Point Forecast: Lewistown MT  47.07N 109.43W (Elev. 1188 m)	Last Update: 4:38 pm MDT Apr 21, 2026

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Weather Elements Fire Weather Aviation Weather Temperature (°C) Dewpoint (°C) Wind Chill (°C) Surface Wind  ktmphkm/hm/s Sky Cover (%) Precipitation Potential (%) Relative Humidity (%) Rain Thunder Snow Freezing Rain Sleet Fog Mixing Height  x100ftx100m Trans. Wind  ktmphkm/hm/s Vent Rate (x1000 mph-m) Grassland Fire Danger Index Ceiling Height Visibility

48-Hour Period Starting: 8pm Tue, Apr 21 20269pm Tue, Apr 21 202610pm Tue, Apr 21 202611pm Tue, Apr 21 202612am Wed, Apr 22 20261am Wed, Apr 22 20262am Wed, Apr 22 20263am Wed, Apr 22 20264am Wed, Apr 22 20265am Wed, Apr 22 20266am Wed, Apr 22 20267am Wed, Apr 22 20268am Wed, Apr 22 20269am Wed, Apr 22 202610am Wed, Apr 22 202611am Wed, Apr 22 202612pm Wed, Apr 22 20261pm Wed, Apr 22 20262pm Wed, Apr 22 20263pm Wed, Apr 22 20264pm Wed, Apr 22 20265pm Wed, Apr 22 20266pm Wed, Apr 22 20267pm Wed, Apr 22 20268pm Wed, Apr 22 20269pm Wed, Apr 22 202610pm Wed, Apr 22 202611pm Wed, Apr 22 202612am Thu, Apr 23 20261am Thu, Apr 23 20262am Thu, Apr 23 20263am Thu, Apr 23 20264am Thu, Apr 23 20265am Thu, Apr 23 20266am Thu, Apr 23 20267am Thu, Apr 23 20268am Thu, Apr 23 20269am Thu, Apr 23 202610am Thu, Apr 23 202611am Thu, Apr 23 202612pm Thu, Apr 23 20261pm Thu, Apr 23 20262pm Thu, Apr 23 20263pm Thu, Apr 23 20264pm Thu, Apr 23 20265pm Thu, Apr 23 20266pm Thu, Apr 23 20267pm Thu, Apr 23 20268pm Thu, Apr 23 20269pm Thu, Apr 23 202610pm Thu, Apr 23 202611pm Thu, Apr 23 202612am Fri, Apr 24 20261am Fri, Apr 24 20262am Fri, Apr 24 20263am Fri, Apr 24 20264am Fri, Apr 24 20265am Fri, Apr 24 20266am Fri, Apr 24 20267am Fri, Apr 24 20268am Fri, Apr 24 20269am Fri, Apr 24 202610am Fri, Apr 24 202611am Fri, Apr 24 202612pm Fri, Apr 24 20261pm Fri, Apr 24 20262pm Fri, Apr 24 20263pm Fri, Apr 24 20264pm Fri, Apr 24 20265pm Fri, Apr 24 20266pm Fri, Apr 24 20267pm Fri, Apr 24 20268pm Fri, Apr 24 20269pm Fri, Apr 24 202610pm Fri, Apr 24 202611pm Fri, Apr 24 202612am Sat, Apr 25 20261am Sat, Apr 25 20262am Sat, Apr 25 20263am Sat, Apr 25 20264am Sat, Apr 25 20265am Sat, Apr 25 20266am Sat, Apr 25 20267am Sat, Apr 25 20268am Sat, Apr 25 20269am Sat, Apr 25 202610am Sat, Apr 25 202611am Sat, Apr 25 202612pm Sat, Apr 25 20261pm Sat, Apr 25 20262pm Sat, Apr 25 20263pm Sat, Apr 25 20264pm Sat, Apr 25 20265pm Sat, Apr 25 20266pm Sat, Apr 25 20267pm Sat, Apr 25 20268pm Sat, Apr 25 20269pm Sat, Apr 25 202610pm Sat, Apr 25 202611pm Sat, Apr 25 202612am Sun, Apr 26 20261am Sun, Apr 26 20262am Sun, Apr 26 20263am Sun, Apr 26 20264am Sun, Apr 26 20265am Sun, Apr 26 20266am Sun, Apr 26 20267am Sun, Apr 26 2026

Date	04/21				04/22
Hour (MDT)	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19
Temperature (°C)	21	18	17	16	15	15	14	13	13	13	12	13	14	17	19	20	21	21	20	20	19	18	16	14
Dewpoint (°C)	2	1	1	0	-1	0	1	1	1	1	0	1	1	1	1	-2	-4	-3	-4	-4	-5	-3	-2	-1
Wind Chill (°C)
Surface Wind (mph)	8	9	9	8	9	9	8	8	8	7	7	8	10	11	15	18	23	22	22	22	21	20	18	18
Wind Dir	SE	SE	SE	SSE	SSE	SSE	SSE	SSE	S	S	S	S	SSW	SW	SW	SW	SW	SW	SW	SW	SW	WSW	WSW	WSW
Gust																	32	33	34	36	33	30
Sky Cover (%)	74	66	46	51	68	85	88	81	85	84	71	69	51	41	18	26	29	32	34	30	53	56	78	78
Precipitation Potential (%)	11	7	10	13	16	13	8	5	3	1	0	0	0	0	3	6	9	12	14	17	29	34	66	66
Relative Humidity (%)	27	31	34	34	34	36	38	42	43	44	45	43	40	34	28	23	19	19	20	19	19	24	29	37
Rain	--	--	--	--	SChc	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	Chc	Chc	Lkly	Lkly
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	--	--	--	--
Snow	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Freezing Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Sleet	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date					04/23
Hour (MDT)	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19
Temperature (°C)	11	9	8	7	6	5	4	3	2	1	0	-1	-1	-1	0	1	2	3	3	3	3	3	2	1
Dewpoint (°C)	0	1	1	1	1	1	1	0	0	-1	-1	-2	-3	-3	-3	-3	-3	-3	-3	-4	-4	-4	-4	-5
Wind Chill (°C)		6	4	2	1	0	-2	-4	-5	-7	-8	-8	-9	-8	-8	-6	-6	-4	-4	-4	-4	-4	-4	-6
Surface Wind (mph)	18	18	18	18	21	21	21	25	25	25	26	26	26	28	28	28	26	26	26	25	25	25	22	22
Wind Dir	WSW	W	W	W	W	W	W	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	NW	NW	NW	NW	NW
Gust		29	29	29	32	32	32	37	37	37	39	39	39	40	40	40	38	38	38	38	38	38	34	34
Sky Cover (%)	78	78	78	78	96	96	96	96	96	96	93	93	93	94	94	94	83	83	83	80	80	80	77	77
Precipitation Potential (%)	66	66	66	66	93	93	93	93	93	93	74	74	74	74	74	74	45	45	45	45	45	45	30	30
Relative Humidity (%)	47	53	60	66	72	76	80	83	87	90	91	91	89	86	81	75	70	66	63	61	60	60	61	64
Rain	Lkly	Lkly	Lkly	Lkly	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Lkly	Lkly	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Snow	--	--	--	--	--	--	--	Ocnl	Ocnl	Ocnl	Lkly	Lkly	Lkly	Lkly	Lkly	Lkly	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc
Freezing Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Sleet	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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