Portstewart Strand surf forecast from 15 Sep 2026:
- Best quality surf: Sunday 20 Sep, 4PM (local time) - 5ft (1.5m), 12s period, NW swell with cross-offshore winds.
- Most powerful swell: Thursday 17 Sep, 10PM (local time) - 11ft (3.5m), 14s period, NW swell with 4,757 kJ wave energy.
- Next surfable swell (1★+): Sunday 20 Sep, 4PM (local time) - 5ft (1.5m), 12s period with NW swell.
Best Forecast Surf Conditions for Portstewart Strand this week:
The surf forecast for Portstewart Strand over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Sep 20) at 4PM. The primary swell is predicted to be 1.5m and 12s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Portstewart Strand in the next 16 days are 3.5m 14s and forecast to arrive on Thursday (Sep 17) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 2s period and expected on Wednesday (Sep 16) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4PM (Sun 20th Sep) | 5ft (1.5m) 12s |
| Best Surf | 4PM (Sun 20th Sep) | 5ft (1.5m) 12s |
| Most Powerful | 10PM (Thu 17th Sep) | 11ft (3.5m) 14s |
Table - best surf conditions forecast for Portstewart Strand over the next 16 days.
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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