US bond yields fall ahead of inflation data amid anticipation of the Fed's decision.

US Treasury yields fell during trading on Wednesday, as investors remained cautious ahead of the release of September's inflation data, which could provide new clues about the direction of monetary policy and the path of interest rates in the coming period.

The yield on two-year Treasury bonds fell by about 2.1 basis points to 4.772%, while the yield on 10-year bonds declined by about 2.3 basis points to 5.194%. The yield on 30-year bonds also dropped by about 1.7 basis points to 5.546%.

Markets are focused on the US Consumer Price Index data due later on Wednesday, amid expectations that the annual inflation rate will accelerate to 3.6% in September, compared to 3.4% in August.

According to Reuters, the Consumer Price Index is expected to rise by 0.6% month-on-month in September, compared to a 0.4% increase in the previous month, with higher energy and gasoline prices contributing to pushing the headline reading upward.

In contrast, investors are awaiting the core inflation reading, which excludes the more volatile food and energy prices, for clearer indications of continued price pressures within the US economy and the extent to which the Federal Reserve needs further monetary tightening.

Deutsche Bank analysts pointed out that inflation data is gaining added importance this time, given that it is being released only about two weeks before the Federal Reserve meeting, making any upward or downward surprise in the figures capable of changing investors' expectations regarding the central bank's decision.

The CME Fidwatch tool shows that markets are pricing in a roughly 78% probability of interest rates being held steady at this month's Federal Reserve meeting, while the possibility of further monetary policy tightening remains at subsequent meetings if price data show inflation continuing at high levels.

Bond yields remain highly sensitive to interest rate expectations, as a higher-than-expected inflation reading could lead to renewed selling pressure on bonds and a rise in yields, with increased bets on the continuation of tight monetary policy for a longer period.

If inflation data comes in lower than market expectations, yields may continue to decline, amid growing expectations that the Federal Reserve will prefer to keep interest rates unchanged at its next meeting, until a clearer picture emerges regarding the direction of prices and economic activity.