Surf Forecasts:
How big are the waves at Portstewart Strand today (20 Sep):
- Morning surf: Morning surf (20 Sep, local time) - 8ft (2.4m), 12s period with NW swell.
- Afternoon surf: Afternoon surf (20 Sep, local time) - 6ft (1.8m), 11s period with NW swell.
- Evening surf: Evening surf (20 Sep, local time) - 5ft (1.6m), 11s period with NW swell.
The current surf forecast for Portstewart Strand at 7PM is: 1.6m 11s primary swell from a Northwest direction (forecast issued at 12:00pm September 20). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Sep) | 8ft (2.4m) | 12s |
| Afternoon (20 Sep) | 6ft (1.8m) | 11s |
| Evening (20 Sep) | 5ft (1.6m) | 11s |
Table - waves today at Portstewart Strand. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 14mm), heaviest on Tue afternoon. Warm (max 22°C on Mon afternoon, min 11°C on Tue night). Winds decreasing (fresh winds from the WNW on Sun morning, calm by Tue afternoon). | |||||||||||||||||||||
Sun 20 | Monday 21 | Tuesday 22 | |||||||||||||||||||
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 | 4 PM | 7 PM | 10 PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | NW 12 | NW 11 | NW 11 | NW 11 | NW 12 | NW 13 | NW 12 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 10 | WNW 10 | WNW 10 | WNW 10 | NW 14 | NW 15 | NW 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1470 | 866 | 671 | 564 | 638 | 653 | 430 | 361 | 309 | 220 | 179 | 140 | 117 | 115 | 106 | 64 | 121 | 90 | 58 | 318 | 558 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | off | off | cross-off | cross-off | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | on | on | glassy | cross-on | cross-on |
High Tide | 3:29PM1.15m | 3:56AM1.03m | 4:25PM1.30m | 4:33AM1.16m | 4:57PM1.46m | ||||||||||||||||
Low Tide | 7:54AM0.76m | 9:57PM0.75m | 9:43AM0.65m | 10:51PM0.62m | 10:35AM0.50m | ||||||||||||||||
 |  | |  |  | |  | | | | | |  | | | | |  | | | | |
 | 7:07 | — | — | — | — | — | — | 7:09 | — | — | — | — | — | — | — | 7:11 | — | — | — | — | — |
 | — | — | — | 7:31 | — | — | — | — | — | — | — | 7:29 | — | — | — | — | — | — | — | 7:27 | — |
mm | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | 2 | 3 | 2 | 1 |
Temp °C | 13 | 14 | 14 | 13 | 13 | 13 | 13 | 15 | 16 | 20 | 22 | 21 | 19 | 17 | 16 | 15 | 14 | 12 | 12 | 12 | 11 |
Feels °C | 7 | 9 | 10 | 11 | 10 | 9 | 9 | 13 | 15 | 19 | 21 | 20 | 18 | 15 | 14 | 12 | 12 | 11 | 12 | 11 | 10 |
Swell 1 Height (m) Direction Period (s) | NW 11 | NW 11 | NW 11 | NW 11 | NW 12 | NW 13 | NW 12 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | NW 15 | NW 15 |
| kJ | 1132 | 866 | 671 | 564 | 638 | 653 | 430 | 361 | 309 | 220 | 179 | 140 | 117 | 115 | 106 | 64 | 121 | 90 | 58 | 318 | 558 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | NNW 8 | — | — | — | — | — | — | — | — | WNW 12 | — | NW 19 | NW 14 | NW 9 | — |
| kJ | — | — | — | — | — | — | 7 | — | — | — | — | — | — | — | — | 56 | — | 15 | 53 | 3 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | WNW 18 | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 31 | — | — |
Wind waves Height (m) Direction Period (s) | NW 12 | — | — | — | — | — | — | S 2 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 1470 | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 319 | 163 | 163 | 7 | 0 | 0 | 2 | 2 | 2 | 2 | 2 | 0 | 0 | 0 | 2 | 2 | 7 | 43 | 0 | 42 | 42 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||
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