The Federal Reserve Bank of New York is boosting the amount of temporary liquidity it is willing to make available to financial markets starting this week, the bank said on Wednesday.

It said that as of Thursday, the minimum size of its overnight repurchase-agreement, or repo, operations will rise to $120 billion, from what had been at least $75 billion. Longer-term operations will rise from a minimum daily offering size of $35 billion and go up to $45 billion in interventions scheduled for Thursday and Oct. 29. The longer-term...