The dollar has stood strongly against the franc in recent sessions, driven by robust US data and ahead of the Fed's meeting.
The Fed raised its key rate to 4 percent on Tuesday, and expectations have grown that the European Central Bank, which holds a policy meeting on Thursday, could raise rates from 2 percent by the end of the year.
The Fed reiterated that monetary policy accommodation would likely be removed at a measured pace, indicating more hikes were in the pipeline.
The franc has witnessed a slew of strong Swiss economic data - boosting interest rate expectations - tarnished only slightly by Tuesday's purchasing managers' index, which eased in October to a seasonally adjusted 56.8 points from 57.5 points in September.
The dollar last traded at 1.2854/56 Swiss francs, down slightly from 1.2892/95 in late trading in Europe on Tuesday. The euro stood at 1.5469/75 francs, virtually unchanged from 1.5475/80 francs on Tuesday.