Helena, MT: May

31 May 2026: May 2026 averaged 55.7°F in Helena, MT, the warmest May since 2025, 22nd warmest of 147.

May 2026

Mean temperature: 55.7°F; Warmest since 2025; 22nd warmest of 147
Precipitation: 1.82 in; Wettest since 2025; 64th wettest of 147

A normal May in Helena, MT (1991 to 2020): a mean temperature of 54°F, between 50.2°F and 57.3°F in eight years of ten and 1.95 in of precipitation, between 0.95 in and 2.84 in in eight years of ten.

The mean temperature of every May in Helena, MT since 1880: 55.7°F in 2026; the highest is 60.7°F, in 1958.

Normal range, 50.2 to 57.3°F

Every year, ranked, as a table

Every May in Helena, MT from 1880 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
2026	55.7	22	69.5	20	42	43	1.82	64
2025	57.4	10	70.9	12	43.8	15	3.64	10
2024	53	66	64.8	65	41.1	63	1.69	75
2023	60.5	2	73	4	48.1	2	1.21	105
2022	52.5	75	63.7	83	41.2	57	1.14	111
2021	51.9	84	64	80	39.8	93	2.26	40
2020	54.5	38	66.7	40	42.2	37	1.57	84
2019	52.3	79	63.4	88	41.2	57	2.44	30
2018	57.8	8	69.9	18	45.6	6	3.26	14
2017	56.2	15	70.4	15	42.1	39	1.39	92
2016	53.6	55	65.5	57	41.6	49	1.45	88
2015	54	46	65.3	60	42.7	27	2.36	35
2014	54.8	34	68.7	25	40.9	71	0.28	146
2013	54.4	41	66.6	44	42.2	37	2.04	55
2012	51.6	89	64.8	65	38.4	117	1.35	97
2011	50.7	107	61.4	113	40	88	2.81	23
2010	48.2	138	59.6	129	36.9	139	2.13	49
2009	55.4	25	69.5	20	41.3	51	0.43	140
2008	54	46	65.2	62	42.7	27	2.62	25
2007	56.2	15	69.4	22	43	22	3.25	15
2006	56.7	13	70.7	14	42.6	29	1.77	69
2005	52.4	76	64.4	72	40.4	81	2.11	50
2004	51.8	85	62.5	101	41.1	63	2.21	42
2003	53.2	61	65.3	60	41.2	57	1.25	101
2002	53.4	59	66	52	40.8	73	1.86	63
2001	59.2	5	74.5	2	43.8	15	1.23	103
2000	54.9	30	66.1	50	43.6	18	0.98	121
1999	50.2	112	63.1	92	37.3	136	2.19	45
1998	53.9	51	68.5	26	39.2	102	2.27	39
1997	53.1	65	67.8	30	38.5	111	2.35	36
1996	48.2	138	59.9	122	36.5	143	2.42	31
1995	49.7	117	62.8	96	36.7	142	3.09	18
1994	56.2	15	69.4	22	43	22	1.23	103
1993	57.3	11	70.9	12	43.7	17	1.71	73
1992	57.5	9	73	4	41.9	45	0.64	136
1991	52.7	72	64.3	76	41.2	57	1.71	73
1990	51	101	63.4	88	38.5	111	1.54	85
1989	51.6	89	64.2	79	39.1	105	1.00	119
1988	55.4	25	70.1	17	40.8	73	1.82	64
1987	55.9	20	69.7	19	42.1	39	1.90	62
1986	53.6	55	67.5	33	39.6	97	0.83	130
1985	56.2	15	71	11	41.3	51	0.75	133
1984	52.8	69	65.2	62	40.4	81	1.03	117
1983	51.5	93	64.4	72	38.5	111	1.79	67
1982	50.9	103	63.1	92	38.6	109	1.77	69
1981	52.8	69	63.2	91	42.4	33	6.09	3
1980	55.4	25	67.8	30	43	22	4.32	5
1979	53.2	61	66.3	48	40	88	0.29	144
1978	53.2	61	64.4	72	42	43	1.20	106
1977	50.4	111	62.8	96	38	123	1.82	64
1976	54.1	44	68.2	27	40	88	0.87	126
1975	48.6	133	59.5	132	37.6	132	1.95	58
1974	48.6	133	59.8	125	37.4	134	2.07	53
1973	52.8	69	67.7	32	38	123	1.08	115
1972	50.9	103	63.6	86	38.2	121	0.77	132
1971	51.4	95	64.3	76	38.4	117	1.77	69
1970	51.5	93	64.4	72	38.5	111	1.20	106
1969	55.1	28	70.4	15	39.9	91	1.13	113
1968	49.5	120	61.7	109	37.4	134	1.62	81
1967	52.1	81	65.4	59	38.8	108	2.08	52
1966	56.5	14	72.6	6	40.4	81	0.43	140
1965	50	115	62.2	104	37.9	127	2.20	43
1964	51.6	89	64	80	39.3	100	3.52	12
1963	53.4	59	66.1	50	40.6	79	1.34	98
