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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 6 pm Thursday 30 Apr 2026 BSTForecast update in hr min s Forecast update imminent
Castlerock surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Castlerock sea temperature is
10.1° C
(Which is slightly warmer than usual)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 10PM is: 1.0m 13s primary swell from a Northwest direction (forecast issued at 06:00pm April 30). An open ocean swell of 0.4m 4s is not directed at the surf break. The wind direction is predicted to be cross-offshore and the swell rating is 2.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (30 Apr) | - | - |
| