| NWS Forecast for: Southwestern Yellowstone Issued by: National Weather Service Billings, MT Last Update: 1252 AM MDT Tue Aug 18 2026 | |
| Today: Mostly cloudy early in the morning then becoming sunny in the late morning and early afternoon then becoming partly sunny late in the afternoon. Chance of showers and slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Southwest winds 5 to 10 mph. Chance of precipitation 50 percent. Tonight: Decreasing clouds. Chance of showers and slight chance of thunderstorms early in the evening, then slight chance of showers late in the evening. Lows in the upper 50s. Southwest winds 5 to 15 mph. Chance of precipitation 50 percent. Wednesday: Sunny. Highs in the upper 80s. West winds 5 to 15 mph. Wednesday Night: Mostly clear. Lows in the upper 50s. North winds 5 to 10 mph in the evening shifting to the southwest overnight. Thursday: Sunny. Highs in the lower 90s. West winds 5 to 10 mph. Thursday Night: Mostly clear. Lows in the lower 60s. Friday: Mostly sunny. Highs around 90. Friday Night: Partly cloudy. Lows in the mid 60s. Saturday: Decreasing clouds. A 20 percent chance of showers. Highs in the lower 90s. Saturday Night: Mostly cloudy. Chance of showers and slight chance of thunderstorms in the evening. Lows in the lower 60s. Chance of precipitation 30 percent. Sunday: Mostly sunny. Highs in the upper 80s. Sunday Night: Partly cloudy. A 20 percent chance of showers in the evening. Lows in the lower 60s. Monday: Mostly sunny. Highs in the upper 80s. | |
| Zone Forecast: Southwestern Yellowstone | |
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