Point Forecast: Herndon VA  38.97N 77.38W (Elev. 354 ft)	Last Update: 7:30 am EDT Mar 28, 2025

[hide menu]

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: 8am Fri, Mar 28 20259am Fri, Mar 28 202510am Fri, Mar 28 202511am Fri, Mar 28 202512pm Fri, Mar 28 20251pm Fri, Mar 28 20252pm Fri, Mar 28 20253pm Fri, Mar 28 20254pm Fri, Mar 28 20255pm Fri, Mar 28 20256pm Fri, Mar 28 20257pm Fri, Mar 28 20258pm Fri, Mar 28 20259pm Fri, Mar 28 202510pm Fri, Mar 28 202511pm Fri, Mar 28 202512am Sat, Mar 29 20251am Sat, Mar 29 20252am Sat, Mar 29 20253am Sat, Mar 29 20254am Sat, Mar 29 20255am Sat, Mar 29 20256am Sat, Mar 29 20257am Sat, Mar 29 20258am Sat, Mar 29 20259am Sat, Mar 29 202510am Sat, Mar 29 202511am Sat, Mar 29 202512pm Sat, Mar 29 20251pm Sat, Mar 29 20252pm Sat, Mar 29 20253pm Sat, Mar 29 20254pm Sat, Mar 29 20255pm Sat, Mar 29 20256pm Sat, Mar 29 20257pm Sat, Mar 29 20258pm Sat, Mar 29 20259pm Sat, Mar 29 202510pm Sat, Mar 29 202511pm Sat, Mar 29 202512am Sun, Mar 30 20251am Sun, Mar 30 20252am Sun, Mar 30 20253am Sun, Mar 30 20254am Sun, Mar 30 20255am Sun, Mar 30 20256am Sun, Mar 30 20257am Sun, Mar 30 20258am Sun, Mar 30 20259am Sun, Mar 30 202510am Sun, Mar 30 202511am Sun, Mar 30 202512pm Sun, Mar 30 20251pm Sun, Mar 30 20252pm Sun, Mar 30 20253pm Sun, Mar 30 20254pm Sun, Mar 30 20255pm Sun, Mar 30 20256pm Sun, Mar 30 20257pm Sun, Mar 30 20258pm Sun, Mar 30 20259pm Sun, Mar 30 202510pm Sun, Mar 30 202511pm Sun, Mar 30 202512am Mon, Mar 31 20251am Mon, Mar 31 20252am Mon, Mar 31 20253am Mon, Mar 31 20254am Mon, Mar 31 20255am Mon, Mar 31 20256am Mon, Mar 31 20257am Mon, Mar 31 20258am Mon, Mar 31 20259am Mon, Mar 31 202510am Mon, Mar 31 202511am Mon, Mar 31 202512pm Mon, Mar 31 20251pm Mon, Mar 31 20252pm Mon, Mar 31 20253pm Mon, Mar 31 20254pm Mon, Mar 31 20255pm Mon, Mar 31 20256pm Mon, Mar 31 20257pm Mon, Mar 31 20258pm Mon, Mar 31 20259pm Mon, Mar 31 202510pm Mon, Mar 31 202511pm Mon, Mar 31 202512am Tue, Apr 1 20251am Tue, Apr 1 20252am Tue, Apr 1 20253am Tue, Apr 1 20254am Tue, Apr 1 20255am Tue, Apr 1 20256am Tue, Apr 1 20257am Tue, Apr 1 20258am Tue, Apr 1 20259am Tue, Apr 1 202510am Tue, Apr 1 202511am Tue, Apr 1 202512pm Tue, Apr 1 20251pm Tue, Apr 1 20252pm Tue, Apr 1 20253pm Tue, Apr 1 20254pm Tue, Apr 1 20255pm Tue, Apr 1 20256pm Tue, Apr 1 20257pm Tue, Apr 1 2025

Date	03/28																03/29
Hour (EDT)	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07
Temperature (°F)	42	47	53	57	59	62	63	65	65	65	64	64	62	61	61	60	59	60	59	59	58	57	58	58
Dewpoint (°F)	31	31	32	32	33	35	37	39	41	43	46	46	48	48	48	48	48	47	47	47	47	46	46	46
Wind Chill (°F)	42	46
Surface Wind (mph)	2	3	3	5	7	8	10	11	13	13	10	7	5	6	7	8	9	10	10	9	9	9	9	9
Wind Dir	S	SW	SW	S	S	S	SW	SW	SW	SW	SW	SW	S	S	S	S	SW	SW	SW	SW	SW	SW	SW	SW
Gust								18	20	20	18
Sky Cover (%)	79	79	82	85	83	81	82	82	83	78	72	68	52	37	34	39	41	32	30	38	42	48	64	74
Precipitation Potential (%)	2	2	2	14	18	32	35	43	50	29	31	48	25	12	7	4	5	7	5	5	5	5	6	7
Relative Humidity (%)	65	53	44	38	37	36	38	38	41	45	52	52	60	62	62	64	67	62	64	64	67	67	64	64
Rain	--	--	--	--	SChc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Snow	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Freezing Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Sleet	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date																	03/30
Hour (EDT)	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07
Temperature (°F)	59	61	65	69	72	75	79	79	81	80	78	75	73	71	69	68	66	65	64	63	63	62	62	62
Dewpoint (°F)	47	47	48	49	49	47	47	47	48	49	49	49	49	50	50	50	51	51	51	52	52	53	53	54
Wind Chill (°F)
Surface Wind (mph)	10	10	10	10	11	13	13	14	14	13	11	8	7	7	8	8	8	8	7	7	7	8	8	9
Wind Dir	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	S	S	SW	SW	SW	SW	SW	SW	S	S	S	S
Gust				18	20	22	22	24	24	22	18
Sky Cover (%)	85	85	83	81	75	68	60	57	47	47	48	51	56	61	66	70	72	73	74	74	73	72	75	78
Precipitation Potential (%)	6	6	6	5	5	5	5	5	5	5	5	5	4	4	4	4	4	4	6	6	6	6	6	6
Relative Humidity (%)	64	60	54	49	44	37	32	32	32	34	36	40	43	47	51	52	58	60	63	67	67	72	72	75
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Snow	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Freezing Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Sleet	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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