Boise, ID: May

31 May 2026: May 2026 averaged 63.7°F in Boise, ID, the warmest May since 2023, 8th warmest of 149.

May 2026

Mean temperature: 63.7°F; Warmest since 2023; 8th warmest of 149
Precipitation: 0.08 in; Driest since 2002; 9th driest of 149

A normal May in Boise, ID (1991 to 2020): a mean temperature of 60.2°F, between 55.5°F and 62.9°F in eight years of ten and 1.12 in of precipitation, between 0.27 in and 2.54 in in eight years of ten.

The mean temperature of every May in Boise, ID since 1878: 63.7°F in 2026; the highest is 65.4°F, in 1934.

Normal range, 55.5 to 62.9°F

Every year, ranked, as a table

Every May in Boise, ID from 1875 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	63.7	8	78.4	5	49	13	0.08	140	0
2025	62.3	14	75.4	23	49.1	11	0.81	95	0
2024	58.2	74	71	81	45.4	69	1.48	55	0
2023	65	2	77.5	8	52.5	1	1.43	57	0
2022	55.5	112	67.1	127	43.8	99	2.46	19	0
2021	59.5	53	72.4	59	46.7	48	0.77	97	0
2020	60.5	37	72.6	52	48.4	18	1.98	30	0
2019	59.8	47	71.2	77	48.4	18	3.98	6	0
2018	63.8	6	76.5	13	51.2	3	1.88	34	0
2017	59.7	48	72.5	55	46.9	42	0.74	99	0
2016	60.9	33	73.1	49	48.7	15	0.91	88	0
2015	62.1	17	74.2	38	50	7	1.50	53	0
2014	60.7	35	74.6	33	46.8	45	0.60	110	0
2013	61	29	74.2	38	47.8	29	0.75	98	0
2012	58.9	65	71.6	71	46.2	55	0.90	91	0
2011	55.5	112	66.9	129	44.1	93	1.81	36	0
2010	53.6	139	64.5	146	42.6	121	2.30	22	0
2009	61.6	21	74.9	28	48.3	21	0.98	81	0
2008	60.5	37	73.2	47	47.7	31	0.65	107	0
2007	62.5	13	76.6	12	48.3	21	0.23	133	0
2006	61	29	73.9	42	48	27	1.19	66	0
2005	59.4	55	70.4	90	48.4	18	3.96	7	0
2004	58.7	66	70.3	92	47.1	37	2.38	20	0
2003	58.7	66	70.9	84	46.6	49	1.35	59	0
2002	59.1	61	71.9	67	46.4	52	0.01	146	0
2001	61.4	23	75.7	21	47	40	0.27	131	0
2000	59.7	48	71.6	71	47.8	29	0.83	94	0
1999	55.7	110	68.9	106	42.6	121	1.10	70	0
1998	56.3	102	66.4	133	46.2	55	4.40	2	0
1997	62.9	11	76.5	13	49.3	8	1.14	67	0
1996	55.4	115	67.1	127	43.7	104	1.67	45	0
1995	56.9	93	69	102	44.7	79	2.36	21	0
1994	61	29	74.7	32	47.2	36	1.01	79	0
1993	63	10	76.8	10	49.3	8	0.92	86	0
1992	64.2	5	81.5	1	47	40	trace	149	0
1991	54.9	123	68.1	118	41.7	131	1.57	48	0
1990	55.6	111	68.3	114	43	117	4.07	4	0
1989	56.3	102	71.3	76	41.2	140	0.21	134	0
1988	57.9	77	72.4	59	43.4	110	1.33	62	0
1987	62.2	15	76.1	19	48.3	21	0.69	105	0
1986	59	63	73.2	47	44.9	76	1.10	70	0
1985	58.4	72	72.4	59	44.5	84	1.52	52	0
1984	54.8	127	66.5	132	43	117	1.06	74	0
1983	56.5	98	68.8	107	44.2	87	1.93	32	0
1982	54.8	127	69.2	99	40.5	143	0.39	123	0
1981	54.7	130	67.4	124	41.9	127	0.95	82	0
1980	57.2	90	68.5	111	45.9	60	3.77	8	0
1979	57.8	80	71.9	67	43.6	105	1.28	63	0
1978	54.3	134	67.2	126	41.4	136	0.36	126	0
1977	53.6	139	65.1	142	42.2	124	1.80	37	0
1976	59.2	60	74.6	33	43.9	97	0.46	121	0
1975	56.2	106	69	102	43.3	112	0.88	92	0
1974	55.4	115	68.8	107	42	125	0.10	137	0
1973	60.5	37	75.3	25	45.6	65	0.74	99	0
1972	60.6	36	74.9	28	46.3	53	0.32	129	0
1971	60	44	72.6	52	47.3	35	0.25	132	0
1970	57.5	85	70.5	88	44.5	84	0.73	102	0
1969	61	29	76.2	18	45.9	60	0.50	119	0
1968	57.8	80	71.6	71	44	95	0.40	122	0
1967	56.5	98	71.4	75	41.5	133	0.49	120	0
1966	61.4	23	77.2	9	45.7	64	0.32	129	0
1965	54.9	123	67.9	121	41.9	127	0.80	96	0
1964	55	119	68.7	109	41.4	136	1.76	40	0
1963	60.8	34	72.9	50	48.7	15	0.85	93	0
1962	56	108	68.1	118	43.8	99	2.90	11	0
1961	57.9	77	72.5	55	43.2	115	0.54	115	0
1960	54.4	132	68.4	112	40.5	143	1.21	65	0
