Point Forecast: Islip, Long Island Mac Arthur Airport NY  40.78N 73.09W (Elev. 49 ft)	Last Update: 2:33 am EDT Sep 4, 2026

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Weather Elements Fire Weather Aviation Weather Temperature (°F) Dewpoint (°F) Heat Index (°F) Surface Wind  ktmphkm/hm/s Sky Cover (%) Precipitation Potential (%) Relative Humidity (%) Rain Thunder Fog Mixing Height  x100ftx100m Trans. Wind  ktmphkm/hm/s Vent Rate (x1000 mph-ft) Atmospheric Dispersion Index Ceiling Height Visibility

48-Hour Period Starting: 10am Fri, Sep 4 202611am Fri, Sep 4 202612pm Fri, Sep 4 20261pm Fri, Sep 4 20262pm Fri, Sep 4 20263pm Fri, Sep 4 20264pm Fri, Sep 4 20265pm Fri, Sep 4 20266pm Fri, Sep 4 20267pm Fri, Sep 4 20268pm Fri, Sep 4 20269pm Fri, Sep 4 202610pm Fri, Sep 4 202611pm Fri, Sep 4 202612am Sat, Sep 5 20261am Sat, Sep 5 20262am Sat, Sep 5 20263am Sat, Sep 5 20264am Sat, Sep 5 20265am Sat, Sep 5 20266am Sat, Sep 5 20267am Sat, Sep 5 20268am Sat, Sep 5 20269am Sat, Sep 5 202610am Sat, Sep 5 202611am Sat, Sep 5 202612pm Sat, Sep 5 20261pm Sat, Sep 5 20262pm Sat, Sep 5 20263pm Sat, Sep 5 20264pm Sat, Sep 5 20265pm Sat, Sep 5 20266pm Sat, Sep 5 20267pm Sat, Sep 5 20268pm Sat, Sep 5 20269pm Sat, Sep 5 202610pm Sat, Sep 5 202611pm Sat, Sep 5 202612am Sun, Sep 6 20261am Sun, Sep 6 20262am Sun, Sep 6 20263am Sun, Sep 6 20264am Sun, Sep 6 20265am Sun, Sep 6 20266am Sun, Sep 6 20267am Sun, Sep 6 20268am Sun, Sep 6 20269am Sun, Sep 6 202610am Sun, Sep 6 202611am Sun, Sep 6 202612pm Sun, Sep 6 20261pm Sun, Sep 6 20262pm Sun, Sep 6 20263pm Sun, Sep 6 20264pm Sun, Sep 6 20265pm Sun, Sep 6 20266pm Sun, Sep 6 20267pm Sun, Sep 6 20268pm Sun, Sep 6 20269pm Sun, Sep 6 202610pm Sun, Sep 6 202611pm Sun, Sep 6 202612am Mon, Sep 7 20261am Mon, Sep 7 20262am Mon, Sep 7 20263am Mon, Sep 7 20264am Mon, Sep 7 20265am Mon, Sep 7 20266am Mon, Sep 7 20267am Mon, Sep 7 20268am Mon, Sep 7 20269am Mon, Sep 7 202610am Mon, Sep 7 202611am Mon, Sep 7 202612pm Mon, Sep 7 20261pm Mon, Sep 7 20262pm Mon, Sep 7 20263pm Mon, Sep 7 20264pm Mon, Sep 7 20265pm Mon, Sep 7 20266pm Mon, Sep 7 20267pm Mon, Sep 7 20268pm Mon, Sep 7 20269pm Mon, Sep 7 202610pm Mon, Sep 7 202611pm Mon, Sep 7 202612am Tue, Sep 8 20261am Tue, Sep 8 20262am Tue, Sep 8 20263am Tue, Sep 8 20264am Tue, Sep 8 20265am Tue, Sep 8 20266am Tue, Sep 8 20267am Tue, Sep 8 20268am Tue, Sep 8 20269am Tue, Sep 8 202610am Tue, Sep 8 202611am Tue, Sep 8 202612pm Tue, Sep 8 20261pm Tue, Sep 8 20262pm Tue, Sep 8 20263pm Tue, Sep 8 20264pm Tue, Sep 8 20265pm Tue, Sep 8 20266pm Tue, Sep 8 20267pm Tue, Sep 8 20268pm Tue, Sep 8 20269pm Tue, Sep 8 2026

Date	09/04														09/05
Hour (EDT)	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09
Temperature (°F)	77	79	81	81	82	82	83	82	80	78	75	73	72	71	70	69	68	67	66	65	64	64	66	69
Dewpoint (°F)	72	72	72	72	71	72	71	70	70	69	68	68	67	66	65	64	63	62	62	61	61	61	63	63
Heat Index (°F)	77	79	85	85	86	87	88	86	83	78	75
Surface Wind (mph)	6	6	6	7	7	7	7	6	5	5	3	3	3	3	5	5	5	5	6	6	6	7	7	8
Wind Dir	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	N	N	NW	NW	N	N	N	N	N	N	N	N	N	N
Gust
Sky Cover (%)	23	20	23	32	28	22	41	32	32	29	33	42	45	39	19	19	17	6	11	16	17	18	18	6
Precipitation Potential (%)	8	3	3	3	9	9	9	4	4	4	4	4	4	2	2	2	4	4	4	7	7	7	0	0
Relative Humidity (%)	85	79	74	74	69	72	67	67	72	74	79	84	84	84	84	84	84	84	87	87	90	90	90	81
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date															09/06
Hour (EDT)	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09
Temperature (°F)	71	73	75	76	77	78	77	76	76	73	70	68	67	66	65	63	62	61	60	60	60	61	62	64
Dewpoint (°F)	63	62	62	62	62	62	62	62	63	64	63	63	63	63	62	62	61	60	60	60	60	61	61	61
Heat Index (°F)			75	76	77	78	77	76	76
Surface Wind (mph)	8	9	8	8	7	7	7	6	5	5	5	3	3	5	5	5	5	5	6	6	7	7	8	9
Wind Dir	N	N	N	N	N	N	N	N	NE	NE	NE	NE	NE	NE	NE	NE	NE	NE	NE	NE	NE	NE	NE	NE
Gust
Sky Cover (%)	10	11	7	14	33	34	25	25	38	53	54	74	64	54	54	54	51	54	56	59	55	51	47	44
Precipitation Potential (%)	0	0	0	0	8	8	8	6	6	6	24	24	24	24	24	24	13	13	13	13	13	13	10	10
Relative Humidity (%)	76	68	64	62	60	58	60	62	64	73	78	84	87	90	90	97	97	97	100	100	100	100	97	90
Rain	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc	SChc	SChc	SChc	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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