Sumba Surf Season, Surfing Conditions Sumba- Waterways Travel
Weather and seasons along the entire Indonesian archipelago are effected by its location between two landmasses: the hot, dry deserts of Australia to the south, and the green, lush Asian continent to the north.
High season for both surf and weather in Sumba is March through October, when the southeast monsoon blows hot, dry air up from the deserts of North Australia. The winds during this time are from the southeast, which favor some spots in Sumba, and create crosswinds at others. Unlike Bali, the trades don’t blow all day, every day and there are periods of consistent winds, followed by periods of no wind. Sumba is also a large island that creates it own off shore land breeze in the morning. Morning off-shores give way to Southeast trade winds late each morning. June through August will experience the strongest trades, with March through May and September/October often glassy all day.
Although Sumba does not receive nearly as much rainfall as the islands to the north, November to March is the rainy season; but don’t let the possibility of rain deter you from traveling during November or February/March as these can be good months with smaller clean swell and glassy conditions.
Seasonal air temperatures range from 78 – 95° with the hottest months being November through February. The water temperature is just about perfect year round at 77 – 82°, with the coolest months being June and July.