1959	52.7	144	65.3	141	40.1	148	1.68	43	0
1958	64.3	4	78.2	6	50.4	5	2.05	29	0
1957	58.2	74	69.2	99	47.1	37	2.79	12	0
1956	59.4	55	72	65	46.9	42	2.18	24	0
1955	53.6	139	65.6	138	41.6	132	1.48	55	0
1954	59.9	45	75.2	26	44.6	82	0.95	82	0
1953	52.1	148	64.1	149	40.2	145	2.59	15	0
1952	57.6	84	71	81	44.1	93	1.08	73	0
1951	56.8	95	69.7	94	43.8	99	0.94	84	0
1950	54.1	135	67.9	121	40.2	145	1.27	64	0
1949	61.5	22	74.8	31	48.2	24	0.73	102	0
1948	56.3	102	69	102	43.6	105	0.91	88	0
1947	62.2	15	76.4	15	48.1	26	1.02	78	0
1946	57.7	82	71.1	79	44.2	87	0.55	114	0
1945	56.6	96	69.1	101	44.2	87	2.21	23	0
1944	58.6	69	72.3	62	44.8	78	0.36	126	0
1943	54	136	66.8	130	41.2	140	0.72	104	0
1942	53	143	64.2	148	41.8	130	4.00	5	0
1941	58.5	71	71	81	45.9	60	1.65	46	0
1940	61.3	26	76.3	17	46.3	53	0.09	139	0
1939	61.9	18	76	20	47.7	31	0.11	136	0
1938	56.2	106	68.3	114	44.2	87	2.55	17	0
1937	60.5	37	74.1	41	46.8	45	0.37	125	0
1936	62.8	12	76.4	15	49.2	10	0.69	105	0
1935	56.5	98	69.7	94	43.4	110	1.04	77	0
1934	65.4	1	79.5	2	51.3	2	0.10	137	0
1933	53.9	137	65	143	42.9	119	1.54	51	0
1932	58.4	72	69.6	96	47.1	37	1.92	33	0
1931	61.4	23	75.4	23	47.5	33	0.01	146	0
1930	55.9	109	67.3	125	44.4	86	1.68	43	0
1929	57.9	77	71.1	79	44.6	82	0.14	135	0
1928	64.7	3	78.6	4	50.7	4	0.01	146	0
1927	54.4	132	65.6	138	43.1	116	1.72	42	0
1926	58.7	66	72.1	64	45.3	70	1.09	72	0
1925	61.8	19	74.5	35	49.1	11	0.74	99	0
1924	63.8	6	78.9	3	48.8	14	0.05	144	0
1923	56.9	93	68.6	110	45.1	72	1.76	40	0
1922	56.3	102	69.4	98	43.3	112	1.56	50	0
1921	57.3	89	69	102	45.5	66	2.15	25	0
1920	55	119	68.4	112	41.5	133	0.56	113	0
1919	59.3	57	73.7	44	44.9	76	0.08	140	0
1918	54.8	127	68.1	118	41.5	133	1.05	76	0
1917	55	119	66.1	135	44	95	2.06	28	0
1916	52.5	146	64.8	145	40.2	145	1.80	37	0
1915	55	119	64.5	146	45.5	66	4.26	3	0
1914	61.2	28	74.9	28	47.5	33	0.51	117	0
1913	59	63	71.5	74	46.5	50	0.58	112	0
1912	56.5	98	68.2	117	44.7	79	1.94	31	0
1911	53.9	137	65	143	42.8	120	2.57	16	0
1910	59.9	45	72.8	51	46.9	42	1.14	67	0
1909	53.5	142	65.7	137	41.4	136	1.00	80	0
1908	52.6	145	63.3	151	41.9	127	1.38	58	0
1907	58	76	70.9	84	45.1	72	0.06	143	0
1906	55.3	117	66.6	131	43.9	97	2.77	13	0
1905	54.9	123	65.9	136	43.8	99	1.83	35	0
1904	58.6	69	71.8	70	45.5	66	0.02	145	0
1903	57.4	87	70.5	88	44.2	87	0.53	116	0
1902	57.5	85	70.1	93	45	75	1.12	69	0
1901	61.7	20	75.5	22	48	27	0.38	124	0
1900	59.7	48	72.6	52	46.8	45	2.54	18	0
1899	52.5	146	63.7	150	41.3	139	1.34	61	0
1898	56.6	96	72.3	62	41	142	0.64	108	0
1897	63.1	9	77.7	7	48.5	17	0.60	110	0
1896	50	149	60.3	152	39.8	149	4.92	1	0
1895	57.2	90	71.9	67	42.5	123	1.80	37	0
1894	59.3	57	72.5	55	46	58	2.08	27	0
1893	55.1	118	68.3	114	42	125	1.50	53	0
1892	55.5	112	67.7	123	43.3	112	3.51	9	0
1891	60.1	43	74.3	36	45.9	60	1.06	74	0
1890	60.2	42	74.2	38	46.2	55	1.64	47	0
1889	59.3	57	72	65	46.5	50	2.76	14	0
1888	59.5	53	73.9	42	45.1	72	0.94	84	0
1887	60.3	41	76.7	11	43.8	99	0.51	117	0
1886	59.1	61	73.5	45	44.7	79	0.61	109	0
1885	59.6	51	70.9	84	48.2	24	3.14	10	0
1884	61.3	26	72.5	55	50.1	6	0.91	88	0
1883	57	92	70.4	90	43.6	105	2.12	26	0
1882	57.7	82	71.2	77	44.2	87	0.34	128	0
1881	59.6	51	73.3	46	46	58	0.07	142	0
1880	54.6	131	65.6	138	43.5	108	1.57	48	0
1879	54.9	123	66.3	134	43.5	108	0.92	86	0
1878	57.4	87	69.6	96	45.3	70	1.35	59	0
1877			70.9	84					31
1876			74.3	36					31
1875			75	27					31

