitation in Hillsboro, OR, the driest September since 2022, tied 32nd driest of 97 (with 2002).
The hottest day of September 2026 in Hillsboro, OR: 89°F on Wednesday 9 September 2026.
The coldest night of September 2026 in Hillsboro, OR: a low of 39°F on Monday 28 September 2026.
The wettest day of September 2026 in Hillsboro, OR: 0.17 in on Sunday 6 September 2026.