"My view is that those numbers are in the ballpark," Fischer, the Fed's second in command, said in an interview with broadcaster CNBC.

The Fed raised interest rates last month for the first time in nearly a decade.

His view is in step with the median of Fed officials' latest forecasts, which is for four rate hikes this year.

However, Fischer said that uncertainty had risen due to economic news out of China and geopolitical events such as North Korea saying it has tested a miniaturized hydrogen bomb.

"We have to react to incoming events and we will react to them," Fischer added. "We don't know enough now to know how many [rate hikes in 2016] there will be."

(Reporting by Lindsay Dunsmuir and Jason Lange; Editing by Meredith Mazzilli)