| NWS Forecast for: Lewistown MT Issued by: National Weather Service Great Falls, MT Last Update: 12:37 pm MDT Apr 21, 2026 |  |
This Afternoon: Mostly sunny, with a high near 26. South southeast wind 8 to 11 km/h. Tonight: A slight chance of showers and thunderstorms before midnight, then a slight chance of rain between midnight and 1am. Increasing clouds, with a low around 11. South southeast wind 11 to 14 km/h. Chance of precipitation is 20%. Wednesday: A slight chance of showers and thunderstorms between 3pm and 4pm, then a chance of rain after 4pm. Mostly cloudy, then gradually becoming sunny, with a high near 22. Breezy, with a southwest wind 11 to 21 km/h increasing to 27 to 37 km/h. Winds could gust as high as 60 km/h. Chance of precipitation is 30%. Wednesday Night: Rain before 3am, then rain and snow. Low around -2. Blustery, with a west southwest wind 29 to 34 km/h increasing to 35 to 40 km/h after midnight. Winds could gust as high as 60 km/h. Chance of precipitation is 90%. New snow accumulation of less than a half centimeter possible. Thursday: Rain and snow likely, becoming all snow after 8am. Cloudy, with a high near 4. Breezy, with a west northwest wind 40 to 45 km/h, with gusts as high as 65 km/h. Chance of precipitation is 70%. New snow accumulation of 2 to 4 centimeters possible. Thursday Night: A 30 percent chance of snow. Mostly cloudy, with a low around -6. Blustery, with a west northwest wind 30 to 35 km/h decreasing to 21 to 26 km/h after midnight. Winds could gust as high as 55 km/h. New snow accumulation of less than a half centimeter possible. Friday: A 50 percent chance of snow. Mostly cloudy, with a high near 2. Northwest wind 24 to 32 km/h, with gusts as high as 50 km/h. New snow accumulation of less than one centimeter possible. Friday Night: A slight chance of snow. Mostly cloudy, with a low around -7. West wind 24 to 34 km/h decreasing to 13 to 23 km/h after midnight. Winds could gust as high as 50 km/h. Saturday: A chance of snow. Mostly cloudy, with a high near 4. Saturday Night: A slight chance of snow. Mostly cloudy, with a low around -7. Sunday: A chance of snow. Partly sunny, with a high near 5. Sunday Night: A slight chance of snow. Mostly cloudy, with a low around -5. Monday: A slight chance of rain and snow. Partly sunny, with a high near 9. | |
| Lewistown MT 47.07°N 109.43°W (Elev. 3898 m) | |
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