Oeiras, Portugal experiences a mild Mediterranean climate with distinct seasonal patterns. Winters are cool and occasionally chilly, with temperatures ranging from around freezing to the mid-teens Celsius, averaging around 10-13°C. As spring approaches, temperatures gradually warm up, reaching highs in the mid-twenties by April and May, but still experiencing cooler mornings. Summers are warm to hot, with temperatures frequently soaring above 30°C, especially in July and August, while autumn brings a welcome respite from the heat, with temperatures dropping back down into double digits by October.