| NWS Forecast for: St Mary MT Issued by: National Weather Service Great Falls, MT Last Update: 11:27 am MDT Jul 3, 2025 |  |
| This Afternoon: Sunny, with a high near 24. Southwest wind around 24 km/h, with gusts as high as 55 km/h. Tonight: Mostly clear, with a low around 7. West southwest wind 18 to 23 km/h becoming light and variable after midnight. Winds could gust as high as 48 km/h. Independence Day: Partly sunny, with a high near 21. Light and variable wind becoming east 8 to 13 km/h in the morning. Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Cloudy, with a low around 8. East wind 6 to 11 km/h becoming light and variable after midnight. Chance of precipitation is 60%. Saturday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 16. Light south southwest wind becoming west 8 to 13 km/h in the morning. Chance of precipitation is 60%. Saturday Night: Partly cloudy, with a low around 7. Southwest wind 8 to 11 km/h. Sunday: Mostly sunny, with a high near 21. Southwest wind 8 to 16 km/h, with gusts as high as 34 km/h. Sunday Night: Partly cloudy, with a low around 8. West southwest wind 5 to 14 km/h, with gusts as high as 34 km/h. Monday: Mostly sunny, with a high near 23. Monday Night: Mostly clear, with a low around 10. Tuesday: Sunny, with a high near 27. Tuesday Night: Mostly clear, with a low around 13. Wednesday: Sunny, with a high near 29. | |
| St Mary MT 48.76°N 113.44°W (Elev. 4741 m) | |
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