Big Trinity Lake Weather Forecast
- 39
- 58
Mostly Sunny
- 24
- 50
Breezy
- 26
- 44
Partly Sunny
- 31
- 47
Mostly Cloudy
- 34
- 51
Chance Rain/Snow
- 22
- 50
Slight Chance Rain Showers
Today 20 Mar Boise Mountains
Sunny. Highs 66 to 81.
Tonight 20 Mar Boise Mountains
Partly cloudy. Lows 33 to 48.
Big Trinity Lake Temperature Statistics
March Temperature
Boise Air Terminal (40.4 miles)
Lowest 15 March, 2026
25.6 °FAverage March
46.9 °FHighest 18 March, 2026
79 °F
Climate (2021–Present)
Boise Air Terminal (40.4 miles)
Average Low 2021–2026
44.1 °FAverage 2021–2026
54.9 °FAverage High 2021–2026
66.1 °F