Newport Beach's climate is mild, with temperatures gradually warming up in the spring. March and April bring cooler days, but May marks a significant increase in warmth, setting the stage for the hot summer months. June to August are the warmest periods, with temperatures often reaching the mid-30s, while July and August have similar averages. Autumn brings a welcome cool-down, with October being the mildest month of the season. Winter is relatively mild, but December can be quite chilly, with temperatures occasionally dipping into single digits.