Three Island Lake Weather Forecast
- 35
- 45
Becoming Sunny
- 36
- 47
Mostly Sunny
- 22
- 41
Chance Rain/Snow
- 27
- 38
Partly Sunny
- 31
- 41
Mostly Cloudy
- 31
- 46
Chance Rain/Snow
Today 19 Mar Boise Mountains
Sunny. Highs 60 to 75.
Tonight 19 Mar Boise Mountains
Mostly clear. Lows 35 to 50.
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