Three Island Lake Weather Forecast
- 35
- 45
Mostly Sunny
- 35
- 49
Mostly Sunny
- 22
- 41
Partly Sunny
- 27
- 38
Partly Sunny
- 31
- 41
Mostly Cloudy
- 31
- 46
Chance Rain/Snow
Today 19 Mar Boise Mountains
Clear. Highs 62 to 77.
Tonight 19 Mar Boise Mountains
Mostly clear. Lows 33 to 48.
Three Island Lake Temperature Statistics
March Temperature
Stanley, Stanley Ranger Station (18.6 miles)
Lowest 15 March, 2026
7 °FAverage March
30.8 °FHighest 8 March, 2026
48.9 °F
Climate (2021–Present)
Stanley, Stanley Ranger Station (18.6 miles)
Average Low 2021–2026
23.2 °FAverage 2021–2026
38.5 °FAverage High 2021–2026
53.9 °F