If you're hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Beiliu: The hottest months are usually July and August with an average temp of 81°F, while the coldest months are January and December with an average of 61°F. The rainiest months in Beiliu are May, June, August, and July, with each month seeing an average of 11 inches of rainfall.