| NWS Forecast for: Petroleum County Issued by: National Weather Service Glasgow, MT Last Update: 326 PM MDT Sun Sep 27 2026 | |
| Tonight: Mostly cloudy. Lows in the lower 40s. Southeast wind 5 to 10 mph, becoming west after midnight. Monday: Mostly cloudy in the morning, then becoming mostly sunny. Highs around 70. Northwest wind around 5 mph, becoming north around 5 mph in the afternoon. Monday Night: Mostly clear. Lows in the mid 40s. South wind around 5 mph, becoming southwest after midnight. Tuesday: Sunny. Highs in the upper 70s. West wind 5 to 10 mph. Tuesday Night: Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 50s. West wind around 5 mph. Wednesday Through Thursday: Partly cloudy. Highs in the upper 60s. Lows in the lower 40s. Thursday Night: Mostly clear. Lows in the lower 40s. Friday: Mostly sunny. Highs in the lower 70s. Friday Night: Mostly cloudy. Lows in the mid 40s. Saturday Through Sunday: Partly cloudy. Highs in the mid 60s. Lows in the lower 40s. | |
| Zone Forecast: Petroleum County | |
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