Hillsboro, OR: records

4 October 2026: The hottest day on record in Hillsboro, OR: 114°F on Monday 28 June 2021.

The record begins: 1929

All-time records

Hottest day: 114°F; 28 June 2021
Coldest night: -14°F; 21 January 1930
Wettest day: 3.40 in; 18 November 1996
Warmest night: 74°F; 12 August 1977
Coldest day: 14°F; 4 February 1989

Daily records by decade

New daily records set in Hillsboro, OR by decade since the 1950s: the most record highs, 91, came in the 1960s; the most record lows, 55, in the 1960s.

Record highs
Record lows

Every decade as a table

Decade	Record highs	Record lows	Years in the record
1920s	0	0	1
1930s	0	0	10
1940s	0	0	10
1950s	6	1	10
1960s	91	55	10
1970s	55	43	10
1980s	55	28	10
1990s	41	16	10
2000s	42	33	10
2010s	37	13	10
2020s	32	11	7

Records by month

Month	Highest	Lowest	Wettest day
January	69°F 28 January 1934	-14°F 21 January 1930	2.84 in 15 January 1974
February	70°F 29 February 1988, 28 February 1968	-9°F 2 February 1950	2.68 in 10 February 1949
March	83°F 28 March 1930	18°F 1 March 1960	1.87 in 30 March 1943
April	90°F 28 April 2023, 30 April 1998, 29 April 1957	20°F 16 April 1933	1.82 in 5 April 1991
May	100°F 29 May 1983	26°F 8 May 1935	1.17 in 13 May 1978
June	114°F 28 June 2021	30°F 1 June 1934	2.04 in 7 June 1985
July	108°F 21 July 2006, 19 July 1956	36°F 25 July 1930	1.25 in 19 July 1983
August	107°F 14 August 2023	30°F 30 August 1930	1.33 in 1 August 1985
September	103°F 3 September 1988	29°F 17 September 1965, 25 September 1934	1.73 in 28 September 2013
October	92°F 2 October 1987, 2 October 1952	20°F 31 October 2006, 31 October 2002	2.60 in 26 October 1994
November	78°F 1 November 1959	8°F 15 November 1955	3.40 in 18 November 1996
December	64°F 26 December 1980, 1 December 1951, 23 December 1950 and 1 more	-2°F 8 December 1972	3.31 in 27 December 1937

Streaks, months and years

Longest heat streak	10 days	22 July to 31 July 2018	A high of 90°F or above
Longest cold streak	15 days	9 January to 23 January 1930	A high of 32°F or below
Wettest month	14.83 in	December 1996
Driest month	0.00 in	July 2025	and 9 more
Wettest year	62.59 in	1996
Driest year	23.86 in	1985

Every record in words

The coldest night on record in Hillsboro, OR: a low of -14°F on Tuesday 21 January 1930.
The wettest day on record in Hillsboro, OR: 3.40 in on Monday 18 November 1996.
The warmest night on record in Hillsboro, OR: a low of 74°F on Friday 12 August 1977.
The coldest day on record in Hillsboro, OR: a high of 14°F on Saturday 4 February 1989.
The longest run of days with a high of 90°F or above in Hillsboro, OR: 10 days, from Sunday 22 July to Tuesday 31 July 2018.
The longest run of days with a high of 32°F or below in Hillsboro, OR: 15 days, from Thursday 9 January to Thursday 23 January 1930.
The wettest month on record in Hillsboro, OR: December 1996, with 14.83 in of precipitation.
The driest month on record in Hillsboro, OR: July 2025, with 0.00 in of precipitation (shared with 9 other months).
The wettest year on record in Hillsboro, OR: 1996, with 62.59 in of precipitation.
The driest year on record in Hillsboro, OR: 1985, with 23.86 in of precipitation.

Hillsboro, OR the day's answers