Alofi features a tropical rainforest climate under the Köppen climate classification, with no discernible dry season. The city has a noticeably drier stretch from June through September. However, all of these months average more than  of rain, the limit for a dry season month. Average temperatures vary slightly throughout the course of the year in Alofi hovering at around , during the warmest month (February) and at around  during the coolest months (July and August) .