Point Forecast: Great Falls VA  39.01N 77.29W (Elev. 348 ft)	Last Update: 4:29 pm EDT Jun 21, 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: 6pm Sat, Jun 21 20257pm Sat, Jun 21 20258pm Sat, Jun 21 20259pm Sat, Jun 21 202510pm Sat, Jun 21 202511pm Sat, Jun 21 202512am Sun, Jun 22 20251am Sun, Jun 22 20252am Sun, Jun 22 20253am Sun, Jun 22 20254am Sun, Jun 22 20255am Sun, Jun 22 20256am Sun, Jun 22 20257am Sun, Jun 22 20258am Sun, Jun 22 20259am Sun, Jun 22 202510am Sun, Jun 22 202511am Sun, Jun 22 202512pm Sun, Jun 22 20251pm Sun, Jun 22 20252pm Sun, Jun 22 20253pm Sun, Jun 22 20254pm Sun, Jun 22 20255pm Sun, Jun 22 20256pm Sun, Jun 22 20257pm Sun, Jun 22 20258pm Sun, Jun 22 20259pm Sun, Jun 22 202510pm Sun, Jun 22 202511pm Sun, Jun 22 202512am Mon, Jun 23 20251am Mon, Jun 23 20252am Mon, Jun 23 20253am Mon, Jun 23 20254am Mon, Jun 23 20255am Mon, Jun 23 20256am Mon, Jun 23 20257am Mon, Jun 23 20258am Mon, Jun 23 20259am Mon, Jun 23 202510am Mon, Jun 23 202511am Mon, Jun 23 202512pm Mon, Jun 23 20251pm Mon, Jun 23 20252pm Mon, Jun 23 20253pm Mon, Jun 23 20254pm Mon, Jun 23 20255pm Mon, Jun 23 20256pm Mon, Jun 23 20257pm Mon, Jun 23 20258pm Mon, Jun 23 20259pm Mon, Jun 23 202510pm Mon, Jun 23 202511pm Mon, Jun 23 202512am Tue, Jun 24 20251am Tue, Jun 24 20252am Tue, Jun 24 20253am Tue, Jun 24 20254am Tue, Jun 24 20255am Tue, Jun 24 20256am Tue, Jun 24 20257am Tue, Jun 24 20258am Tue, Jun 24 20259am Tue, Jun 24 202510am Tue, Jun 24 202511am Tue, Jun 24 202512pm Tue, Jun 24 20251pm Tue, Jun 24 20252pm Tue, Jun 24 20253pm Tue, Jun 24 20254pm Tue, Jun 24 20255pm Tue, Jun 24 20256pm Tue, Jun 24 20257pm Tue, Jun 24 20258pm Tue, Jun 24 20259pm Tue, Jun 24 202510pm Tue, Jun 24 202511pm Tue, Jun 24 202512am Wed, Jun 25 20251am Wed, Jun 25 20252am Wed, Jun 25 20253am Wed, Jun 25 20254am Wed, Jun 25 20255am Wed, Jun 25 20256am Wed, Jun 25 20257am Wed, Jun 25 20258am Wed, Jun 25 20259am Wed, Jun 25 202510am Wed, Jun 25 202511am Wed, Jun 25 202512pm Wed, Jun 25 20251pm Wed, Jun 25 20252pm Wed, Jun 25 20253pm Wed, Jun 25 20254pm Wed, Jun 25 20255pm Wed, Jun 25 20256pm Wed, Jun 25 20257pm Wed, Jun 25 20258pm Wed, Jun 25 20259pm Wed, Jun 25 202510pm Wed, Jun 25 202511pm Wed, Jun 25 202512am Thu, Jun 26 20251am Thu, Jun 26 20252am Thu, Jun 26 20253am Thu, Jun 26 20254am Thu, Jun 26 20255am Thu, Jun 26 2025

Date	06/21						06/22
Hour (EDT)	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17
Temperature (°F)	88	87	84	81	79	78	76	75	74	73	72	71	71	72	75	79	84	87	89	91	94	94	95	96
Dewpoint (°F)	65	66	67	67	67	68	68	68	67	66	67	66	66	67	69	70	71	70	70	71	70	70	70	70
Heat Index (°F)	90	89	87	83	79	78	76	75							75	79	89	92	94	98	100	100	102	103
Surface Wind (mph)	7	7	5	5	5	6	6	6	6	6	6	6	5	6	6	6	5	5	5	6	6	7	7	7
Wind Dir	S	S	S	S	S	S	S	S	S	S	SW	SW	SW	SW	SW	SW	SW	W	W	W	W	SW	SW	SW
Gust
Sky Cover (%)	39	37	42	29	16	16	18	11	7	6	13	17	7	2	1	4	12	21	21	25	30	36	35	34
Precipitation Potential (%)	1	1	1	2	2	1	1	2	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	1
Relative Humidity (%)	47	50	57	63	67	71	76	79	79	79	84	84	84	84	82	74	65	57	54	52	46	46	45	43
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date							06/23
Hour (EDT)	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17
Temperature (°F)	94	93	91	87	84	83	82	80	78	76	75	75	76	77	79	83	87	90	93	95	96	97	98	97
Dewpoint (°F)	70	70	71	71	71	71	71	71	71	71	71	71	72	73	74	75	76	75	75	74	73	72	71	71
Heat Index (°F)	100	99	98	93	89	88	86	83	78	76	75	75	76	77	79	90	98	101	105	106	106	106	106	105
Surface Wind (mph)	7	6	6	6	5	5	3	3	3	3	2	2	2	3	3	3	5	5	5	6	6	6	5	5
Wind Dir	SW	SW	SW	SW	SW	SW	W	W	W	W	W	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW	NW
Gust
Sky Cover (%)	35	34	39	29	18	8	7	7	6	6	6	6	6	5	5	6	6	7	10	12	15	16	16	17
Precipitation Potential (%)	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1
Relative Humidity (%)	46	47	52	59	65	67	69	74	79	85	87	87	87	87	85	77	70	62	56	51	48	45	42	43
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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