Islip, NY: Summer

31 August 2026: Summer 2026 averaged 73.6°F in Islip, NY, the warmest summer since 2025, tied 11th warmest of 63 (with 2018 and 2005).

Summer 2026

Mean temperature: 73.6°F; Warmest since 2025; 11th warmest of 63
Precipitation: 16.37 in; Wettest since 2014; 9th wettest of 63

A normal summer in Islip, NY (1991 to 2020): a mean temperature of 72.9°F, between 70.4°F and 74.5°F in eight years of ten and 10.64 in of precipitation, between 6.61 in and 17.09 in in eight years of ten.

The mean temperature of every summer in Islip, NY since 1964: 73.6°F in 2026; the highest is 74.8°F, in 2010.

Normal range, 70.4 to 74.5°F

Every year, ranked, as a table

Every summer in Islip, NY from 1964 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	73.6	11	81.9	12	65.3	15	16.37	9	0
2025	74.5	4	82.5	6	66.5	2	8.05	49	0
2024	74.3	7	82	11	66.5	2	11.49	27	0
2023	72.7	26	80.2	35	65.1	18	14.18	14	0
2022	74.7	2	83.1	3	66.3	4	4.75	60	0
2021	73.7	10	81.4	16	66.1	5	13.35	20	0
2020	74.6	3	82.4	8	66.7	1	9.96	35	0
2019	73.8	9	82.1	10	65.5	11	10.64	31	0
2018	73.6	11	81.6	13	65.5	11	12.94	23	0
2017	72.2	33	80.5	32	63.9	37	9.41	39	0
2016	74.5	4	83	4	66	7	5.25	57	0
2015	73.3	15	81.1	20	65.4	14	7.27	54	0
2014	72.5	30	80.8	26	64.3	32	18.82	3	0
2013	73.5	14	81.1	20	65.8	8	13.21	22	0
2012	73.3	15	81.6	13	65	21	18.54	4	0
2011	74	8	82.4	8	65.6	9	17.02	6	0
2010	74.8	1	83.4	1	66.1	5	7.67	51	0
2009	70.4	50	77.7	55	63.1	46	14.91	11	0
2008	72.9	21	81.4	16	64.5	26	10.04	34	0
2007	71.6	39	79.6	38	63.5	40	12.33	26	0
2006	72.9	21	80.4	33	65.3	15	16.51	8	0
2005	73.6	11	81.6	13	65.5	11	3.74	62	0
2004	70.2	53	77.9	51	62.4	52	8.71	45	0
2003	71.5	42	78.9	46	64.2	33	16.60	7	0
2002	72.8	24	81.1	20	64.4	30	9.93	37	0
2001	72.2	33	80.7	29	63.8	39	10.64	31	0
2000	70.2	53	77.9	51	62.4	52	14.49	12	0
1999	74.5	4	83.3	2	65.6	9	7.76	50	0
1998	72.8	24	81.1	20	64.5	26	14.26	13	0
1997	71.6	39	80.8	26	62.4	52	10.39	33	0
1996	70.4	50	77.6	56	63.2	44	13.24	21	0
1995	72.9	21	81.3	18	64.5	26	6.76	55	0
1994	73	19	80.9	25	65.1	18	8.53	47	0
1993	72.6	28	81.1	20	64.2	33	4.91	59	0
1992	69.4	61	77.8	54	61	61	17.71	5	0
1991	73.3	15	82.5	6	64.1	36	12.71	24	0
1990	72.1	35	79.6	38	64.6	24	22.31	1	0
1989	71.9	37	79.4	41	64.4	30	20.44	2	0
1988	72.6	28	80.7	29	64.6	24	4.52	61	0
1987	71.6	39	79.3	43	63.9	37	8.89	43	0
1986	70.4	50	78	49	62.8	49	9.82	38	0
1985	70.2	53	77.4	59	63	47	13.57	19	0
1984	72	36	79.1	44	64.8	22	13.97	16	0
1983	72.5	30	80.8	26	64.2	33	10.83	29	0
1982	69.6	58	77.1	61	62	57	14.14	15	0
1981	70.8	47	78.8	47	62.8	49	8.67	46	0
1980	73.3	15	81.3	18	65.2	17	7.28	53	0
1979	69.6	58	76.8	62	62.4	52	10.66	30	0
1978	70.1	56	77.5	58	62.8	49	9.33	40	1
1977	70.8	47	78.5	48	63	47	10.85	28	0
1976	71.7	38	79.8	36	63.5	40	13.87	17	0
1975	71.2	44	79.1	44	63.2	44	12.54	25	0
1974	70.9	45	79.7	37	62.1	56	6.13	56	0
1973	72.7	26	80.6	31	64.8	22	9.94	36	0
1972	69.9	57	78	49	61.8	59	9.25	41	0
1971	70.8	47	79.6	38	62	57	9.06	42	0
1970	71.5	42	79.4	41	63.5	40	8.72	44	0
1969	72.4	32	80.3	34	64.5	26	13.76	18	0
1968	69.5	60	77.9	51	61.1	60	8.49	48	0
1967	70.9	45	76.7	63	65.1	18	15.64	10	0
1966	73	19	82.7	5	63.3	43	3.67	63	0
1965	68.7	63	77.6	56	59.8	63	7.40	52	0
1964	69	62	77.4	59	60.7	62	5.10	58	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
2010	74.8
2022	74.7
2020	74.6
2025	74.5
2016	74.5
1999	74.5
2024	74.3
2011	74
2019	73.8
2021	73.7

Coldest
Year	Mean, °F
1965	68.7
1964	69
1992	69.4
1968	69.5
1982	69.6
1979	69.6
1972	69.9
1978	70.1
2004	70.2
2000	70.2
More years share the last value

Wettest
Year	Precipitation, in
1990	22.31
1989	20.44
2014	18.82
2012	18.54
1992	17.71
2011	17.02
2003	16.60
2006	16.51
2026	16.37
1967	15.64

Driest
Year	Precipitation, in
1966	3.67
2005	3.74
1988	4.52
2022	4.75
1993	4.91
1964	5.10
2016	5.25
1974	6.13
1995	6.76
2015	7.27

The hottest, coldest and wettest days

Hottest day: 98°F; 3 July 2026
Coldest night: 46°F; 2 June 2026
Wettest day: 3.27 in; 20 August 2026

Every month, season and year

Months

Seasons

Years

Islip, NY the day's answers

All-time records

Every answer in words

Summer 2026 brought 16.37 in of precipitation in Islip, NY, the wettest summer since 2014, 9th wettest of 63.
The hottest day of summer 2026 in Islip, NY: 98°F on Friday 3 July 2026.
The coldest night of summer 2026 in Islip, NY: a low of 46°F on Tuesday 2 June 2026.
The wettest day of summer 2026 in Islip, NY: 3.27 in on Thursday 20 August 2026.