| NWS Forecast for: Petroleum County Issued by: National Weather Service Glasgow, MT Last Update: 1235 AM MDT Mon Jun 15 2026 |  |
| Rest Of Tonight: Mostly clear. Lows in the upper 40s. West wind 5 to 10 mph. Monday: Mostly sunny. Highs in the upper 70s. Northwest wind 10 to 15 mph. Monday Night: Mostly cloudy. Lows in the lower 50s. Northwest wind 10 to 15 mph, becoming southwest around 5 mph after midnight. Tuesday: Mostly cloudy in the morning, then becoming mostly sunny. Breezy with highs in the upper 80s. West wind 10 to 15 mph, increasing to 20 to 25 mph with gusts up to 40 mph in the afternoon. Tuesday Night: A slight chance of thunderstorms in the evening, then a chance of showers after midnight. Windy with lows in the lower 50s. Northwest wind 20 to 30 mph with gusts up to 40 mph. Chance of rain 30 percent. Wednesday: A slight chance of showers. Windy, cooler with highs around 70. Wednesday Night Through Juneteenth: Partly cloudy. Breezy. Lows in the mid 40s. Highs in the mid 70s. Friday Night And Saturday: Partly cloudy. Lows around 50. Highs in the upper 70s. Saturday Night: A slight chance of thunderstorms. Lows around 50. Sunday: A chance of showers with a slight chance of thunderstorms. Highs in the lower 70s. | |
| Zone Forecast: Petroleum County | |
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