April in Biên Hòa is the hottest month of the year. In April, the weather in Biên Hòa is typically hot. Average daily high temperature in April is about 34 degrees above zero. On average, Biên Hòa has 14 rainy, 10 partly cloudy, and 6 sunny days in April. The rains are usually heavy. April as well as May, June, July, and August is considered the most uncomfortable time to visit Biên Hòa.