Summit Lake Weather Forecast
- 43
- 69
Mostly Sunny
- 49
- 75
Mostly Sunny
- 51
- 78
Mostly Sunny
- 53
- 78
Mostly Cloudy
- 51
- 76
Mostly Cloudy
- 49
- 73
Rain Showers
Today 15 Sep Humboldt County
Sunny. Highs 67 to 77. North Winds up to 10 Mph.
Tonight 15 Sep Humboldt County
Mostly clear. Lows 42 to 48. Northeast Winds up to 10 Mph.
Summit Lake Temperature Statistics
September Temperature
Alturas (77.1 miles)
Lowest 13 September, 2025
41 °FAverage September
66.5 °FHighest 1 September, 2025
91 °F
Climate (2020–Present)
Alturas (77.1 miles)
Average Low 2020–2025
32.9 °FAverage 2020–2025
49.2 °FAverage High 2020–2025
64.4 °F