| National Weather Service Forecast for:
Lewistown MT Issued by: National Weather Service Great Falls, MT |
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| Updated: 2:27 pm MDT Mar 19, 2026 | ||||||||||||||||||
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| This Afternoon |
Mostly sunny, with a high near 70. Breezy, with a west wind 21 to 25 mph, with gusts as high as 40 mph. |
| Tonight |
Mostly clear, with a low around 45. West southwest wind 10 to 18 mph, with gusts as high as 31 mph. |
| Friday |
Mostly sunny, with a high near 74. Breezy, with a west wind 10 to 15 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 39 mph. |
| Friday Night |
Mostly cloudy, with a low around 44. Southwest wind 7 to 16 mph, with gusts as high as 30 mph. |
| Saturday |
A 50 percent chance of rain after noon. Mostly cloudy, with a high near 61. West southwest wind 6 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph. |
| Saturday Night |
A 30 percent chance of rain before midnight. Partly cloudy, with a low around 28. Northwest wind 6 to 14 mph, with gusts as high as 25 mph. |
| Sunday |
Sunny, with a high near 51. West northwest wind 6 to 11 mph, with gusts as high as 21 mph. |
| Sunday Night |
Mostly cloudy, with a low around 29. Northwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 18 mph. |
| Monday |
Mostly cloudy, with a high near 56. |
| Monday Night |
Mostly cloudy, with a low around 31. |
| Tuesday |
Mostly cloudy, with a high near 57. |
| Tuesday Night |
A slight chance of rain. Mostly cloudy, with a low around 36. |
| Wednesday |
A slight chance of rain. Partly sunny, with a high near 58. Breezy. |
Forecast from NOAA-NWS for Lewistown MT.
