Walnut Creek in September

Average high

27.8°C

Average low

14°C

Rainfall

—

— wet days

Comfort score

out of 100

September in Walnut Creek averages a daily high of 27.8°C with nights around 14°C. Comfortable conditions for being outdoors all day.

Across the year, the best time to visit Walnut Creek is April–October.

Based on BRIONES CALIFORNIA, CA US (6.3km), 1995–2024. 29 years of September data.