Ruby River Reservoir Weather Forecast
- 33
- 59
Rain
- 30
- 54
Chance Rain/Snow
- 38
- 64
Partly Sunny
- 44
- 72
Partly Sunny
- 45
- 75
Slight Chance Thunderstorms
- 45
- 76
Slight Chance Thunderstorms
- 41
- 70
Chance Rain
Today 20 May Beaverhead and Western Madison below 6000ft
Mostly cloudy. A 20 percent chance of Thunderstorms late in the afternoon. Highs 56 to 62. West Winds 5 to 15 Mph.
Tonight 20 May Beaverhead and Western Madison below 6000ft
Rain Showers likely and slight chance of Thunderstorms early in the Evening, then rain late in the evening. Rain and snow likely after midnight. Snow accumulation up to 1 inch. Lows in the mid 30s. North Winds 5 to 15 Mph with Gusts to around 35 Mph. Chance of precipitation near 100 percent.
Ruby River Reservoir Temperature Statistics
May Temperature
Dillon, Dillon Airport (20.5 miles)
Lowest 6 May, 2026
23.6 °FAverage May
52.5 °FHighest 12 May, 2026
85.6 °F
Climate (2021–Present)
Dillon, Dillon Airport (20.5 miles)
Average Low 2021–2026
31.5 °FAverage 2021–2026
43.9 °FAverage High 2021–2026
57 °F