The best time to go to Schiedam is typically during the late spring (May to June) and early autumn (September).These months offer pleasant weather, with comfortable temperatures great for exploring the city's canals and historic windmills without the intense heat or larger crowds of mid-summer. You'll find the days are long enough for sightseeing, and outdoor dining is a real treat.For those who appreciate cultural events, May often sees various local festivals and open-air markets, while September brings harvest celebrations.