Big Trinity Lake Weather Forecast
- 23
- 43
Mostly Sunny
- 26
- 48
Mostly Sunny
- 30
- 52
Sunny
- 32
- 55
Sunny
- 33
- 54
Mostly Sunny
- 33
- 54
Mostly Sunny
Today 13 Oct Boise Mountains
Decreasing Clouds. Snow Showers likely. Rain Showers Likely, mainly in the afternoon. Areas of fog in the morning. Patchy fog in the afternoon. Chance of precipitation 60 percent. Little snow accumulation Expected. Cooler with Highs 44 to 57.
Tonight 13 Oct Boise Mountains
Mostly clear. Widespread frost after midnight. Lows 21 to 36.
Big Trinity Lake Temperature Statistics
October Temperature
Boise Air Terminal (40.4 miles)
Lowest 11 October, 2026
43 °FAverage October
66.3 °FHighest 4 October, 2026
88.6 °F
Climate (2021–2026)
Boise Air Terminal (40.4 miles)
Average Low 2021–2026
44.2 °FAverage 2021–2026
55 °FAverage High 2021–2026
66.4 °F