Santarem's winters are chilly, with temperatures rarely rising above 10°C in January and February. As spring arrives, temperatures gradually warm up, reaching averages of 16°C by April and 17°C by May. Summer brings the warmest months, with July and August averaging around 21°C, but temperatures can soar to as high as 38°C on occasion. Autumn is mild, with temperatures dipping back down to averages of 14°C by November and December. Overall, Santarem's climate is mild, with moderate temperature fluctuations throughout the year.