National City experiences a mild Mediterranean climate, with temperatures gradually warming up as the year progresses. Winters are cool and unpredictable, with temperatures fluctuating between freezing and mild days. Spring arrives in late March, bringing warmer temperatures that steadily rise throughout April and May, making it one of the warmest periods of the year. Summer months of June to August see average highs around 22-23°C, with July being the hottest month on record. Autumn brings a slight cooling trend, with October and November temperatures returning to averages similar to those in March and April.