Santa Clara Weather in September

The climate in Santa Clara during September can be summarized as warm and reasonably dry.

September is in the fall / autumn in Santa Clara and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a comfortable 27°C (81°F), whilst at night 13°C (55°F) is normal.

On average September is the 3rd wettest month of the year in Santa Clara with around 76mm 3 inches of rain making it a reasonably dry 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 6.7 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 Santa Clara in September 2025.