January in Monterey Park averages a daily high of 21.4°C with nights around 7.2°C. Expect roughly 6.3 wet days totalling 99.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Monterey Park is March–June.
Based on SAN GABRIEL FIRE DEPARTMENT, CA US (3.2km), 1995–2024. 18 years of January data.