Point Forecast: Reston VA  38.97N 77.36W (Elev. 430 ft)	Last Update: 6:53 pm EST Dec 9, 2025

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Weather Elements Fire Weather Aviation Weather Temperature (°F) Dewpoint (°F) Wind Chill (°F) Surface Wind  ktmphkm/hm/s Sky Cover (%) Precipitation Potential (%) Relative Humidity (%) Rain Thunder Snow Freezing Rain Sleet 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: 8pm Tue, Dec 9 20259pm Tue, Dec 9 202510pm Tue, Dec 9 202511pm Tue, Dec 9 202512am Wed, Dec 10 20251am Wed, Dec 10 20252am Wed, Dec 10 20253am Wed, Dec 10 20254am Wed, Dec 10 20255am Wed, Dec 10 20256am Wed, Dec 10 20257am Wed, Dec 10 20258am Wed, Dec 10 20259am Wed, Dec 10 202510am Wed, Dec 10 202511am Wed, Dec 10 202512pm Wed, Dec 10 20251pm Wed, Dec 10 20252pm Wed, Dec 10 20253pm Wed, Dec 10 20254pm Wed, Dec 10 20255pm Wed, Dec 10 20256pm Wed, Dec 10 20257pm Wed, Dec 10 20258pm Wed, Dec 10 20259pm Wed, Dec 10 202510pm Wed, Dec 10 202511pm Wed, Dec 10 202512am Thu, Dec 11 20251am Thu, Dec 11 20252am Thu, Dec 11 20253am Thu, Dec 11 20254am Thu, Dec 11 20255am Thu, Dec 11 20256am Thu, Dec 11 20257am Thu, Dec 11 20258am Thu, Dec 11 20259am Thu, Dec 11 202510am Thu, Dec 11 202511am Thu, Dec 11 202512pm Thu, Dec 11 20251pm Thu, Dec 11 20252pm Thu, Dec 11 20253pm Thu, Dec 11 20254pm Thu, Dec 11 20255pm Thu, Dec 11 20256pm Thu, Dec 11 20257pm Thu, Dec 11 20258pm Thu, Dec 11 20259pm Thu, Dec 11 202510pm Thu, Dec 11 202511pm Thu, Dec 11 202512am Fri, Dec 12 20251am Fri, Dec 12 20252am Fri, Dec 12 20253am Fri, Dec 12 20254am Fri, Dec 12 20255am Fri, Dec 12 20256am Fri, Dec 12 20257am Fri, Dec 12 20258am Fri, Dec 12 20259am Fri, Dec 12 202510am Fri, Dec 12 202511am Fri, Dec 12 202512pm Fri, Dec 12 20251pm Fri, Dec 12 20252pm Fri, Dec 12 20253pm Fri, Dec 12 20254pm Fri, Dec 12 20255pm Fri, Dec 12 20256pm Fri, Dec 12 20257pm Fri, Dec 12 20258pm Fri, Dec 12 20259pm Fri, Dec 12 202510pm Fri, Dec 12 202511pm Fri, Dec 12 202512am Sat, Dec 13 20251am Sat, Dec 13 20252am Sat, Dec 13 20253am Sat, Dec 13 20254am Sat, Dec 13 20255am Sat, Dec 13 20256am Sat, Dec 13 20257am Sat, Dec 13 20258am Sat, Dec 13 20259am Sat, Dec 13 202510am Sat, Dec 13 202511am Sat, Dec 13 202512pm Sat, Dec 13 20251pm Sat, Dec 13 20252pm Sat, Dec 13 20253pm Sat, Dec 13 20254pm Sat, Dec 13 20255pm Sat, Dec 13 20256pm Sat, Dec 13 20257pm Sat, Dec 13 20258pm Sat, Dec 13 20259pm Sat, Dec 13 202510pm Sat, Dec 13 202511pm Sat, Dec 13 202512am Sun, Dec 14 20251am Sun, Dec 14 20252am Sun, Dec 14 20253am Sun, Dec 14 20254am Sun, Dec 14 20255am Sun, Dec 14 20256am Sun, Dec 14 20257am Sun, Dec 14 2025

Date	12/09				12/10
Hour (EST)	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19
Temperature (°F)	28	28	29	29	30	30	30	30	31	32	31	32	33	35	37	39	41	43	44	45	44	43	42	41
Dewpoint (°F)	20	22	23	24	25	25	25	26	26	26	27	27	28	30	31	31	32	32	33	33	34	35	35	35
Wind Chill (°F)	19	19	20	20	21	21	21	20	22	23	21	23	23	26	28	31	33	36	37	39	38	36	36	34
Surface Wind (mph)	10	10	10	10	10	10	10	11	11	11	13	13	14	14	15	15	14	14	14	14	13	13	11	11
Wind Dir	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	SW	SW	SW	SW	SW	SW
Gust	21	21	21	20	21	21	21	21	21	21	20	21	22	25	26	26	26	25	23	23	22	20	18
Sky Cover (%)	59	71	72	72	78	81	80	77	75	84	83	89	91	90	93	93	93	94	92	88	83	68	52	55
Precipitation Potential (%)	0	0	0	0	1	4	6	3	2	6	8	13	18	22	24	25	26	30	19	17	12	9	7	5
Relative Humidity (%)	71	78	78	81	81	81	81	85	81	78	85	81	82	82	79	73	70	65	65	62	68	73	76	79
Rain	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc	Chc	Chc	Chc	SChc	SChc	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Snow	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Freezing Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Sleet	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date					12/11
Hour (EST)	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19
Temperature (°F)	41	40	39	38	37	37	36	35	34	33	32	31	31	32	34	35	37	37	38	37	36	34	33	31
Dewpoint (°F)	35	34	33	31	30	28	27	25	24	23	20	20	19	18	18	17	17	16	16	16	16	16	17	17
Wind Chill (°F)	35	33	32	31	29	29	27	26	25	24	23	21	21	23	25	26	28	28	30	28	28	26	25	24
Surface Wind (mph)	10	10	10	11	13	13	14	14	13	13	13	13	13	13	14	14	14	14	14	14	13	11	10	8
Wind Dir	SW	SW	W	W	W	W	W	NW	NW	NW	NW	NW	NW	NW	NW	NW	W	W	W	W	W	W	W	W
Gust				18	20	21	21	21	21	20	20	21	22	23	24	25	25	25	24	23	22	21	18
Sky Cover (%)	53	49	42	42	49	58	59	59	60	60	62	62	47	33	18	18	18	18	17	16	16	18	21	23
Precipitation Potential (%)	5	5	6	6	6	0	0	0	0	0	0	1	1	1	1	1	1	0	0	0	0	0	0	1
Relative Humidity (%)	79	79	79	76	75	70	69	66	66	66	61	63	61	56	51	47	44	42	40	42	43	47	51	56
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Snow	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Freezing Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Sleet	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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