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Portstewart Strand Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Portstewart Strand surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 6 pm Wednesday 17 Sep 2025 BST
How big are the waves at Portstewart Strand today?
The current surf forecast for Portstewart Strand at 12AM is: 1.6m 14s primary swell from a West-northwest direction and 0.1m 8s secondary swell from a North direction, 0.8m 4s secondary swell from a Southwest direction (forecast issued at 06:00pm September 17). The wind direction is predicted to be cross-shore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Sep) | 5ft (1.6m) | 12s |
| Afternoon (18 Sep) | 4ft (1.2m) | 10s |
| Evening (18 Sep) | 2.5ft (0.7m) | 13s |
Table - waves today at Portstewart Strand. (Swell directed towards the surf break)
Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | |||||||||||||||||||||
| 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 9 | 14 | 15 | 14 | 13 | 13 | 12 | 11 | 10 | 13 | 13 | 12 | 10 | 9 | 9 | 9 | 11 | 13 | 12 | 11 | 6 | 10 | 8 | 9 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 28 | 366 | 857 | 1143 | 1002 | 998 | 647 | 476 | 286 | 102 | 173 | 440 | 178 | 128 | 69 | 68 | 102 | 312 | 322 | 130 | 62 | 902 | 1118 | 1480 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | cross | cross | cross | cross | cross | cross | cross- off | off | off | cross- off | cross- off | cross | cross | cross- off | cross | cross- off | cross- off | cross- off | cross- off | cross- off | cross | cross | cross- off |
High Tide / height (m) | 4:28PM 1.52 | 4:55AM 1.29 | 5:15PM 1.69 | 5:31AM 1.41 | 5:51PM 1.82 | 6:03AM 1.51 | ||||||||||||||||||
Low Tide / height (m) | 11:15PM 0.41 | 11:01AM 0.38 | 11:55PM 0.29 | 11:40AM 0.23 | 12:27AM 0.21 | 12:13PM 0.13 | ||||||||||||||||||
Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 7:03 | - | - | - | - | - | - | - | 7:05 | - | - | - | - | - | - | - | 7:07 | - |
| Sunset | - | 7:39 | - | - | - | - | - | - | - | 7:37 | - | - | - | - | - | - | - | 7:35 | - | - | - | - | - | - |
 | |  |  | | |  | |  | | |  | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | 3 | 3 | - | 1 | 1 | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 16 | 15 | 14 | 14 | 13 | 13 | 13 | 15 | 12 | 13 | 16 | 17 | 16 | 13 | 13 | 15 | 15 | 14 | 13 | 12 | 12 | 11 | 13 | 14 |
| Feels °C (?) | 10 | 9 | 7 | 7 | 6 | 7 | 8 | 12 | 9 | 11 | 14 | 16 | 11 | 9 | 9 | 11 | 12 | 11 | 10 | 9 | 9 | 7 | 10 | 13 |
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Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Londonderry
Still cross-shore at Portstewart Strand (fresh winds from the SW at Magilligan Number 2 13 km from Portstewart Strand). 2.8m 3s local chop from the SW with a 1.8m 15s groundswell from the NW. 2 swells combining so expect closeout sets.
1 h 9 min ago
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