San Marino Weather Forecast
- 51
- 71
Mostly Cloudy
- 52
- 72
Mostly Cloudy
- 55
- 66
Rain Showers
- 54
- 63
Rain Showers
- 52
- 64
Rain Showers
- 48
- 62
Rain Showers Likely
Today 21 Dec Los Angeles County San Gabriel Valley
Mostly cloudy in the morning then partly cloudy. Highs around 70.
Tonight 21 Dec Los Angeles County San Gabriel Valley
Partly cloudy in the evening then low Clouds and fog. Lows in the upper 40s to mid 50s.
San Marino Temperature Statistics
December Temperature
El Monte (5 miles)
Lowest 6 December, 2025
46.4 °FAverage December
67.8 °FHighest 9 December, 2025
84.2 °F
Climate (2020–Present)
El Monte (5 miles)
Average Low 2020–2025
59.4 °FAverage 2020–2025
70.2 °FAverage High 2020–2025
76.9 °F