Nalvo seasonal overview
Best Surf Season (November - January)
The northeast monsoon, known locally as Amihan, takes the wheel during late autumn and early winter. Strong high pressure over the Asian continent funnels a consistent stream of E to NE winds across the Philippines, and for Nalvo's west-facing sand this means the highest percentage of clean, offshore-to-cross-offshore conditions of the year. Average surf during this window runs 3.5-4ft (1.0-1.2m) with periods in the 7.7-8.0s range, producing punchy, rideable surf rather than unruly slop. December is the standout month, with ideal wind conditions 59 percent of the time and plenty of N, NNE and NW windswell filling the water. When the angle turns into WNW/NW, this is Nalvo at its best: lined-up, offshore and fun-sized.
Fair Surf Season (February - March and September - October)
These shoulder months sit on the fence between the two monsoons. February and March still see plenty of Amihan influence, although the swell drops to 2.5-3ft (0.7-0.9m) and periods shorten as the high-pressure system weakens. September and October are the more interesting fair months: summer's southwest monsoon is still generating W/SW swell, but the wind regime is slowly switching back to offshore easterlies, and the average ideal wind score climbs to 28-44 percent. Typhoon activity in the West Pacific can also throw long-period W/NW swell at the west-facing coast, so keep an eye on the tropical forecasts during this window.
Low Surf Season (April - August)
Between April and August, Nalvo feels the full force of the southwest monsoon, or Habagat. The wind clocks around to S/SSW/SW, which is exactly the wrong side of the compass for a west-facing spot, blowing bumps and chop into the bay. April and May are the worst months for surf size anyway, with averages bottoming out at around 1.5-2ft (0.5m) and period below 6s. June through August do produce the most consistent WSW/SW swell of the year, and heights can push into the 5-6.5ft (1.5-2m) range, but the accompanying onshore winds keep quality low. For a clean wave, you want a passing tropical cyclone or an unusual easterly breeze; otherwise it is mostly a storm-slop season.