Point Forecast: Fairfax VA  38.85N 77.29W (Elev. 400 ft)	Last Update: 10:55 am EDT May 11, 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: 1pm Mon, May 11 20262pm Mon, May 11 20263pm Mon, May 11 20264pm Mon, May 11 20265pm Mon, May 11 20266pm Mon, May 11 20267pm Mon, May 11 20268pm Mon, May 11 20269pm Mon, May 11 202610pm Mon, May 11 202611pm Mon, May 11 202612am Tue, May 12 20261am Tue, May 12 20262am Tue, May 12 20263am Tue, May 12 20264am Tue, May 12 20265am Tue, May 12 20266am Tue, May 12 20267am Tue, May 12 20268am Tue, May 12 20269am Tue, May 12 202610am Tue, May 12 202611am Tue, May 12 202612pm Tue, May 12 20261pm Tue, May 12 20262pm Tue, May 12 20263pm Tue, May 12 20264pm Tue, May 12 20265pm Tue, May 12 20266pm Tue, May 12 20267pm Tue, May 12 20268pm Tue, May 12 20269pm Tue, May 12 202610pm Tue, May 12 202611pm Tue, May 12 202612am Wed, May 13 20261am Wed, May 13 20262am Wed, May 13 20263am Wed, May 13 20264am Wed, May 13 20265am Wed, May 13 20266am Wed, May 13 20267am Wed, May 13 20268am Wed, May 13 20269am Wed, May 13 202610am Wed, May 13 202611am Wed, May 13 202612pm Wed, May 13 20261pm Wed, May 13 20262pm Wed, May 13 20263pm Wed, May 13 20264pm Wed, May 13 20265pm Wed, May 13 20266pm Wed, May 13 20267pm Wed, May 13 20268pm Wed, May 13 20269pm Wed, May 13 202610pm Wed, May 13 202611pm Wed, May 13 202612am Thu, May 14 20261am Thu, May 14 20262am Thu, May 14 20263am Thu, May 14 20264am Thu, May 14 20265am Thu, May 14 20266am Thu, May 14 20267am Thu, May 14 20268am Thu, May 14 20269am Thu, May 14 202610am Thu, May 14 202611am Thu, May 14 202612pm Thu, May 14 20261pm Thu, May 14 20262pm Thu, May 14 20263pm Thu, May 14 20264pm Thu, May 14 20265pm Thu, May 14 20266pm Thu, May 14 20267pm Thu, May 14 20268pm Thu, May 14 20269pm Thu, May 14 202610pm Thu, May 14 202611pm Thu, May 14 202612am Fri, May 15 20261am Fri, May 15 20262am Fri, May 15 20263am Fri, May 15 20264am Fri, May 15 20265am Fri, May 15 20266am Fri, May 15 20267am Fri, May 15 20268am Fri, May 15 20269am Fri, May 15 202610am Fri, May 15 202611am Fri, May 15 202612pm Fri, May 15 20261pm Fri, May 15 20262pm Fri, May 15 20263pm Fri, May 15 20264pm Fri, May 15 20265pm Fri, May 15 20266pm Fri, May 15 20267pm Fri, May 15 20268pm Fri, May 15 20269pm Fri, May 15 202610pm Fri, May 15 202611pm Fri, May 15 202612am Sat, May 16 2026

Date	05/11											05/12
Hour (EDT)	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12
Temperature (°F)	56	57	58	60	62	62	61	59	56	55	53	52	51	49	49	48	47	48	48	50	54	57	59	61
Dewpoint (°F)	39	40	40	39	38	37	38	40	40	40	41	41	41	40	39	39	38	37	37	38	39	38	38	38
Heat Index (°F)
Surface Wind (mph)	3	5	5	6	7	6	3	3	3	3	3	3	3	5	5	6	6	6	6	6	5	5	5	5
Wind Dir	N	N	N	NW	NW	N	NE	S	SW	W	W	NW	NW	N	N	N	N	N	N	N	N	N	N	N
Gust
Sky Cover (%)	94	92	83	67	37	32	32	37	41	41	16	9	24	25	14	9	5	5	2	4	3	5	5	2
Precipitation Potential (%)	40	19	10	4	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Relative Humidity (%)	53	53	51	46	41	39	42	49	55	57	64	66	68	71	68	71	71	65	65	63	57	49	45	42
Rain	Chc	SChc	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date												05/13
Hour (EDT)	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12
Temperature (°F)	63	65	68	68	68	69	67	65	61	59	58	57	56	55	55	55	55	56	57	58	60	63	65	67
Dewpoint (°F)	38	38	38	37	37	37	38	39	39	39	40	41	42	43	43	44	44	44	44	45	46	48	49	50
Heat Index (°F)
Surface Wind (mph)	5	5	5	3	3	5	5	5	6	7	7	8	9	10	11	11	13	14	14	15	15	15	15	15
Wind Dir	NW	NW	NW	W	SW	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S
Gust														18	21	23	24	25	25	25	25	25	25	25
Sky Cover (%)	4	4	4	3	7	9	13	38	23	34	45	52	59	66	66	65	65	67	68	70	72	74	76	80
Precipitation Potential (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	1	20	20	20	20	20
Relative Humidity (%)	39	37	33	32	32	31	34	38	44	47	51	55	59	64	64	66	66	64	62	62	60	58	56	54
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc	SChc	SChc
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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