Winters in San Vicente de Baracaldo are cool and unpredictable, with temperatures fluctuating between freezing lows and mild highs. January is the coldest month, with average temperatures around 8°C, but it's not uncommon for temperatures to drop as low as -7°C. As spring approaches, temperatures gradually warm up, with March and April averaging around 11-12°C. Summers are warm to hot, with July and August often reaching highs of 37-38°C, while autumns bring a welcome return to milder temperatures, with October's average temperature still quite pleasant at 15°C.