Diamond Bar Weather in January

The climate in Diamond Bar during January can be summarized as mild and a little damp.

January is in the winter in Diamond Bar and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a cool 19°C (65°F), whilst at night 4°C (40°F) is normal.

On average January is the 2nd wettest month of the year in Diamond Bar with around 90mm 3.5 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 5 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.7 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Diamond Bar in January 2024.