Point Forecast: Herndon VA  38.97N 77.38W (Elev. 354 ft)	Last Update: 10:29 pm EDT Jun 15, 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: 11pm Sun, Jun 15 202512am Mon, Jun 16 20251am Mon, Jun 16 20252am Mon, Jun 16 20253am Mon, Jun 16 20254am Mon, Jun 16 20255am Mon, Jun 16 20256am Mon, Jun 16 20257am Mon, Jun 16 20258am Mon, Jun 16 20259am Mon, Jun 16 202510am Mon, Jun 16 202511am Mon, Jun 16 202512pm Mon, Jun 16 20251pm Mon, Jun 16 20252pm Mon, Jun 16 20253pm Mon, Jun 16 20254pm Mon, Jun 16 20255pm Mon, Jun 16 20256pm Mon, Jun 16 20257pm Mon, Jun 16 20258pm Mon, Jun 16 20259pm Mon, Jun 16 202510pm Mon, Jun 16 202511pm Mon, Jun 16 202512am Tue, Jun 17 20251am Tue, Jun 17 20252am Tue, Jun 17 20253am Tue, Jun 17 20254am Tue, Jun 17 20255am Tue, Jun 17 20256am Tue, Jun 17 20257am Tue, Jun 17 20258am Tue, Jun 17 20259am Tue, Jun 17 202510am Tue, Jun 17 202511am Tue, Jun 17 202512pm Tue, Jun 17 20251pm Tue, Jun 17 20252pm Tue, Jun 17 20253pm Tue, Jun 17 20254pm Tue, Jun 17 20255pm Tue, Jun 17 20256pm Tue, Jun 17 20257pm Tue, Jun 17 20258pm Tue, Jun 17 20259pm Tue, Jun 17 202510pm Tue, Jun 17 202511pm Tue, Jun 17 202512am Wed, Jun 18 20251am Wed, Jun 18 20252am Wed, Jun 18 20253am Wed, Jun 18 20254am Wed, Jun 18 20255am Wed, Jun 18 20256am Wed, Jun 18 20257am Wed, Jun 18 20258am Wed, Jun 18 20259am Wed, Jun 18 202510am Wed, Jun 18 202511am Wed, Jun 18 202512pm Wed, Jun 18 20251pm Wed, Jun 18 20252pm Wed, Jun 18 20253pm Wed, Jun 18 20254pm Wed, Jun 18 20255pm Wed, Jun 18 20256pm Wed, Jun 18 20257pm Wed, Jun 18 20258pm Wed, Jun 18 20259pm Wed, Jun 18 202510pm Wed, Jun 18 202511pm Wed, Jun 18 202512am Thu, Jun 19 20251am Thu, Jun 19 20252am Thu, Jun 19 20253am Thu, Jun 19 20254am Thu, Jun 19 20255am Thu, Jun 19 20256am Thu, Jun 19 20257am Thu, Jun 19 20258am Thu, Jun 19 20259am Thu, Jun 19 202510am Thu, Jun 19 202511am Thu, Jun 19 202512pm Thu, Jun 19 20251pm Thu, Jun 19 20252pm Thu, Jun 19 20253pm Thu, Jun 19 20254pm Thu, Jun 19 20255pm Thu, Jun 19 20256pm Thu, Jun 19 20257pm Thu, Jun 19 20258pm Thu, Jun 19 20259pm Thu, Jun 19 202510pm Thu, Jun 19 202511pm Thu, Jun 19 202512am Fri, Jun 20 20251am Fri, Jun 20 20252am Fri, Jun 20 20253am Fri, Jun 20 20254am Fri, Jun 20 20255am Fri, Jun 20 20256am Fri, Jun 20 20257am Fri, Jun 20 20258am Fri, Jun 20 20259am Fri, Jun 20 202510am Fri, Jun 20 2025

Date	06/15	06/16
Hour (EDT)	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22
Temperature (°F)	67	66	65	65	64	65	64	64	64	64	65	66	67	68	69	70	70	72	72	72	71	70	69	68
Dewpoint (°F)	66	65	65	65	64	64	64	64	64	64	64	65	66	66	66	67	66	67	67	67	67	66	67	67
Heat Index (°F)
Surface Wind (mph)	7	7	7	7	7	7	7	6	6	6	7	6	6	6	6	7	7	7	7	6	6	6	5	5
Wind Dir	E	E	E	E	E	E	NE	NE	NE	NE	NE	NE	NE	NE	E	NE	NE	E	E	E	E	E	E	E
Gust
Sky Cover (%)	88	88	85	88	86	90	95	95	91	92	88	90	95	90	91	92	97	83	87	88	87	85	79	83
Precipitation Potential (%)	66	56	67	50	46	41	50	52	47	53	54	40	32	24	25	25	20	19	25	21	17	37	37	37
Relative Humidity (%)	97	97	100	100	100	97	100	100	100	100	97	97	97	93	90	90	87	84	84	84	87	87	93	97
Rain	Lkly	Lkly	Lkly	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	SChc	Chc	Chc	SChc	SChc	Chc	SChc	SChc	Chc	Chc	Chc
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date		06/17
Hour (EDT)	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22
Temperature (°F)	68	68	67	67	67	67	67	67	67	68	69	70	72	74	75	77	78	80	80	80	79	78	77	75
Dewpoint (°F)	67	67	67	67	67	67	67	67	67	68	68	69	69	70	70	71	72	72	73	73	73	73	73	73
Heat Index (°F)															75	77	78	84	84	84	79	78	77	75
Surface Wind (mph)	5	5	3	3	3	5	5	5	6	6	6	6	6	6	7	7	7	7	7	7	6	6	6	6
Wind Dir	E	E	E	E	E	E	E	SE	SE	SE	SE	SE	SE	SE	S	S	S	S	S	S	S	S	S	S
Gust
Sky Cover (%)	86	87	89	90	91	93	94	93	92	91	91	90	90	88	85	83	80	76	73	79	86	92	88	85
Precipitation Potential (%)	37	37	37	34	34	34	34	34	34	21	21	21	21	21	21	69	69	69	69	69	69	63	63	63
Relative Humidity (%)	97	97	100	100	100	100	100	100	100	100	97	97	90	87	84	82	82	77	79	79	82	85	87	94
Rain	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	SChc	SChc	SChc	SChc	SChc	SChc	Lkly	Lkly	Lkly	Lkly	Lkly	Lkly	Lkly	Lkly	Lkly
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc	Chc	Chc	Chc	Chc	Chc	Chc

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