Point Forecast: Ashburn VA  39.05N 77.49W (Elev. 299 ft)	Last Update: 1:30 am EDT Jul 19, 2025

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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 Low Visibility Occurrence Risk Index Ceiling Height Visibility

48-Hour Period Starting: 2am Sat, Jul 19 20253am Sat, Jul 19 20254am Sat, Jul 19 20255am Sat, Jul 19 20256am Sat, Jul 19 20257am Sat, Jul 19 20258am Sat, Jul 19 20259am Sat, Jul 19 202510am Sat, Jul 19 202511am Sat, Jul 19 202512pm Sat, Jul 19 20251pm Sat, Jul 19 20252pm Sat, Jul 19 20253pm Sat, Jul 19 20254pm Sat, Jul 19 20255pm Sat, Jul 19 20256pm Sat, Jul 19 20257pm Sat, Jul 19 20258pm Sat, Jul 19 20259pm Sat, Jul 19 202510pm Sat, Jul 19 202511pm Sat, Jul 19 202512am Sun, Jul 20 20251am Sun, Jul 20 20252am Sun, Jul 20 20253am Sun, Jul 20 20254am Sun, Jul 20 20255am Sun, Jul 20 20256am Sun, Jul 20 20257am Sun, Jul 20 20258am Sun, Jul 20 20259am Sun, Jul 20 202510am Sun, Jul 20 202511am Sun, Jul 20 202512pm Sun, Jul 20 20251pm Sun, Jul 20 20252pm Sun, Jul 20 20253pm Sun, Jul 20 20254pm Sun, Jul 20 20255pm Sun, Jul 20 20256pm Sun, Jul 20 20257pm Sun, Jul 20 20258pm Sun, Jul 20 20259pm Sun, Jul 20 202510pm Sun, Jul 20 202511pm Sun, Jul 20 202512am Mon, Jul 21 20251am Mon, Jul 21 20252am Mon, Jul 21 20253am Mon, Jul 21 20254am Mon, Jul 21 20255am Mon, Jul 21 20256am Mon, Jul 21 20257am Mon, Jul 21 20258am Mon, Jul 21 20259am Mon, Jul 21 202510am Mon, Jul 21 202511am Mon, Jul 21 202512pm Mon, Jul 21 20251pm Mon, Jul 21 20252pm Mon, Jul 21 20253pm Mon, Jul 21 20254pm Mon, Jul 21 20255pm Mon, Jul 21 20256pm Mon, Jul 21 20257pm Mon, Jul 21 20258pm Mon, Jul 21 20259pm Mon, Jul 21 202510pm Mon, Jul 21 202511pm Mon, Jul 21 202512am Tue, Jul 22 20251am Tue, Jul 22 20252am Tue, Jul 22 20253am Tue, Jul 22 20254am Tue, Jul 22 20255am Tue, Jul 22 20256am Tue, Jul 22 20257am Tue, Jul 22 20258am Tue, Jul 22 20259am Tue, Jul 22 202510am Tue, Jul 22 202511am Tue, Jul 22 202512pm Tue, Jul 22 20251pm Tue, Jul 22 20252pm Tue, Jul 22 20253pm Tue, Jul 22 20254pm Tue, Jul 22 20255pm Tue, Jul 22 20256pm Tue, Jul 22 20257pm Tue, Jul 22 20258pm Tue, Jul 22 20259pm Tue, Jul 22 202510pm Tue, Jul 22 202511pm Tue, Jul 22 202512am Wed, Jul 23 20251am Wed, Jul 23 20252am Wed, Jul 23 20253am Wed, Jul 23 20254am Wed, Jul 23 20255am Wed, Jul 23 20256am Wed, Jul 23 20257am Wed, Jul 23 20258am Wed, Jul 23 20259am Wed, Jul 23 202510am Wed, Jul 23 202511am Wed, Jul 23 202512pm Wed, Jul 23 20251pm Wed, Jul 23 2025

Date	07/19																						07/20
Hour (EDT)	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01
Temperature (°F)	73	73	73	73	72	73	74	76	79	80	82	83	84	84	84	83	82	81	80	78	76	76	75	75
Dewpoint (°F)	72	72	72	72	72	72	74	74	75	75	76	76	76	76	76	75	76	75	75	75	75	75	75	74
Heat Index (°F)								76	79	85	89	91	93	93	93	90	89	87	85	78	76	76	75	75
Surface Wind (mph)	2	2	2	2	2	2	2	2	2	2	3	3	5	5	5	5	5	3	5	3	2	2	2	2
Wind Dir	SE	SE	E	SE	SE	SE	SE	SE	SE	S	SW	SW	SW	SW	SE	S	S	S	S	S	S	S	S	S
Gust
Sky Cover (%)	43	62	76	80	80	76	77	77	77	81	79	80	75	78	63	68	59	57	56	37	49	57	57	62
Precipitation Potential (%)	21	21	21	20	15	9	4	3	4	9	19	33	59	53	45	52	37	36	18	9	9	6	5	6
Relative Humidity (%)	97	97	97	97	100	97	100	94	88	85	82	80	77	77	77	77	82	82	85	91	97	97	100	97
Rain	SChc	SChc	SChc	SChc	SChc	--	--	--	--	--	SChc	Chc	Lkly	Chc	Chc	Chc	Chc	Chc	SChc	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	SChc	SChc	Chc	Chc	Chc	Chc	Chc	Chc	SChc	--	--	--	--	--
Date																							07/21
Hour (EDT)	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01
Temperature (°F)	74	73	73	73	72	73	76	79	82	85	87	89	90	90	89	87	86	85	83	81	79	77	76	75
Dewpoint (°F)	74	73	73	73	72	72	74	75	75	75	75	76	76	76	75	75	75	74	74	73	73	72	71	71
Heat Index (°F)							76	79	89	94	96	100	102	102	99	96	95	93	90	86	79	77	76	75
Surface Wind (mph)	2	2	2	2	2	2	2	3	5	6	7	8	9	9	9	9	8	8	7	7	6	6	6	6
Wind Dir	S	S	SW	S	SW	SW	W	W	W	W	W	W	W	W	W	W	NW	NW	NW	NW	NW	NW	NW	NW
Gust
Sky Cover (%)	62	57	44	51	46	48	42	48	50	52	54	57	59	59	59	59	59	59	59	57	55	53	51	49
Precipitation Potential (%)	8	5	4	4	4	4	8	8	8	8	8	8	38	38	38	38	38	38	11	11	11	11	11	11
Relative Humidity (%)	100	100	100	100	100	97	94	88	79	72	68	66	64	64	64	68	70	70	74	77	82	85	85	87
Rain	--	--	--	--	--	--	--	--	--	--	--	--	Chc	Chc	Chc	Chc	Chc	Chc	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	Chc	Chc	Chc	Chc	Chc	Chc	--	--	--	--	--	--

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