Weather in Milan Milan has a humid continental climate with very distinct seasons as a result of its location in Po Valley. The coldest period on the calendar is between December and February when temperatures can fall below freezing. The winter season is characterised by rain, showers, fog and even snow. Summer starts around May and lasts until September. August is normally the hottest month with temperatures reaching around 30C. Many Milanese escape to the coast, parks and lakes during this period of intense heat which is prone to storms. Summers in Milan are normally very hot and muggy. The wettest months of the year are between September and October. Milan Travel Guide Leave a Reply Cancel ReplyYour email address will not be published.CommentName* Email* Website Save my name, email, and website in this browser for the next time I comment.