1962	51.7	87	62.6	99	40.8	73	3.77	8
1961	53.6	55	66	52	41.3	51	1.36	94
1960	50.5	110	63.3	90	37.7	131	0.94	123
1959	47.4	143	59.2	136	35.6	147	1.93	60
1958	60.7	1	75.2	1	46.1	3	1.34	98
1957	55	29	66.6	44	43.4	19	3.25	15
1956	54.2	43	65.7	55	42.6	29	1.28	100
1955	49.3	122	61.7	109	36.8	141	1.02	118
1954	52.6	74	65.8	54	39.5	99	1.17	109
1953	48.1	141	60.3	119	36	145	2.72	24
1952	52.9	67	64.7	69	41.1	63	2.16	47
1951	52.1	81	64.5	71	39.6	97	1.00	119
1950	48.4	137	61.1	115	35.7	146	1.36	94
1949	54.7	35	69.1	24	40.3	85	2.18	46
1948	52.4	76	63.7	83	41.1	63	2.58	26
1947	54.1	44	67.9	28	40.3	85	0.48	139
1946	50.2	112	61.9	106	38.5	111	2.40	33
1945	51.1	99	62.6	99	39.7	95	1.94	59
1944	53.5	58	67.2	37	39.9	91	1.79	67
1943	49	128	60.3	119	37.6	132	0.67	134
1942	48.5	136	59.9	122	37.2	137	2.35	36
1941	54.5	38	67.9	28	41.2	57	1.67	76
1940	57.1	12	72.1	7	42.1	39	1.37	93
1939	55.9	20	67.3	36	44.6	8	1.59	83
1938	50.1	114	59.4	134	40.9	71	3.65	9
1937	54.7	35	67.1	38	42.3	36	0.29	144
1936	58.9	6	71.9	8	45.9	5	0.89	124
1935	49.2	125	60.4	118	38	123	0.66	135
1934	59.6	4	73.1	3	46.1	3	0.34	143
1933	49.6	118	60.1	121	39.1	105	1.41	91
1932	53.7	53	64.8	65	42.6	29	1.16	110
1931	54	46	66.7	40	41.3	51	1.09	114
1930	52.4	76	63.7	83	41.1	63	0.80	131
1929	50.6	109	62.9	95	38.4	117	0.88	125
1928	58.1	7	71.5	10	44.6	8	0.24	147
1927	45.3	147	53.6	147	36.9	139	6.67	1
1926	53.7	53	64.3	76	43.1	21	2.48	29
1925	54.5	38	66.6	44	42.5	32	1.93	60
1924	53.9	51	66.5	47	41.3	51	0.87	126
1923	51.1	99	62.5	101	39.7	95	2.15	48
1922	50.8	105	61.3	114	40.4	81	1.63	80
1921	51.6	89	62	105	41.1	63	1.64	78
1920	49.3	122	59.6	129	39	107	2.56	27
1919	54.4	41	66.7	40	42.1	39	0.96	122
1918	48.6	133	59	138	38.2	121	1.36	94
1917	48.7	132	59.6	129	37.9	127	3.34	13
1916	47.1	145	57.7	142	36.5	143	2.93	22
1915	50.7	107	59.7	127	41.7	47	1.74	72
1914	52.9	67	64.8	65	41	69	2.30	38
1913	51.3	96	61.5	112	41.2	57	2.00	56
1912	51.3	96	61.9	106	40.7	77	4.03	7
1911	49.6	118	60.8	116	38.3	120	2.07	53
1910	54.9	30	67.5	33	42.4	33	1.43	89
1909	48.8	130	59.7	127	37.9	127	2.40	33
1908	49.1	126	58	141	40.1	87	6.19	2
1907	49.1	126	59.1	137	39.2	102	1.04	116
1906	48.8	130	58.5	140	39.2	102	2.96	20
1905	48.9	129	58.6	139	39.3	100	2.09	51
1904	51.7	87	61.8	108	41.7	47	1.20	106
1903	49.3	122	59.9	122	38.6	109	1.64	78
1902	52.7	72	62.5	101	42.9	26	3.61	11
1901	56.1	19	66.8	39	45.4	7	4.11	6
1900	55.5	24	66.3	48	44.6	8	3.22	17
1899	47.2	144	55.9	145	38.5	111	1.98	57
1898	49.4	121	57.5	143	41.3	51	4.88	4
1897	60.1	3	71.7	9	48.4	1	1.14	111
1896	46.6	146	55.4	146	37.8	130	2.25	41
1895	52.1	81	63.1	92	41	69	0.87	126
1894	54.9	30	65.7	55	44	12	1.66	77
1893	51.2	98	61.6	111	40.8	73	3.04	19
1892	47.7	142	57.5	143	38	123	1.54	85
1891	54.9	30	66.7	40	43	22	2.51	28
1890	54	46	63.6	86	44.3	11	1.43	89
1889	53.2	61	64	80	42.4	33	2.20	43
1888	51	101	60.5	117	41.5	50	2.96	20
1887	52.2	80	64.7	69	39.8	93	2.41	32
1886	55.6	23	67.4	35	43.9	13	0.40	142
1885	51.8	85	62.8	96	40.7	77	0.85	129
1884	54.7	35	65.5	57	43.9	13	0.63	137
1883	50	115	59.5	132	40.5	80	1.54	85
1882	50.8	105	59.8	125	41.8	46	0.54	138
1881	54	46	64.9	64	43.2	20	1.60	82
1880	48.2	138	59.3	135	37.2	137	1.24	102

