Grass Valley Reservoir Weather Forecast
- 38
- 67
Becoming Sunny
- 33
- 53
Mostly Sunny
- 37
- 59
Mostly Sunny
- 38
- 60
Partly Sunny
- 37
- 59
Chance Rain/Snow
- 35
- 53
Chance Rain/Snow
Today 21 Apr Southern Mountains
Partly cloudy in the morning then clearing. Breezy. Highs in the upper 50s. South Winds 15 to 25 Mph late morning through afternoon.
Tonight 21 Apr Southern Mountains
Windy. Mostly clear. Lows in the lower 30s. Southwest Winds 20 to 30 Mph.
Grass Valley Reservoir Temperature Statistics
April Temperature
St George Municipal Airport (25.5 miles)
Lowest 18 April, 2026
41 °FAverage April
64.5 °FHighest 8 April, 2026
87.1 °F
Climate (2021–Present)
St George Municipal Airport (25.5 miles)
Average Low 2021–2026
52.9 °FAverage 2021–2026
64.8 °FAverage High 2021–2026
76.9 °F