Point Forecast: Fairfax VA  38.85N 77.29W (Elev. 400 ft)	Last Update: 4:53 am EDT Aug 9, 2026

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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: 7am Sun, Aug 9 20268am Sun, Aug 9 20269am Sun, Aug 9 202610am Sun, Aug 9 202611am Sun, Aug 9 202612pm Sun, Aug 9 20261pm Sun, Aug 9 20262pm Sun, Aug 9 20263pm Sun, Aug 9 20264pm Sun, Aug 9 20265pm Sun, Aug 9 20266pm Sun, Aug 9 20267pm Sun, Aug 9 20268pm Sun, Aug 9 20269pm Sun, Aug 9 202610pm Sun, Aug 9 202611pm Sun, Aug 9 202612am Mon, Aug 10 20261am Mon, Aug 10 20262am Mon, Aug 10 20263am Mon, Aug 10 20264am Mon, Aug 10 20265am Mon, Aug 10 20266am Mon, Aug 10 20267am Mon, Aug 10 20268am Mon, Aug 10 20269am Mon, Aug 10 202610am Mon, Aug 10 202611am Mon, Aug 10 202612pm Mon, Aug 10 20261pm Mon, Aug 10 20262pm Mon, Aug 10 20263pm Mon, Aug 10 20264pm Mon, Aug 10 20265pm Mon, Aug 10 20266pm Mon, Aug 10 20267pm Mon, Aug 10 20268pm Mon, Aug 10 20269pm Mon, Aug 10 202610pm Mon, Aug 10 202611pm Mon, Aug 10 202612am Tue, Aug 11 20261am Tue, Aug 11 20262am Tue, Aug 11 20263am Tue, Aug 11 20264am Tue, Aug 11 20265am Tue, Aug 11 20266am Tue, Aug 11 20267am Tue, Aug 11 20268am Tue, Aug 11 20269am Tue, Aug 11 202610am Tue, Aug 11 202611am Tue, Aug 11 202612pm Tue, Aug 11 20261pm Tue, Aug 11 20262pm Tue, Aug 11 20263pm Tue, Aug 11 20264pm Tue, Aug 11 20265pm Tue, Aug 11 20266pm Tue, Aug 11 20267pm Tue, Aug 11 20268pm Tue, Aug 11 20269pm Tue, Aug 11 202610pm Tue, Aug 11 202611pm Tue, Aug 11 202612am Wed, Aug 12 20261am Wed, Aug 12 20262am Wed, Aug 12 20263am Wed, Aug 12 20264am Wed, Aug 12 20265am Wed, Aug 12 20266am Wed, Aug 12 20267am Wed, Aug 12 20268am Wed, Aug 12 20269am Wed, Aug 12 202610am Wed, Aug 12 202611am Wed, Aug 12 202612pm Wed, Aug 12 20261pm Wed, Aug 12 20262pm Wed, Aug 12 20263pm Wed, Aug 12 20264pm Wed, Aug 12 20265pm Wed, Aug 12 20266pm Wed, Aug 12 20267pm Wed, Aug 12 20268pm Wed, Aug 12 20269pm Wed, Aug 12 202610pm Wed, Aug 12 202611pm Wed, Aug 12 202612am Thu, Aug 13 20261am Thu, Aug 13 20262am Thu, Aug 13 20263am Thu, Aug 13 20264am Thu, Aug 13 20265am Thu, Aug 13 20266am Thu, Aug 13 20267am Thu, Aug 13 20268am Thu, Aug 13 20269am Thu, Aug 13 202610am Thu, Aug 13 202611am Thu, Aug 13 202612pm Thu, Aug 13 20261pm Thu, Aug 13 20262pm Thu, Aug 13 20263pm Thu, Aug 13 20264pm Thu, Aug 13 20265pm Thu, Aug 13 20266pm Thu, Aug 13 2026

Date	08/09																	08/10
Hour (EDT)	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06
Temperature (°F)	73	76	78	82	85	87	88	89	90	91	89	89	88	84	82	80	78	77	76	75	74	74	73	72
Dewpoint (°F)	70	72	72	72	72	72	71	71	70	69	68	69	69	70	69	69	69	69	69	69	69	68	67	67
Heat Index (°F)		76	78	87	91	94	94	95	96	96	93	94	92	88	85	83	78	77	76	75
Surface Wind (mph)	3	3	5	6	7	6	6	6	6	6	5	3	2	1	1	1	1	0	1	1	1	1	2	2
Wind Dir	W	W	NW	NW	NW	NW	W	W	W	W	W	W	SW	SW	SW	SW	SW	W	W	W	NW	NW	NW	NW
Gust
Sky Cover (%)	70	54	55	49	40	34	30	22	26	26	31	28	25	26	24	24	23	22	21	22	19	17	16	20
Precipitation Potential (%)	0	0	1	1	1	1	1	3	4	4	4	4	4	2	1	0	0	0	0	0	0	0	0	0
Relative Humidity (%)	90	87	82	72	65	61	57	56	52	49	50	52	54	63	65	69	74	76	79	82	84	82	81	84
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date																		08/11
Hour (EDT)	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06
Temperature (°F)	73	74	78	83	86	89	90	91	92	91	90	88	85	83	81	80	79	78	77	76	75	74	74	74
Dewpoint (°F)	67	69	70	72	72	72	72	72	72	72	72	72	73	73	72	72	72	72	72	72	72	71	71	71
Heat Index (°F)			78	88	92	96	97	99	100	99	97	95	92	89	85	84	79	78	77	76	75
Surface Wind (mph)	2	1	2	3	5	6	7	8	8	9	9	8	7	5	5	5	3	3	3	3	3	3	3	3
Wind Dir	NW	NW	W	W	W	W	SW	SW	SW	W	SW	W	W	SW	SW	W	W	W	W	NW	NW	NW	NW	NW
Gust
Sky Cover (%)	27	18	0	9	18	21	25	47	47	47	49	47	57	72	46	47	52	52	52	52	50	48	46	49
Precipitation Potential (%)	2	3	3	3	3	3	3	24	24	24	24	24	24	23	23	23	23	23	23	3	3	3	3	3
Relative Humidity (%)	81	84	76	70	63	57	56	54	52	54	56	59	67	72	74	77	79	82	85	87	90	90	90	90
Rain	--	--	--	--	--	--	--	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	--	--	--	--	--	--	--	--

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