| Jan | Northeast monsoon brings scattered rain and occasional choppy seas. Visibility drops to 10-15 m but marine life remains abundant — turtles and reef sharks are residents year-round. Fewer divers means more solitude. |
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| Feb | Transitional month with improving conditions. Visibility begins clearing (10-20 m) and seas calm. Good value for budget-conscious divers — package prices are lowest before peak season begins. |
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| Mar | Peak season begins. Visibility jumps to 20-30 m with calm, glassy seas. The famous barracuda tornadoes at Barracuda Point are at their most spectacular. Book 6-12 months ahead — permits sell out fast. |
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| Apr | Absolute peak month. Visibility reaches 25-40 m with glass-calm conditions. Massive barracuda schools plus herds of bumphead parrotfish. Water warms to 29°C. Turtle nesting season begins on the island's beaches. |
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| May | Peak continues with the warmest water (30°C) and excellent visibility (25-40 m). Pelagic action at its best — hammerheads still possible at South Point, barracuda schools huge, turtles everywhere. The most popular month for international divers. |
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| Jun | Peak season finale with warm water (30°C), good visibility (20-30 m), and full pelagic action. Turtles nesting on the island's beaches. Still busy — permits require advance booking. |
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| Jul | Busy summer month with warm water (30°C) and moderate visibility (15-25 m). Bumphead parrotfish at their seasonal peak. European summer holidays bring crowds — permits especially tight. Turtle nesting continues. |
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| Aug | Still warm (30°C) with good diving conditions (15-25 m vis). Occasional southerly winds may create surface chop. Fewer tourists than July. Good turtle sightings persist. A solid alternative to peak months. |
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| Sep | Secondary shoulder season with fewer crowds and good conditions (15-25 m vis, 29°C). Fewer boats on the water means more intimate dive experiences. An excellent month for divers who prefer solitude over peak visibility. |
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| Oct | Secondary peak month. Visibility improves again (15-25 m) and hammerhead sharks become more frequent at South Point. Fewer tourists than March-June but still excellent diving. Good value packages available. |
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| Nov | ⚠️ FULL CLOSURE November 2026 — the first-ever complete month closure of Sipadan for conservation. No diving, no tourism. Plan around this if visiting in 2026. In non-closure years, November offers good diving with fewer crowds. |
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| Dec | Rainy season returns with lower visibility (10-20 m) and occasional choppy seas. Quieter — the fewest divers of any open month. Package prices at their lowest. Marine life still abundant; turtles and reef sharks are permanent residents. |
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