Point Forecast: Mc Lean VA  38.95N 77.19W (Elev. 77 m)	Last Update: 10:53 pm EDT Aug 12, 2026

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Weather Elements Fire Weather Aviation Weather Temperature (°C) Dewpoint (°C) Heat Index (°C) 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-m) Atmospheric Dispersion Index Low Visibility Occurrence Risk Index Ceiling Height Visibility

48-Hour Period Starting: 1am Thu, Aug 13 20262am Thu, Aug 13 20263am Thu, Aug 13 20264am Thu, Aug 13 20265am Thu, Aug 13 20266am Thu, Aug 13 20267am Thu, Aug 13 20268am Thu, Aug 13 20269am Thu, Aug 13 202610am Thu, Aug 13 202611am Thu, Aug 13 202612pm Thu, Aug 13 20261pm Thu, Aug 13 20262pm Thu, Aug 13 20263pm Thu, Aug 13 20264pm Thu, Aug 13 20265pm Thu, Aug 13 20266pm Thu, Aug 13 20267pm Thu, Aug 13 20268pm Thu, Aug 13 20269pm Thu, Aug 13 202610pm Thu, Aug 13 202611pm Thu, Aug 13 202612am Fri, Aug 14 20261am Fri, Aug 14 20262am Fri, Aug 14 20263am Fri, Aug 14 20264am Fri, Aug 14 20265am Fri, Aug 14 20266am Fri, Aug 14 20267am Fri, Aug 14 20268am Fri, Aug 14 20269am Fri, Aug 14 202610am Fri, Aug 14 202611am Fri, Aug 14 202612pm Fri, Aug 14 20261pm Fri, Aug 14 20262pm Fri, Aug 14 20263pm Fri, Aug 14 20264pm Fri, Aug 14 20265pm Fri, Aug 14 20266pm Fri, Aug 14 20267pm Fri, Aug 14 20268pm Fri, Aug 14 20269pm Fri, Aug 14 202610pm Fri, Aug 14 202611pm Fri, Aug 14 202612am Sat, Aug 15 20261am Sat, Aug 15 20262am Sat, Aug 15 20263am Sat, Aug 15 20264am Sat, Aug 15 20265am Sat, Aug 15 20266am Sat, Aug 15 20267am Sat, Aug 15 20268am Sat, Aug 15 20269am Sat, Aug 15 202610am Sat, Aug 15 202611am Sat, Aug 15 202612pm Sat, Aug 15 20261pm Sat, Aug 15 20262pm Sat, Aug 15 20263pm Sat, Aug 15 20264pm Sat, Aug 15 20265pm Sat, Aug 15 20266pm Sat, Aug 15 20267pm Sat, Aug 15 20268pm Sat, Aug 15 20269pm Sat, Aug 15 202610pm Sat, Aug 15 202611pm Sat, Aug 15 202612am Sun, Aug 16 20261am Sun, Aug 16 20262am Sun, Aug 16 20263am Sun, Aug 16 20264am Sun, Aug 16 20265am Sun, Aug 16 20266am Sun, Aug 16 20267am Sun, Aug 16 20268am Sun, Aug 16 20269am Sun, Aug 16 202610am Sun, Aug 16 202611am Sun, Aug 16 202612pm Sun, Aug 16 20261pm Sun, Aug 16 20262pm Sun, Aug 16 20263pm Sun, Aug 16 20264pm Sun, Aug 16 20265pm Sun, Aug 16 20266pm Sun, Aug 16 20267pm Sun, Aug 16 20268pm Sun, Aug 16 20269pm Sun, Aug 16 202610pm Sun, Aug 16 202611pm Sun, Aug 16 202612am Mon, Aug 17 20261am Mon, Aug 17 20262am Mon, Aug 17 20263am Mon, Aug 17 20264am Mon, Aug 17 20265am Mon, Aug 17 20266am Mon, Aug 17 20267am Mon, Aug 17 20268am Mon, Aug 17 20269am Mon, Aug 17 202610am Mon, Aug 17 202611am Mon, Aug 17 202612pm Mon, Aug 17 2026

Date	08/13																							08/14
Hour (EDT)	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00
Temperature (°C)	24	24	23	23	23	23	22	23	25	27	28	29	31	31	32	31	31	31	29	28	27	27	26	26
Dewpoint (°C)	21	21	21	21	21	21	21	21	20	20	20	20	20	20	20	20	19	19	19	19	20	21	21	21
Heat Index (°C)	24	24							25	29	30	31	33	33	34	33	33	32	31	30	29	28	26	26
Surface Wind (mph)	3	3	3	6	5	5	3	5	6	7	8	7	7	8	7	8	7	7	6	3	3	2	2	1
Wind Dir	SW	SW	W	W	W	W	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	N
Gust
Sky Cover (%)	77	76	63	74	74	59	39	26	28	36	37	37	36	38	45	50	57	53	47	47	54	55	55	53
Precipitation Potential (%)	14	6	6	9	10	2	2	2	1	0	1	3	2	6	6	5	4	3	4	6	8	2	2	4
Relative Humidity (%)	79	82	84	87	87	87	90	84	74	65	61	57	53	52	49	52	50	52	55	59	65	69	72	74
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date																								08/15
Hour (EDT)	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00
Temperature (°C)	25	24	24	23	23	23	23	23	24	26	27	28	28	28	28	28	27	27	27	26	24	24	24	23
Dewpoint (°C)	21	20	21	20	20	20	20	20	20	20	21	20	21	21	21	21	21	20	19	20	20	21	21	21
Heat Index (°C)	25	24	24						24	26	28	29	31	31	31	29	29	29	28	26	24	24	24
Surface Wind (mph)	1	1	1	1	2	2	1	2	2	2	2	2	3	3	3	3	3	3	2	2	5	1	1	1
Wind Dir	N	NW	N	N	N	N	N	N	N	N	N	N	N	N	N	NW	NW	NW	N	NE	NE	N	N	N
Gust
Sky Cover (%)	52	54	43	50	54	50	54	68	69	68	71	75	76	76	73	74	76	75	74	67	67	65	65	61
Precipitation Potential (%)	4	5	4	6	6	3	15	52	52	52	52	52	52	55	55	55	55	55	55	34	34	34	34	34
Relative Humidity (%)	76	76	79	82	82	84	84	82	76	71	69	63	63	63	63	65	67	65	65	71	76	79	82	84
Rain	--	--	--	--	--	--	SChc	Chc	Chc	Chc	Chc	Chc	Chc	Lkly	Lkly	Lkly	Lkly	Lkly	Lkly	Chc	Chc	Chc	Chc	Chc
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	--	--

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