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1934	65.4
2023	65
1928	64.7
1958	64.3
1992	64.2
2018	63.8
1924	63.8
2026	63.7
1897	63.1
1993	63

Coldest
Year	Mean, °F
1896	50
1953	52.1
1916	52.5
1899	52.5
1908	52.6
1959	52.7
1942	53
1909	53.5
2010	53.6
1977	53.6
More years share the last value

Wettest
Year	Precipitation, in
1896	4.92
1998	4.40
1915	4.26
1990	4.07
1942	4.00
2019	3.98
2005	3.96
1980	3.77
1892	3.51
1885	3.14

Driest
Year	Precipitation, in
1992	trace
2002	0.01
1931	0.01
1928	0.01
1904	0.02
1924	0.05
1907	0.06
1881	0.07
2026	0.08
1919	0.08

The hottest, coldest and wettest days

Hottest day: 96°F; 12 May 2026
Coldest night: 38°F; 17 May 2026
Wettest day: 0.06 in; 26 May 2026

Every month, season and year

Months

Seasons

Years

Boise, ID the day's answers

All-time records

Every answer in words

May 2026 brought 0.08 in of precipitation in Boise, ID, the driest May since 2002, tied 9th driest of 149 (with 1919).
The hottest day of May 2026 in Boise, ID: 96°F on Tuesday 12 May 2026.
The coldest night of May 2026 in Boise, ID: a low of 38°F on Sunday 17 May 2026.
The wettest day of May 2026 in Boise, ID: 0.06 in on Tuesday 26 May 2026.