Nothing is worse than getting a bowl of soup and it is not at the proper temperature. Luke-warm soups are a disappointment and cold soups that are too warm are the not as refreshing as they should be. Ideally, serve soups at these temperatures:

Hot Clear Soups: serve near boiling 210°F (99°C)
Hot Cream or Thick Soups: serve between 190°F to 200°F (88°C to 93°C)
Cold Soups: serve at 40°F (4°C) or lower

When serving hot soups, always make sure to serve the soup in warmed bowls so the soup stays hot on its way to the table; likewise, cold soups should be served in chilled bowls.