Cloud 9 Surf Season
Siargao, Philippines · part of the Cloud 9 spot guide
Cloud 9 runs on two engines: west-Pacific typhoon groundswell (the marquee source, peaking August through November) and the northeast monsoon "Amihan" swell (November through March). There is a wind paradox — the Amihan northeast is onshore while the southwest Habagat is offshore — so prime is when typhoon swell and a southwest offshore coincide, from late August into November.
Where the swell comes from
West-Pacific typhoons fire east-to-northeast long-period groundswell in the late-summer and autumn season; the northeast monsoon adds swell in winter but blows onshore. The best days pair typhoon groundswell with a southwest offshore.
Historic swells at Cloud 9
Contest-season pumping windows
The Siargao International Surfing Cup has run since 1996 with contest windows tuned to typhoon swell — the reliable pattern of double-to-triple-overhead days through the autumn peak.
Super Typhoon Odette (Rai)
A Category-5 direct hit destroyed the viewing tower and caused widespread loss of life across the region — noted as a safety and exposure fact, not a surf event.