The Arboretum Weather Forecast
- 48
- 71
Sunny
- 49
- 75
Sunny
- 54
- 79
Sunny
- 56
- 82
Mostly Sunny
- 55
- 81
Mostly Sunny
- 55
- 81
Sunny
Today 6 Dec Los Angeles County San Gabriel Valley
Sunny. Highs around 70.
Tonight 6 Dec Los Angeles County San Gabriel Valley
Clear. Lows in the mid 40s to around 50.
The Arboretum Temperature Statistics
December Temperature
El Monte (4.3 miles)
Lowest 2 December, 2025
48.2 °FAverage December
65.1 °FHighest 1 December, 2025
73.4 °F
Climate (2020–Present)
El Monte (4.3 miles)
Average Low 2020–2025
59.4 °FAverage 2020–2025
70.2 °FAverage High 2020–2025
76.9 °F