Hilo, HI: September

30 September 2026: September 2026 averaged 77.8°F in Hilo, HI, the warmest September since 2020, tied 10th warmest of 77 (with 1992 and 1987).

September 2026

Mean temperature: 77.8°F; Warmest since 2020; 10th warmest of 77
Precipitation: 16.19 in; Wettest since 2015; 6th wettest of 77

A normal September in Hilo, HI (1991 to 2020): a mean temperature of 77.2°F, between 75.4°F and 79°F in eight years of ten and 7.95 in of precipitation, between 4.03 in and 17.80 in in eight years of ten.

The mean temperature of every September in Hilo, HI since 1950: 77.8°F in 2026; the highest is 80.7°F, in 2019.

Normal range, 75.4 to 79°F

Every year, ranked, as a table

Every September in Hilo, HI from 1950 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	77.8	10	83.6	43	72.1	3	16.19	6
2025	77.4	18	85.2	14	69.6	21	2.76	73
2024	77	27	84	39	70	15	6.75	45
2023	77.2	22	84.5	25	69.8	18	5.67	51
2022	77.1	25	84.9	21	69.4	24	4.84	59
2021	77	27	84.3	30	69.6	21	8.94	27
2020	79	4	86.6	5	71.4	5	8.79	28
2019	80.7	1	87.7	2	73.8	1	8.16	34
2018	79	4	86	8	71.9	4	5.70	49
2017	76.8	32	84.3	30	69.3	28	3.91	69
2016	77.5	14	84.3	30	70.7	11	10.74	17
2015	80	2	87.3	3	72.6	2	25.03	1
2014	79.4	3	87.9	1	71	7	4.04	66
2013	77.5	14	85.8	9	69.2	30	3.64	70
2012	75.4	58	83.1	53	67.7	60	4.88	58
2011	76.1	44	83.8	41	68.4	46	4.45	60
2010	75.5	55	83.2	49	67.7	60	2.75	74
2009	75	65	82.7	60	67.2	71	6.94	42
2008	75.4	58	83.6	43	67.3	67	4.27	61
2007	76.6	35	84.2	33	68.9	38	8.74	29
2006	75.7	50	82.7	60	68.7	43	9.52	21
2005	77.2	22	83.6	43	70.8	10	19.73	3
2004	77.9	8	86.3	7	69.4	24	5.69	50
2003	77.5	14	85.2	14	69.8	18	7.76	37
2002	76	47	83	57	69	36	8.14	35
2001	76.1	44	83.1	53	69.2	30	9.01	25
2000	75.4	58	82.1	69	68.6	44	9.20	24
1999	73.9	76	81.1	76	66.8	73	5.65	52
1998	74.4	74	81.3	73	67.6	64	10.76	16
1997	77.7	13	85.4	13	70	15	8.98	26
1996	77.4	18	85.5	11	69.4	24	7.03	41
1995	78.2	6	86.7	4	69.7	20	4.20	62
1994	78.1	7	85	19	71.2	6	21.82	2
1993	77.1	25	84.8	22	69.4	24	4.99	57
1992	77.8	10	84.5	25	71	7	17.59	5
1991	76.9	29	84.2	33	69.6	21	9.41	23
1990	77.2	22	84.2	33	70.2	14	18.47	4
1989	74.6	71	81.8	71	67.3	67	9.73	20
1988	76.6	35	84.2	33	69	36	11.30	15
1987	77.8	10	85.1	16	70.4	12	11.56	14
1986	77.9	8	84.8	22	71	7	14.36	7
1985	75.7	50	82.6	63	68.8	40	11.78	13
1984	75.4	58	83.1	53	67.7	60	4.05	65
1983	74.9	68	80.9	77	68.8	40	12.08	11
1982	76	47	82.2	67	69.9	17	9.92	19
1981	76.2	42	83.2	49	69.2	30	12.79	9
1980	75.7	50	83.1	53	68.3	48	13.70	8
1979	76.5	38	85.1	16	67.8	59	3.64	70
1978	76.2	42	83.2	49	69.1	34	5.44	54
1977	77.5	14	85.7	10	69.3	28	4.19	64
1976	76.9	29	85	19	68.8	40	5.31	55
1975	75.5	55	83.3	48	67.7	60	2.73	75
1974	77.3	21	86.5	6	68	55	1.59	77
1973	76.3	41	84.2	33	68.3	48	8.07	36
1972	76.4	39	84.4	29	68.3	48	5.20	56
1971	76.6	35	85.1	16	68.1	52	8.63	30
1970	74.8	70	83.4	47	66.2	75	5.61	53
1969	75	65	81.9	70	68.1	52	7.24	40
1968	76.8	32	84.5	25	69.1	34	8.53	31
1967	76.9	29	84.7	24	69.2	30	6.78	43
1966	77.4	18	84.5	25	70.3	13	8.37	32
1965	76.7	34	85.5	11	68	55	5.72	48
1964	75	65	82.3	65	67.6	64	12.62	10
1963	76	47	83.6	43	68.4	46	10.18	18
1962	74.5	72	81.8	71	67.3	67	9.49	22
1961	75.4	58	83.7	42	67.1	72	6.76	44
1960	75.7	50	83.2	49	68.1	52	12.00	12
1959	75.1	64	82.3	65	67.9	58	7.27	39
1958	75.6	54	82.6	63	68.6	44	7.41	38
1957	76.4	39	84	39	68.9	38	4.20	62
1956	74.5	72	83	57	66.1	76	4.03	67
1955	73.1	77	81.3	73	64.9	77	3.99	68
1954	75.5	55	82.7	60	68.3	48	8.22	33
1953	74.9	68	82.2	67	67.6	64	3.63	72
1952	74	75	81.3	73	66.7	74	5.86	47
1951	76.1	44	84.2	33	68	55	2.40	76
1950	75.2	63	83	57	67.3	67	6.01	46

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
2019	80.7
2015	80
2014	79.4
2020	79
2018	79
1995	78.2
1994	78.1
2004	77.9
1986	77.9
2026	77.8
More years share the last value

Coldest
Year	Mean, °F
1955	73.1
1999	73.9
1952	74
1998	74.4
1962	74.5
1956	74.5
1989	74.6
1970	74.8
1983	74.9
1953	74.9

Wettest
Year	Precipitation, in
2015	25.03
1994	21.82
2005	19.73
1990	18.47
1992	17.59
2026	16.19
1986	14.36
1980	13.70
1981	12.79
1964	12.62

Driest
Year	Precipitation, in
1974	1.59
1951	2.40
1975	2.73
2010	2.75
2025	2.76
1953	3.63
2013	3.64
1979	3.64
2017	3.91
1955	3.99

The hottest, coldest and wettest days

Hottest day: 89°F; 8 September 2026
Coldest night: 67°F; 28 September 2026
Wettest day: 1.79 in; 10 September 2026

Every month, season and year

Months

Seasons

Years

Hilo, HI the day's answers

All-time records

Every answer in words

September 2026 brought 16.19 in of precipitation in Hilo, HI, the wettest September since 2015, 6th wettest of 77.
The hottest day of September 2026 in Hilo, HI: 89°F on Tuesday 8 September 2026.
The coldest night of September 2026 in Hilo, HI: a low of 67°F on Monday 28 September 2026.
The wettest day of September 2026 in Hilo, HI: 1.79 in on Thursday 10 September 2026.