Raw sugar futures fell, toppling from a four-week high touched the previous day as an improving weather outlook in top producer Brazil reinforced expectation of ample supplies and as technical resistance and a weak real weighed. July raw sugar on ICE Futures U.S. fell 0.64 cent, or 3.88%, to settle at 15.87 cents per lb, near the session low of 15.78 cents. August white sugar closed down $13.60, or 2.91%, at $453.30 per tonne.