Big Trinity Lake Weather Forecast
- 37
- 59
Sunny
- 42
- 65
Sunny
- 48
- 71
Sunny
- 49
- 77
Mostly Sunny
- 46
- 74
Mostly Sunny
- 44
- 68
Sunny
- 47
- 70
Sunny
Today 5 Jul Boise Mountains
Sunny. Highs 67 to 81.
Tonight 5 Jul Boise Mountains
Clear. Lows 39 to 54.
Big Trinity Lake Temperature Statistics
July Temperature
Boise Air Terminal (40.4 miles)
Lowest 3 July, 2025
66 °FAverage July
82.4 °FHighest 1 July, 2025
102 °F
Climate (2020–Present)
Boise Air Terminal (40.4 miles)
Average Low 2020–2025
43.7 °FAverage 2020–2025
54.4 °FAverage High 2020–2025
65.7 °F