S�dert�lje, and the rest of Stockholm region has a humid continental climate according to the K�ppen climate classification and displays four distinct seasons. Due to the city's high northerly latitude, daylight varies widely from more than 18 hours around midsummer, to only around 6 hours in midwinter. S�dert�lje has much warmer and sunnier weather than other locations at the same latitude mainly because of the influence of Gulf Stream. The city enjoys 1,981 hours of sunshine annually.
Summers have an average daytime high temperatures of 20�23 �C (68�73 �F) and lows of around 15 �C (59 �F), but there are periods of heat waves and many days with temperatures above 25 �C (77 �F)+). Winters are cold, though sometimes milder with temperatures ranging from -3 to 1 �C (27 to 34 �F), while spring and autumn mainly cool.
Annual precipitation is 539 mm (21.2 in) with light to moderate rainfall throughout the year. Snow mainly occurs from December through March, but snow covers does not remain for a long time
