Fullerton Weather in August

The climate in Fullerton during August can be summarized as warm and a little damp.

August is in the summer in Fullerton and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a comfortable 30°C (85°F), whilst at night 16°C (60°F) is normal.

On average August is the 4th wettest month of the year in Fullerton with around 84mm 3.3 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.

On the flip side this corresponds to an average of 10.8 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 Fullerton in August 2025.