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1958	60.7
2023	60.5
1897	60.1
1934	59.6
2001	59.2
1936	58.9
1928	58.1
2018	57.8
1992	57.5
2025	57.4

Coldest
Year	Mean, °F
1927	45.3
1896	46.6
1916	47.1
1899	47.2
1959	47.4
1892	47.7
1953	48.1
2010	48.2
1996	48.2
1880	48.2

Wettest
Year	Precipitation, in
1927	6.67
1908	6.19
1981	6.09
1898	4.88
1980	4.32
1901	4.11
1912	4.03
1962	3.77
1938	3.65
2025	3.64

Driest
Year	Precipitation, in
1928	0.24
2014	0.28
1979	0.29
1937	0.29
1934	0.34
1886	0.40
2009	0.43
1966	0.43
1947	0.48
1882	0.54

The hottest, coldest and wettest days

Hottest day: 90°F; 28 May 2026
Coldest night: 27°F; 6 May 2026
Wettest day: 0.97 in; 30 May 2026

Every month, season and year

Months

Seasons

Years

Helena, MT the day's answers

All-time records

Every answer in words

May 2026 brought 1.82 in of precipitation in Helena, MT, the wettest May since 2025, tied 64th wettest of 147 (with 1988 and 1977).
The hottest day of May 2026 in Helena, MT: 90°F on Thursday 28 May 2026.
The coldest night of May 2026 in Helena, MT: a low of 27°F on Wednesday 6 May 2026.
The wettest day of May 2026 in Helena, MT: 0.97 in on Saturday 30 May 2026.