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Bismark Reservoir Weather Forecast
Bismark Reservoir, MT Weather Forecast Date: 337 PM MDT Sat Aug 15 2026
Weather forecast for Bismark Reservoir, MT
Tonight Lo: 45°F Lo: 7°C |
Tonight... Mostly cloudy in the evening then becoming partly cloudy. Chance of thunderstorms early in the evening, then slight chance of thunderstorms late in the evening. Slight chance of rain showers after midnight. Patchy fog late in the night. Lows 40 to 48. Southwest winds up to 10 mph. Chance of precipitation 50%. |
Sun Hi: 69°FHi: 21°C Lo: 47°F Lo: 8°C |
Sunday... Partly sunny. Chance of rain showers and slight chance of thunderstorms in the afternoon. Highs 63 to 73. Southwest winds up to 10 mph. Chance of precipitation 40%. |
| Mon Hi: 70°FHi: 21°C Lo: 49°F Lo: 9°C |
Monday... Partly sunny. A 20% chance of thunderstorms in the afternoon. Highs 64 to 74. South winds up to 10 mph shifting to the southwest in the afternoon. Gusts up to 25 mph. |
| Tue Hi: 67°FHi: 19°C Lo: 46°F Lo: 8°C |
Tuesday... Partly sunny. Chance of rain showers and slight chance of thunderstorms in the morning, then chance of thunderstorms in the afternoon. Highs 61 to 71. Chance of precipitation 50%. |
Wed Hi: 69°FHi: 21°C Lo: 48°F Lo: 9°C |
Wednesday... Mostly sunny. Highs 63 to 73. |
| Thu Hi: 72°FHi: 22°C Lo: 51°F Lo: 11°C |
Thursday... Sunny. Highs 66 to 76. |
| Fri Hi: 76°FHi: 24°C Lo: 53°F Lo: 12°C |
Friday... Mostly sunny. A 20% chance of thunderstorms in the afternoon. Highs 70 to 80. |
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