The weighted average of the Fed funds rate has edged higher. Following the Fed hike in December 2015, the Fed funds average around 36 bp in January before moving into a 37-38 bp range. However, since the UK referendum it has been trading consistently around 40 bp.
The Fed fund futures contract settles at the average effective Fed funds rate for a given month, not at the policy rate. Ahead of next week's FOMC meeting where practically no one expects a change in policy, implied yield of the July Fed funds futures contract is 40.25 bp.