Point Forecast: Mc Lean VA  38.95N 77.19W (Elev. 253 ft)	Last Update: 2:23 am EDT Jun 17, 2026

[hide menu]

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 Low Visibility Occurrence Risk Index Ceiling Height Visibility

48-Hour Period Starting: 3am Wed, Jun 17 20264am Wed, Jun 17 20265am Wed, Jun 17 20266am Wed, Jun 17 20267am Wed, Jun 17 20268am Wed, Jun 17 20269am Wed, Jun 17 202610am Wed, Jun 17 202611am Wed, Jun 17 202612pm Wed, Jun 17 20261pm Wed, Jun 17 20262pm Wed, Jun 17 20263pm Wed, Jun 17 20264pm Wed, Jun 17 20265pm Wed, Jun 17 20266pm Wed, Jun 17 20267pm Wed, Jun 17 20268pm Wed, Jun 17 20269pm Wed, Jun 17 202610pm Wed, Jun 17 202611pm Wed, Jun 17 202612am Thu, Jun 18 20261am Thu, Jun 18 20262am Thu, Jun 18 20263am Thu, Jun 18 20264am Thu, Jun 18 20265am Thu, Jun 18 20266am Thu, Jun 18 20267am Thu, Jun 18 20268am Thu, Jun 18 20269am Thu, Jun 18 202610am Thu, Jun 18 202611am Thu, Jun 18 202612pm Thu, Jun 18 20261pm Thu, Jun 18 20262pm Thu, Jun 18 20263pm Thu, Jun 18 20264pm Thu, Jun 18 20265pm Thu, Jun 18 20266pm Thu, Jun 18 20267pm Thu, Jun 18 20268pm Thu, Jun 18 20269pm Thu, Jun 18 202610pm Thu, Jun 18 202611pm Thu, Jun 18 202612am Fri, Jun 19 20261am Fri, Jun 19 20262am Fri, Jun 19 20263am Fri, Jun 19 20264am Fri, Jun 19 20265am Fri, Jun 19 20266am Fri, Jun 19 20267am Fri, Jun 19 20268am Fri, Jun 19 20269am Fri, Jun 19 202610am Fri, Jun 19 202611am Fri, Jun 19 202612pm Fri, Jun 19 20261pm Fri, Jun 19 20262pm Fri, Jun 19 20263pm Fri, Jun 19 20264pm Fri, Jun 19 20265pm Fri, Jun 19 20266pm Fri, Jun 19 20267pm Fri, Jun 19 20268pm Fri, Jun 19 20269pm Fri, Jun 19 202610pm Fri, Jun 19 202611pm Fri, Jun 19 202612am Sat, Jun 20 20261am Sat, Jun 20 20262am Sat, Jun 20 20263am Sat, Jun 20 20264am Sat, Jun 20 20265am Sat, Jun 20 20266am Sat, Jun 20 20267am Sat, Jun 20 20268am Sat, Jun 20 20269am Sat, Jun 20 202610am Sat, Jun 20 202611am Sat, Jun 20 202612pm Sat, Jun 20 20261pm Sat, Jun 20 20262pm Sat, Jun 20 20263pm Sat, Jun 20 20264pm Sat, Jun 20 20265pm Sat, Jun 20 20266pm Sat, Jun 20 20267pm Sat, Jun 20 20268pm Sat, Jun 20 20269pm Sat, Jun 20 202610pm Sat, Jun 20 202611pm Sat, Jun 20 202612am Sun, Jun 21 20261am Sun, Jun 21 20262am Sun, Jun 21 20263am Sun, Jun 21 20264am Sun, Jun 21 20265am Sun, Jun 21 20266am Sun, Jun 21 20267am Sun, Jun 21 20268am Sun, Jun 21 20269am Sun, Jun 21 202610am Sun, Jun 21 202611am Sun, Jun 21 202612pm Sun, Jun 21 20261pm Sun, Jun 21 20262pm Sun, Jun 21 2026

Date	06/17																					06/18
Hour (EDT)	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02
Temperature (°F)	65	65	64	63	65	68	71	77	80	82	84	85	86	86	85	87	85	84	79	77	75	75	73	73
Dewpoint (°F)	60	60	60	61	62	63	63	63	61	59	58	57	57	57	57	57	57	58	59	60	61	61	61	61
Heat Index (°F)								77	81	82	84	84	85	85	84	86	84	84	79	77	75	75
Surface Wind (mph)	3	2	2	2	3	3	3	3	5	5	6	7	7	8	8	8	7	6	6	6	6	8	8	9
Wind Dir	S	S	S	S	S	S	S	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	S	S	S	S	S	S
Gust																							18	20
Sky Cover (%)	76	85	83	54	46	11	6	3	7	4	13	41	28	21	30	31	32	37	32	21	42	37	49	49
Precipitation Potential (%)	17	16	8	3	2	0	0	0	0	0	2	3	3	2	2	3	3	2	2	2	2	2	2	2
Relative Humidity (%)	84	84	87	93	90	84	76	62	52	46	41	39	37	37	39	36	39	41	50	56	62	62	66	66
Rain	SChc	SChc	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date																						06/19
Hour (EDT)	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02
Temperature (°F)	73	72	73	73	73	77	80	85	87	89	91	89	89	89	87	88	87	84	81	79	78	76	75	73
Dewpoint (°F)	61	60	60	60	62	64	65	67	68	69	70	71	70	70	69	67	66	66	66	65	64	64	64	64
Heat Index (°F)						77	82	88	91	94	97	95	94	94	91	91	89	86	83	79	78	76	75
Surface Wind (mph)	9	10	11	13	13	14	14	14	15	15	16	15	14	14	14	13	11	10	8	7	6	6	6	6
Wind Dir	S	S	S	S	S	SW	SW	SW	SW	SW	SW	W	W	W	W	W	W	W	W	W	W	W	NW	NW
Gust	20	22	23	24	25	25	26	26	28	30	30	29	28	28	28	25	23	20
Sky Cover (%)	50	48	58	62	49	57	56	53	45	38	45	58	20	51	42	34	47	46	48	53	57	60	63	66
Precipitation Potential (%)	2	2	2	2	3	10	8	4	7	9	23	0	0	27	7	5	13	13	13	13	13	13	13	33
Relative Humidity (%)	66	66	64	64	68	64	60	55	53	52	50	56	54	54	55	50	50	55	60	62	62	66	69	73
Rain	--	--	--	--	--	--	--	--	--	--	SChc	--	--	Chc	--	--	--	--	--	--	--	--	--	Chc
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	Chc	--	--	--	--	--	--	--	--	--	--

International System of Units Forecast Discussion 7-Day Forecast Hourly Weather Graph Hazardous Weather Briefing Page Past Weather Information Interactive Forecast Map Home