The Arboretum Weather Forecast
- 54
- 78
Sunny
- 54
- 79
Sunny
- 53
- 77
Mostly Sunny
- 54
- 73
Sunny
- 56
- 81
Mostly Sunny
- 54
- 79
Mostly Sunny
- 53
- 75
Mostly Sunny
Today 11 Dec Los Angeles County San Gabriel Valley
Sunny. Highs in the mid 70s to around 80.
Tonight 11 Dec Los Angeles County San Gabriel Valley
Clear. Lows in the lower to mid 50s.
The Arboretum Temperature Statistics
December Temperature
El Monte (4.3 miles)
Lowest 6 December, 2025
46.4 °FAverage December
68 °FHighest 9 December, 2025
84.2 °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