Point Forecast: Great Falls VA  39.01N 77.29W (Elev. 106 m)	Last Update: 10:31 am EDT Jul 20, 2025

[hide menu]

Weather Elements Fire Weather Aviation Weather Temperature (°C) Dewpoint (°C) Heat Index (°C) 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-m) Atmospheric Dispersion Index Low Visibility Occurrence Risk Index Ceiling Height Visibility

48-Hour Period Starting: 1pm Sun, Jul 20 20252pm Sun, Jul 20 20253pm Sun, Jul 20 20254pm Sun, Jul 20 20255pm Sun, Jul 20 20256pm Sun, Jul 20 20257pm Sun, Jul 20 20258pm Sun, Jul 20 20259pm Sun, Jul 20 202510pm Sun, Jul 20 202511pm Sun, Jul 20 202512am Mon, Jul 21 20251am Mon, Jul 21 20252am Mon, Jul 21 20253am Mon, Jul 21 20254am Mon, Jul 21 20255am Mon, Jul 21 20256am Mon, Jul 21 20257am Mon, Jul 21 20258am Mon, Jul 21 20259am Mon, Jul 21 202510am Mon, Jul 21 202511am Mon, Jul 21 202512pm Mon, Jul 21 20251pm Mon, Jul 21 20252pm Mon, Jul 21 20253pm Mon, Jul 21 20254pm Mon, Jul 21 20255pm Mon, Jul 21 20256pm Mon, Jul 21 20257pm Mon, Jul 21 20258pm Mon, Jul 21 20259pm Mon, Jul 21 202510pm Mon, Jul 21 202511pm Mon, Jul 21 202512am Tue, Jul 22 20251am Tue, Jul 22 20252am Tue, Jul 22 20253am Tue, Jul 22 20254am Tue, Jul 22 20255am Tue, Jul 22 20256am Tue, Jul 22 20257am Tue, Jul 22 20258am Tue, Jul 22 20259am Tue, Jul 22 202510am Tue, Jul 22 202511am Tue, Jul 22 202512pm Tue, Jul 22 20251pm Tue, Jul 22 20252pm Tue, Jul 22 20253pm Tue, Jul 22 20254pm Tue, Jul 22 20255pm Tue, Jul 22 20256pm Tue, Jul 22 20257pm Tue, Jul 22 20258pm Tue, Jul 22 20259pm Tue, Jul 22 202510pm Tue, Jul 22 202511pm Tue, Jul 22 202512am Wed, Jul 23 20251am Wed, Jul 23 20252am Wed, Jul 23 20253am Wed, Jul 23 20254am Wed, Jul 23 20255am Wed, Jul 23 20256am Wed, Jul 23 20257am Wed, Jul 23 20258am Wed, Jul 23 20259am Wed, Jul 23 202510am Wed, Jul 23 202511am Wed, Jul 23 202512pm Wed, Jul 23 20251pm Wed, Jul 23 20252pm Wed, Jul 23 20253pm Wed, Jul 23 20254pm Wed, Jul 23 20255pm Wed, Jul 23 20256pm Wed, Jul 23 20257pm Wed, Jul 23 20258pm Wed, Jul 23 20259pm Wed, Jul 23 202510pm Wed, Jul 23 202511pm Wed, Jul 23 202512am Thu, Jul 24 20251am Thu, Jul 24 20252am Thu, Jul 24 20253am Thu, Jul 24 20254am Thu, Jul 24 20255am Thu, Jul 24 20256am Thu, Jul 24 20257am Thu, Jul 24 20258am Thu, Jul 24 20259am Thu, Jul 24 202510am Thu, Jul 24 202511am Thu, Jul 24 202512pm Thu, Jul 24 20251pm Thu, Jul 24 20252pm Thu, Jul 24 20253pm Thu, Jul 24 20254pm Thu, Jul 24 20255pm Thu, Jul 24 20256pm Thu, Jul 24 20257pm Thu, Jul 24 20258pm Thu, Jul 24 20259pm Thu, Jul 24 202510pm Thu, Jul 24 202511pm Thu, Jul 24 202512am Fri, Jul 25 2025

Date	07/20											07/21
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 (°C)	30	30	31	31	31	31	29	28	27	27	26	26	25	24	24	23	23	22	22	23	24	25	26	27
Dewpoint (°C)	24	24	24	23	23	23	23	22	22	22	22	22	21	21	21	20	20	19	20	20	20	20	19	19
Heat Index (°C)	35	35	36	36	35	34	33	31	29	28	26	26	25	24	24						24	25	26	28
Surface Wind (mph)	9	9	9	10	9	9	8	7	7	7	7	7	6	6	6	6	6	6	6	6	6	6	6	6
Wind Dir	W	W	W	W	W	W	W	W	W	NW	NW	NW	NW	NW	NW	NW	NW	N	N	N	N	N	N	N
Gust
Sky Cover (%)	58	53	42	42	24	23	26	34	23	31	28	35	41	48	44	43	45	44	46	48	59	59	59	48
Precipitation Potential (%)	14	20	19	24	11	12	12	8	7	6	6	6	6	4	4	4	4	4	7	5	5	5	5	5
Relative Humidity (%)	70	70	68	63	65	63	67	70	72	74	77	79	79	82	82	82	84	84	87	84	79	74	69	62
Rain	--	SChc	SChc	SChc	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	SChc	SChc	SChc	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date												07/22
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 (°C)	27	28	28	28	28	27	27	26	24	23	22	22	21	21	19	19	18	18	19	19	21	22	23	24
Dewpoint (°C)	19	18	18	18	17	17	17	17	17	17	17	16	15	14	13	13	12	12	13	13	14	14	15	16
Heat Index (°C)	28	29	29	29	28	28	27	26	24															24
Surface Wind (mph)	6	6	6	6	6	5	5	3	3	3	3	3	5	5	5	6	6	6	6	6	6	5	5	5
Wind Dir	N	N	N	N	N	N	N	NE	NE	NE	NE	NE	NE	NE	NE	NE	NE	NE	N	N	NE	NE	NE	NE
Gust
Sky Cover (%)	37	26	25	25	24	25	26	27	26	24	23	20	16	13	14	16	17	19	21	23	25	28	30	24
Precipitation Potential (%)	5	8	8	8	8	8	8	6	6	6	6	6	6	4	4	4	4	4	4	3	3	3	3	3
Relative Humidity (%)	60	56	53	53	53	54	56	60	64	69	71	71	68	68	68	68	68	68	68	68	66	63	59	58
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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