| NWS Forecast for: St Mary MT Issued by: National Weather Service Great Falls, MT Last Update: 12:31 pm MDT Sep 7, 2026 |  |
Tonight: Showers. Patchy fog after 2am. Low around 39. Southwest wind 7 to 11 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible. Tuesday: Showers likely, mainly before noon. Patchy fog before 11am. Otherwise, cloudy, with a high near 55. West southwest wind 7 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. Tuesday Night: Partly cloudy, with a low around 41. West southwest wind around 9 mph, with gusts as high as 22 mph. Wednesday: Sunny, with a high near 63. West southwest wind 11 to 16 mph, with gusts as high as 31 mph. Wednesday Night: Partly cloudy, with a low around 48. West southwest wind 15 to 18 mph, with gusts as high as 41 mph. Thursday: Mostly sunny, with a high near 64. West southwest wind 14 to 17 mph, with gusts as high as 39 mph. Thursday Night: A chance of showers and thunderstorms, then showers likely after midnight. Mostly cloudy, with a low around 38. West southwest wind 6 to 11 mph becoming light and variable after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%. Friday: Showers likely and possibly a thunderstorm before noon, then a chance of showers. Mostly cloudy, with a high near 51. Calm wind becoming northeast around 6 mph in the afternoon. Friday Night: Showers likely, mainly after midnight. Mostly cloudy, with a low around 34. Saturday: Showers likely. Cloudy, with a high near 47. Saturday Night: Rain and snow showers likely. Mostly cloudy, with a low around 32. Sunday: A chance of rain and snow showers. Partly sunny, with a high near 50. Sunday Night: A chance of showers. Mostly cloudy, with a low around 33. Monday: A chance of showers. Mostly sunny, with a high near 56. | |
| St Mary MT 48.74°N 113.44°W (Elev. 4554 ft) | |
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