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Grass Range, MT Weather Forecast
Grass Range, MT Weather Forecast Date: 336 PM MDT Wed Sep 09 2026
The area/counties/county of: Fergus County Below 4500ft, including the cities of: Hilger and Lewistown.or toggle through each period.
Tonight... Mostly clear. Lows in the lower 50s. Southwest winds 5 to 15 mph with gusts to around 30 mph.
Thursday... Breezy, sunny. Highs in the mid 80s. West winds 10 to 15 mph increasing to 15 to 25 mph in the afternoon.
Thursday Night... Mostly cloudy. Rain showers likely after midnight. Lows around 50. Northwest winds 5 to 15 mph. Gusts up to 30 mph in the evening. Chance of showers 70%.
Friday... Much cooler. Cloudy with rain showers in the morning, then partly sunny with chance of rain showers in the afternoon. Highs in the lower 60s. North winds 5 to 15 mph. Chance of showers 80%.
Friday Night... Mostly cloudy with a 20% chance of rain showers. Lows in the lower 40s. North winds 5 to 15 mph shifting to the northwest up to 5 mph after midnight.
Saturday... Mostly cloudy. A 20% chance of rain showers in the morning. Highs in the upper 50s.
Saturday Night... Mostly cloudy. Chance of rain showers and slight chance of thunderstorms in the evening, then chance of rain showers after midnight. Lows in the lower 40s. Chance of precipitation 50%.
Sunday... Rain showers likely in the morning, then rain showers and slight chance of thunderstorms in the afternoon. Highs in the lower 50s. Chance of precipitation 80%.
Sunday Night... Mostly cloudy. Rain showers in the evening, then chance of rain showers after midnight. Lows in the upper 30s. Chance of showers 80%.
Monday... Partly sunny with a 20% chance of rain showers in the morning, then sunny in the afternoon. Highs in the lower 60s.
Monday Night... Mostly clear. Lows around 40.
Tuesday... Mostly sunny. Highs in the mid 60s.
Tuesday Night... Partly cloudy in the evening, then mostly cloudy with a 20% chance of rain showers after midnight. Lows in the lower 40s.
POP = Probability of Precipitation
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