Harbour Island Bahamas weather is truly magnificent all year round. With the exception of an occasional rain shower in the late afternoon, it’s sunny 340 days out of the year. In winter and spring there is hardly any rainfall at all in Harbour Island and the Bahamas. The temperature in Dunmore Town averages 74° in the winter, 78° in the spring and fall, and 83° in the summer. With only a 20° difference in temperature from summer to winter there’s no off-season which means it’s never too hot or too cold to visit Harbour Island.
Officially the hurricane season is from June through November but don’t let that impact your travel dates. Hurricanes are very rare in the Out Islands and are much more likely to pass to the west and head towards the US.