| NWS Forecast for: Big Belt, Bridger and Castle Mountains Issued by: National Weather Service Great Falls, MT Last Update: 336 PM MDT Wed Aug 19 2026 | |
| Tonight: Partly cloudy. Lows in the mid 50s. Northwest winds up to 10 mph with gusts to around 30 mph shifting to the southwest after midnight. Thursday: Warmer, sunny. Highs 76 to 86. Southwest winds up to 10 mph. Gusts up to 20 mph increasing to 30 mph in the afternoon. Thursday Night: Partly cloudy. Lows in the upper 50s. Northeast winds up to 10 mph. Gusts up to 30 mph in the evening. Friday: Sunny. Highs 77 to 87. Northwest winds up to 10 mph. Gusts up to 25 mph in the afternoon. Friday Night: Partly cloudy in the evening then becoming mostly cloudy. Lows in the upper 50s. East winds 5 to 15 mph with gusts to around 30 mph. Saturday And Saturday Night: Mostly cloudy with chance of rain showers and slight chance of thunderstorms. Highs 74 to 82. Lows in the mid 50s. Chance of precipitation 50 percent. Sunday: Mostly sunny. A 20 percent chance of thunderstorms in the afternoon. Highs 72 to 80. Sunday Night: Partly cloudy. Lows in the lower 50s. Monday: Sunny. Highs 69 to 79. Monday Night And Tuesday: Partly cloudy. A 20 percent chance of thunderstorms. Lows in the lower 50s. Highs 71 to 81. Tuesday Night: Mostly cloudy. A 20 percent chance of thunderstorms in the evening. Lows in the mid 50s. Wednesday: Mostly sunny. A 20 percent chance of thunderstorms in the afternoon. Highs 71 to 81. | |
| Zone Forecast: Big Belt, Bridger and Castle Mountains | |
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