Point Forecast: Lewistown MT  47.07N 109.43W (Elev. 3898 ft)	Last Update: 8:34 pm MDT Jul 14, 2025

[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) Grassland Fire Danger Index Ceiling Height Visibility

48-Hour Period Starting: 10pm Mon, Jul 14 202511pm Mon, Jul 14 202512am Tue, Jul 15 20251am Tue, Jul 15 20252am Tue, Jul 15 20253am Tue, Jul 15 20254am Tue, Jul 15 20255am Tue, Jul 15 20256am Tue, Jul 15 20257am Tue, Jul 15 20258am Tue, Jul 15 20259am Tue, Jul 15 202510am Tue, Jul 15 202511am Tue, Jul 15 202512pm Tue, Jul 15 20251pm Tue, Jul 15 20252pm Tue, Jul 15 20253pm Tue, Jul 15 20254pm Tue, Jul 15 20255pm Tue, Jul 15 20256pm Tue, Jul 15 20257pm Tue, Jul 15 20258pm Tue, Jul 15 20259pm Tue, Jul 15 202510pm Tue, Jul 15 202511pm Tue, Jul 15 202512am Wed, Jul 16 20251am Wed, Jul 16 20252am Wed, Jul 16 20253am Wed, Jul 16 20254am Wed, Jul 16 20255am Wed, Jul 16 20256am Wed, Jul 16 20257am Wed, Jul 16 20258am Wed, Jul 16 20259am Wed, Jul 16 202510am Wed, Jul 16 202511am Wed, Jul 16 202512pm Wed, Jul 16 20251pm Wed, Jul 16 20252pm Wed, Jul 16 20253pm Wed, Jul 16 20254pm Wed, Jul 16 20255pm Wed, Jul 16 20256pm Wed, Jul 16 20257pm Wed, Jul 16 20258pm Wed, Jul 16 20259pm Wed, Jul 16 202510pm Wed, Jul 16 202511pm Wed, Jul 16 202512am Thu, Jul 17 20251am Thu, Jul 17 20252am Thu, Jul 17 20253am Thu, Jul 17 20254am Thu, Jul 17 20255am Thu, Jul 17 20256am Thu, Jul 17 20257am Thu, Jul 17 20258am Thu, Jul 17 20259am Thu, Jul 17 202510am Thu, Jul 17 202511am Thu, Jul 17 202512pm Thu, Jul 17 20251pm Thu, Jul 17 20252pm Thu, Jul 17 20253pm Thu, Jul 17 20254pm Thu, Jul 17 20255pm Thu, Jul 17 20256pm Thu, Jul 17 20257pm Thu, Jul 17 20258pm Thu, Jul 17 20259pm Thu, Jul 17 202510pm Thu, Jul 17 202511pm Thu, Jul 17 202512am Fri, Jul 18 20251am Fri, Jul 18 20252am Fri, Jul 18 20253am Fri, Jul 18 20254am Fri, Jul 18 20255am Fri, Jul 18 20256am Fri, Jul 18 20257am Fri, Jul 18 20258am Fri, Jul 18 20259am Fri, Jul 18 202510am Fri, Jul 18 202511am Fri, Jul 18 202512pm Fri, Jul 18 20251pm Fri, Jul 18 20252pm Fri, Jul 18 20253pm Fri, Jul 18 20254pm Fri, Jul 18 20255pm Fri, Jul 18 20256pm Fri, Jul 18 20257pm Fri, Jul 18 20258pm Fri, Jul 18 20259pm Fri, Jul 18 202510pm Fri, Jul 18 202511pm Fri, Jul 18 202512am Sat, Jul 19 20251am Sat, Jul 19 20252am Sat, Jul 19 20253am Sat, Jul 19 20254am Sat, Jul 19 20255am Sat, Jul 19 20256am Sat, Jul 19 20257am Sat, Jul 19 20258am Sat, Jul 19 20259am Sat, Jul 19 2025

Date	07/14		07/15
Hour (MDT)	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)	67	64	61	59	57	55	53	53	52	51	52	52	54	54	54	55	55	56	55	55	54	54	53	52
Dewpoint (°F)	58	57	57	56	56	55	53	53	52	51	52	52	53	52	53	53	53	54	51	51	51	51	50	51
Heat Index (°F)
Surface Wind (mph)	13	10	11	10	9	9	8	9	8	9	10	9	10	10	10	11	11	13	13	13	11	10	10	10
Wind Dir	NE	NE	NE	NE	NE	NE	ENE	ENE	ENE	E	E	E	ENE	ENE	ENE	ENE	ENE	ENE	NE	NE	NE	NE	NE	NE
Gust	22	20	20	18							18		20	20	21	21	22	23	23	23	22	21	20	20
Sky Cover (%)	65	72	72	90	97	97	96	96	96	93	92	97	97	98	97	98	100	97	95	93	94	94	94	97
Precipitation Potential (%)	31	33	47	48	51	63	62	65	71	75	79	79	79	81	95	96	99	95	92	83	90	90	90	90
Relative Humidity (%)	72	78	86	91	96	100	100	100	99	100	100	100	96	94	97	94	94	93	88	88	89	88	89	95
Rain	Chc	Chc	Chc	Chc	Chc	Lkly	Lkly	Lkly	Lkly	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl
Thunder	Chc	Chc	Chc	Chc	Chc	--	--	--	--	--	--	SChc	SChc	SChc	Chc	Chc	Chc	Chc	Chc	Chc	SChc	SChc	SChc	--
Date			07/16
Hour (MDT)	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)	50	50	49	49	48	48	47	46	46	47	49	51	52	53	55	57	60	62	63	64	63	61	59	56
Dewpoint (°F)	50	50	49	48	48	48	47	46	46	47	48	49	49	49	49	49	50	50	49	49	49	49	49	49
Heat Index (°F)
Surface Wind (mph)	10	10	8	8	8	6	6	6	6	6	6	6	6	6	7	7	7	9	9	9	9	9	9	8
Wind Dir	NE	NE	NE	NE	NE	ENE	ENE	ENE	ENE	ENE	ENE	E	E	E	E	E	E	ESE	ESE	ESE	ESE	ESE	ESE	ESE
Gust	18
Sky Cover (%)	98	98	97	97	97	93	93	93	87	87	87	70	70	70	70	70	70	57	57	57	44	44	44	33
Precipitation Potential (%)	90	90	75	75	75	75	75	75	52	52	52	52	52	52	36	36	36	36	36	36	8	8	8	8
Relative Humidity (%)	100	99	99	99	100	100	100	100	100	99	97	94	90	85	80	75	69	65	61	59	60	64	70	77
Rain	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

International System of Units Forecast Discussion 7-Day Forecast Hourly Weather Graph