Brent crude futures for September settlement fell 67 cents, or 0.7 percent, to $102.53 a barrel, down for a fourth day.
US West Texas Intermediate crude futures for September delivery also fell 77 cents, or 0.8 percent, to $93.93 a barrel, also down for a fourth day.
This decline came today, Monday, as the contracts continue the recent series of losses, amid fears that the expected rise in US interest rates, may weaken demand for fuel.
Oil futures have been volatile in recent weeks, as traders have tried to juggle the prospects of raising interest rates, which could limit economic activity.
Thus, this reduces the growth of demand for the fuel, in exchange for the lack of supplies from the disruptions in the circulation of Russian barrels due to Western sanctions.