If you're hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Manokwari: The hottest months are usually October and May with an average temp of 80°F, while the coldest months are August and July with an average of 79°F. The rainiest months in Manokwari are April, March, January, and December, with each month seeing an average of 15 inches of rainfall.