In terms of precipitation, rainfall in Biak ranges from 7.1 - 9.8 inches per month. January is typically the wettest month, when rainfall can reach 9.8 in. October is typically the driest time to visit Biak when rainfall is around 7.1 in.
If weather is an important factor for your trip to Biak, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 80.6 F).