Winters in Irun, Spain are cool and temperamental, with temperatures fluctuating between freezing lows and mild highs. January is the coldest month, with averages ranging from 6°C, while February sees a slight warming trend. As spring approaches, March and April temperatures gradually rise, often reaching highs of 28°C, but still experiencing chilly nights. Summer months bring warmth, with June to September averaging around 20-22°C highs, though occasional heatwaves can push temperatures above 40°C. Autumn returns mild temperatures, with October and November averages dipping back into single digits.