Alta Hill Reservoir Weather Forecast
- 60
- 86
Chance Rain Showers
- 58
- 70
Chance Rain Showers
- 58
- 79
Mostly Sunny
- 61
- 81
Sunny
- 63
- 87
Mostly Sunny
- 59
- 81
Slight Chance Thunderstorms
Today 18 Sep Motherlode
Mostly cloudy. Highs 81 to 91. Light Winds becoming south up to 10 Mph in the afternoon.
Tonight 18 Sep Motherlode
Cloudy with a chance of rain Showers. Lows 58 to 66. Light Winds.
Alta Hill Reservoir Temperature Statistics
September Temperature
Nevada County Air Park (3.1 miles)
Lowest 10 September, 2025
55.4 °FAverage September
71.6 °FHighest 2 September, 2025
95 °F
Climate (2020–Present)
Nevada County Air Park (3.1 miles)
Average Low 2020–2025
52 °FAverage 2020–2025
60.4 °FAverage High 2020–2025
68.8 °F