Panama Viejo seasonal overview
Panama Viejo is a micro-swell spot with a tropical heartbeat. The beach faces southeast, so any south-southwest groundswell that finds the coast is aiming straight into the sand. The wind regime is the silver lining: from January through early spring, the North Atlantic high-pressure system funnels strong NNW and NW winds across the isthmus, creating frequent offshore conditions. The problem is that the dry-season swell is tiny. The year is a battle between a small but steady diet of southern-hemisphere groundswell and the local wind balance. In short, 'best' here is relative, but the wet season does bring noticeably more life.
Best Surf Season (May - November)
As the Intertropical Convergence Zone drifts north and the eastern Pacific tropical season begins, wave heights at Panama Viejo become more rideable. Average heights climb from 0.3m to around 0.5m (1.5ft), and the percentage of 2-3ft (0.6-1m) SSW swell increases significantly. Offshore NNW/NW wind windows remain common, especially in the morning, while the afternoon sea breeze becomes more of a factor. This is the most consistent stretch of the year, with the best combination of small-but-real swell and clean tropical surface conditions. It still won't be pumping, but it will be surfable.
Fair Surf Season (December & April)
These are transitional months where average swell heights hover near 0.4m (1.3ft) and wave periods stay long. December is blessed with powerful offshore NNW/NW winds and a still-warm ocean, while April catches the first strengthening pulses of southern-hemisphere swell. Both months offer clean, groomed conditions but not much size. If you are happy riding fat micro-swell on a longboard, these windows can be enjoyable.
Low Surf Season (January - March)
This is the core flat spell. Average wave heights drop to 0.3m (1ft) and almost all of the SSW energy falls into the 0-0.5m category. Long-period swell may show on the buoy - 11.5 to 13.1 seconds - but there simply is not enough amplitude to create a breaking wave at Panama Viejo. The winds are consistently offshore and the weather is pleasant, but the ocean is often completely flat. If you see a 2-3ft (0.6-1m) day in this window, drop everything.