Dollar to Japanese Yen forecast for December 2020. In the beginning rate at 104.08 Japanese Yens. High exchange rate 106.17, low 103.03. The average for the month 104.47. The USD to JPY forecast at the end of the month 104.60, change for December 0.5%. USD to JPY forecast for January 2021. In the beginning rate at 104.60 Japanese Yens.