San Leandro experiences mild winters, with temperatures rarely dropping below freezing and averaging around 11°C in January. Spring brings gradual warming, with April being the warmest month so far, averaging 13°C. Summer months are warm to hot, with July and August often reaching highs above 40°C, but also experiencing cooler nights. Autumn is characterized by a return to milder temperatures, with October and November seeing averages around 16°C before dropping again in December, which has the lowest average temperature of the year at around 9°C.