| NWS Forecast for: Fallon County Issued by: National Weather Service Billings, MT Last Update: 244 AM MDT Mon Sep 21 2026 |  |
| Today: Mostly cloudy. Patchy fog early in the morning. Highs in the mid 60s. Southeast winds 10 to 20 mph. Tonight: Mostly cloudy. Lows in the lower 40s. Southeast winds 10 to 20 mph. Tuesday: Decreasing clouds. Highs in the lower 70s. Southeast winds 15 to 25 mph. Tuesday Night: Mostly cloudy. Chance of rain showers overnight. Chance of rain showers and slight chance of thunderstorms after 3 am. Lows in the upper 40s. Southeast winds 15 to 25 mph. Chance of precipitation 40 percent. Wednesday: Rain showers likely and chance of thunderstorms in the morning, then chance of rain showers and slight chance of thunderstorms in the afternoon. Highs in the upper 70s. Southwest winds 5 to 15 mph. Chance of precipitation 60 percent. Wednesday Night: Mostly clear. Lows in the upper 40s. Thursday: Sunny. Highs in the lower 80s. Thursday Night: Partly cloudy. Lows in the lower 50s. Friday: Mostly sunny. Highs in the lower 80s. Friday Night: Partly cloudy. Lows in the lower 50s. Saturday: Sunny. Highs in the mid 70s. Saturday Night: Partly cloudy. A 20 percent chance of rain showers overnight. Lows in the mid 40s. Sunday: Mostly sunny. A 20 percent chance of rain showers in the afternoon. Highs in the lower 70s. | |
| Zone Forecast: Fallon County | |
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