| NWS Forecast for: Lewistown MT Issued by: National Weather Service Great Falls, MT Last Update: 12:31 pm MDT Apr 18, 2026 | |
| This Afternoon: Sunny, with a high near 12. West northwest wind 16 to 21 km/h, with gusts as high as 35 km/h. Tonight: Partly cloudy, with a low around -2. Northwest wind 5 to 13 km/h becoming southeast after midnight. Sunday: Sunny, with a high near 19. Calm wind becoming west 5 to 10 km/h in the afternoon. Sunday Night: Partly cloudy, with a low around 4. West wind 10 to 13 km/h becoming south in the evening. Monday: Mostly sunny, with a high near 22. Southwest wind 8 to 10 km/h becoming northwest in the afternoon. Monday Night: Partly cloudy, with a low around 7. North wind 8 to 10 km/h becoming south after midnight. Tuesday: Mostly sunny, with a high near 26. South wind 8 to 11 km/h. Tuesday Night: Partly cloudy, with a low around 10. South southeast wind 11 to 14 km/h. Wednesday: A chance of rain after noon. Partly sunny, with a high near 22. Wednesday Night: Rain showers before midnight, then rain between midnight and 3am, then rain and snow after 3am. Some thunder is also possible. Cloudy, with a low around -2. Blustery. Thursday: Snow. Mostly cloudy, with a high near 4. Windy. Thursday Night: A chance of snow. Mostly cloudy, with a low around -6. Blustery. Friday: A chance of snow. Partly sunny, with a high near 5. | |
| Lewistown MT 47.07°N 109.43°W (Elev. 3898 m) | |
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