Point Forecast: 2 Miles ESE Great Falls VA  39N 77.26W (Elev. 259 ft)	Last Update: 9:28 pm EDT Oct 9, 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: 10pm Fri, Oct 9 202611pm Fri, Oct 9 202612am Sat, Oct 10 20261am Sat, Oct 10 20262am Sat, Oct 10 20263am Sat, Oct 10 20264am Sat, Oct 10 20265am Sat, Oct 10 20266am Sat, Oct 10 20267am Sat, Oct 10 20268am Sat, Oct 10 20269am Sat, Oct 10 202610am Sat, Oct 10 202611am Sat, Oct 10 202612pm Sat, Oct 10 20261pm Sat, Oct 10 20262pm Sat, Oct 10 20263pm Sat, Oct 10 20264pm Sat, Oct 10 20265pm Sat, Oct 10 20266pm Sat, Oct 10 20267pm Sat, Oct 10 20268pm Sat, Oct 10 20269pm Sat, Oct 10 202610pm Sat, Oct 10 202611pm Sat, Oct 10 202612am Sun, Oct 11 20261am Sun, Oct 11 20262am Sun, Oct 11 20263am Sun, Oct 11 20264am Sun, Oct 11 20265am Sun, Oct 11 20266am Sun, Oct 11 20267am Sun, Oct 11 20268am Sun, Oct 11 20269am Sun, Oct 11 202610am Sun, Oct 11 202611am Sun, Oct 11 202612pm Sun, Oct 11 20261pm Sun, Oct 11 20262pm Sun, Oct 11 20263pm Sun, Oct 11 20264pm Sun, Oct 11 20265pm Sun, Oct 11 20266pm Sun, Oct 11 20267pm Sun, Oct 11 20268pm Sun, Oct 11 20269pm Sun, Oct 11 202610pm Sun, Oct 11 202611pm Sun, Oct 11 202612am Mon, Oct 12 20261am Mon, Oct 12 20262am Mon, Oct 12 20263am Mon, Oct 12 20264am Mon, Oct 12 20265am Mon, Oct 12 20266am Mon, Oct 12 20267am Mon, Oct 12 20268am Mon, Oct 12 20269am Mon, Oct 12 202610am Mon, Oct 12 202611am Mon, Oct 12 202612pm Mon, Oct 12 20261pm Mon, Oct 12 20262pm Mon, Oct 12 20263pm Mon, Oct 12 20264pm Mon, Oct 12 20265pm Mon, Oct 12 20266pm Mon, Oct 12 20267pm Mon, Oct 12 20268pm Mon, Oct 12 20269pm Mon, Oct 12 202610pm Mon, Oct 12 202611pm Mon, Oct 12 202612am Tue, Oct 13 20261am Tue, Oct 13 20262am Tue, Oct 13 20263am Tue, Oct 13 20264am Tue, Oct 13 20265am Tue, Oct 13 20266am Tue, Oct 13 20267am Tue, Oct 13 20268am Tue, Oct 13 20269am Tue, Oct 13 202610am Tue, Oct 13 202611am Tue, Oct 13 202612pm Tue, Oct 13 20261pm Tue, Oct 13 20262pm Tue, Oct 13 20263pm Tue, Oct 13 20264pm Tue, Oct 13 20265pm Tue, Oct 13 20266pm Tue, Oct 13 20267pm Tue, Oct 13 20268pm Tue, Oct 13 20269pm Tue, Oct 13 202610pm Tue, Oct 13 202611pm Tue, Oct 13 202612am Wed, Oct 14 20261am Wed, Oct 14 20262am Wed, Oct 14 20263am Wed, Oct 14 20264am Wed, Oct 14 20265am Wed, Oct 14 20266am Wed, Oct 14 20267am Wed, Oct 14 20268am Wed, Oct 14 20269am Wed, Oct 14 2026

Date	10/09		10/10
Hour (EDT)	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21
Temperature (°F)	59	58	57	55	55	54	53	53	53	52	53	57	62	66	68	70	70	70	71	70	69	67	64	63
Dewpoint (°F)	53	50	50	49	49	48	48	47	47	47	48	50	51	51	50	50	49	49	50	51	51	52	55	55
Heat Index (°F)
Surface Wind (mph)	1	1	1	0	1	1	1	1	2	2	2	3	3	6	7	7	8	8	8	8	7	7	7	7
Wind Dir	N	N	N	N	NE	NE	NE	N	N	N	N	NE	E	E	E	E	E	E	E	E	E	E	E	E
Gust
Sky Cover (%)	89	79	72	74	61	59	66	43	72	69	74	72	86	80	83	79	79	81	68	92	82	68	80	84
Precipitation Potential (%)	0	0	0	0	0	0	0	0	0	0	1	1	1	0	0	1	0	0	0	1	1	1	14	10
Relative Humidity (%)	80	75	77	80	80	80	83	80	80	83	83	77	67	58	52	49	47	47	47	51	53	59	73	75
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date			10/11
Hour (EDT)	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21
Temperature (°F)	62	61	61	60	60	59	59	59	59	60	60	62	63	64	65	65	66	66	67	67	67	67	67	67
Dewpoint (°F)	56	57	57	58	58	58	59	59	59	60	60	62	63	64	65	65	66	66	67	67	67	67	67	67
Heat Index (°F)
Surface Wind (mph)	6	6	7	7	7	8	9	10	11	13	13	14	14	13	13	14	14	14	13	11	10	8	7	6
Wind Dir	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E
Gust								18	20	21	22	23	24	25	26	29	29	28	26	24	21	18
Sky Cover (%)	92	94	89	86	87	86	90	95	93	93	100	100	100	100	100	100	99	99	99	99	99	99	91	90
Precipitation Potential (%)	6	2	11	20	29	39	49	59	69	89	99	99	99	99	99	99	98	98	98	98	98	98	73	73
Relative Humidity (%)	81	87	87	93	93	96	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100
Rain	--	--	--	SChc	Chc	Chc	Chc	Lkly	Lkly	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Lkly	Lkly
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc	SChc	SChc

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