Boise October 21 Weather Records

Daily averages and all-time records for weather in Boise, Idaho for the date of October 21.

October 21 All-Time Records 1911–2024
Highest temperature	84 °F	2003
Lowest temperature	20 °F	1933
Lowest daily high	44 °F	1974
Highest daily low	52 °F	2021
Most precipitation	0.65 inches	1974
Most snow	0.1 inches	1935

October 21 All-Time Records
1911–2024

Highest temperature

84 °F

20 °F

44 °F

Highest daily low

52 °F

0.65 inches

0.1 inches

October 21 Average Weather 1991–2020 ¹
Average high	62.2 °F
Average low	39.0 °F
Chance precipitation	20.5%
Chance snow	0.6%

October 21 Average Weather
1991–2020 ¹

Average high

62.2 °F

Average low

39.0 °F

Chance precipitation

20.5%

Chance snow

0.6%

Boise October 21 Weather by Year

Year	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
2023	79	51	0.00	0.0
2022	70	48	0.17	0.0
2021	76	52	0.00	0.0
2020	63	40	0.00	0.0
2019	56	40	0.00	0.0
2018	69	44	0.00	0.0
2017	50	33	0.16	0.0
2016	70	40	0.00	0.0
2015	66	43	0.00	0.0
2014	60	46	0.30	0.0
2013	67	39	0.00	0.0
2012	57	31	0.00	0.0
2011	67	45	0.00	0.0
2010	71	43	0.00	0.0
2009	57	43	0.00	0.0
2008	53	35	0.00	0.0
2007	54	37	0.00	0.0
2006	57	32	0.00	0.0
2005	66	41	0.00	0.0
2004	56	38	0.00	0.0
2003	84	52	0.00	0.0
2002	65	46	0.00	0.0
2001	65	38	0.00	0.0
2000	51	38	0.14	0.0
1999	71	40	0.00	0.0
1998	66	37	0.00	0.0
1997	65	39	0.00	0.0
1996	50	23	0.00	0.0
1995	55	34	0.00	0.0
1994	65	40	0.00	0.0
1993	64	39	0.00	0.0
1992	68	45	0.00	0.0
1991	76	44	0.00	0.0
1990	61	36	0.12	0.0
1989	67	51	0.29	0.0
1988	76	45	0.00	0.0
1987	66	34	0.00	0.0
1986	65	37	0.00	0.0
1985	71	34	0.06	0.0
1984	48	28	0.00	0.0
1983	74	47	0.00	0.0
1982	71	39	0.00	0.0
1981	55	31	0.00	0.0
1980	62	39	0.00	0.0
1979	53	42	0.13	0.0
1978	62	38	0.00	0.0
1977	63	35	0.00	0.0
1976	63	29	0.00	0.0
1975	66	46	0.49	0.0
1974	44	39	0.65	0.0
1973	72	47	0.00	0.0
1972	62	46	0.00	0.0
1971	55	30	0.00	0.0
1970	53	39	0.00	0.0
1969	66	40	0.00	0.0
1968	57	34	0.00	0.0
1967	68	44	0.04	0.0
1966	49	29	0.00	0.0
1965	65	37	0.00	0.0
1964	65	35	0.00	0.0
1963	64	50	0.00	0.0
1962	69	41	0.00	0.0
1961	45	31	0.00	0.0
1960	68	44	0.00	0.0
1959	57	34	0.00	0.0
1958	58	25	0.00	0.0
1957	63	34	0.00	0.0
1956	55	31	0.00	0.0
1955	66	46	0.01	0.0
1954	77	39	0.00	0.0
1953	52	32	0.00	0.0
1952	71	43	0.00	0.0
1951	48	33	0.00	0.0
1950	69	41	0.00	0.0
1949	56	26	0.00	0.0
1948	68	36	0.00	0.0
1947	54	35	0.13	0.0
1946	61	47	0.16	0.0
1945	58	24	0.01	0.0
1944	62	41	0.00	0.0
1943	50	36	0.22	0.0
1942	69	41	0.00	0.0
1941	63	44	0.00	0.0
1940	64	44	0.01	0.0
1939	71	42	0.00	0.0
1938	63	42	0.00	0.0
1937	69	36	0.00	0.0
1936	60	32	0.00	0.0
1935	48	27	0.07	0.1
1934	70	49	0.06	0.0
1933	53	20	0.00	0.0
1932	65	26	0.00	0.0
1931	68	26	0.00	n/a
1930	65	30	0.00	n/a
1929	70	27	0.00	0.0
1928	65	22	0.00	0.0
1927	79	34	0.00	0.0
1926	70	30	0.00	0.0
1925	70	35	0.00	0.0
1924	73	43	0.00	0.0
1923	72	43	0.00	0.0
1922	63	35	0.00	0.0
1921	65	33	0.00	0.0
1920	51	32	0.08	0.0
1919	67	38	0.00	0.0
1918	63	35	0.00	0.0
1917	68	25	0.00	0.0
1916	64	27	0.00	0.0
1915	84	44	0.00	0.0
1914	59	46	0.01	0.0
1913	65	38	0.00	0.0
1912	59	20	0.00	0.0
1911	60	22	0.00	0.0

What's the all-time high for Boise on 10/21?

For the date of Oct 21, the highest temperature ever reached in Boise history is 84 °F which has happened 2 times, most recently in 2003.

Highest Temperatures in Boise on October 21

Rank	Temperature	Year
1	84 °F	1915
1	84 °F	2003
3	79 °F	1927
3	79 °F	2023
5	77 °F	1954
6	76 °F	2021
6	76 °F	1991
6	76 °F	1988
9	74 °F	1983
10	73 °F	1924

What's the all-time low for Boise on 10/21?

For the date of Oct 21, the lowest temperature ever reached in Boise history is 20 °F which has happened 2 times, most recently in 1933.

Lowest Temperatures in Boise on October 21

Rank	Temperature	Year
1	20 °F	1912
1	20 °F	1933
3	22 °F	1928
3	22 °F	1911
5	23 °F	1996
6	24 °F	1945
7	25 °F	1917
7	25 °F	1958
9	26 °F	1949
9	26 °F	1931
9	26 °F	1932

Lowest High Temperatures in Boise on October 21

Rank	Temperature	Year
1	44 °F	1974
2	45 °F	1961
3	48 °F	1951
3	48 °F	1984
3	48 °F	1935
6	49 °F	1966
7	50 °F	1996
7	50 °F	2017
7	50 °F	1943
10	51 °F	2000
10	51 °F	1920

What's the most it has ever rained in Boise on 10/21?

For the date of Oct 21, the most precipitation ever recorded in Boise history is 0.65 inches which happened in 1974.

All-Time Most Precipitation in Boise on October 21

Rank	Precipitation	Year
1	0.65 inches	1974
2	0.49 inches	1975
3	0.30 inches	2014
4	0.29 inches	1989
5	0.22 inches	1943
6	0.17 inches	2022
7	0.16 inches	1946
7	0.16 inches	2017
9	0.14 inches	2000
10	0.13 inches	1947
10	0.13 inches	1979

All-Time Most Snow in Boise on October 21

Rank	Precipitation	Year
1	0.1 inches	1935

Weather Station Details

Years	Station	Coordinates
1940–2024		location
1911–1939	Meridian 1 W	location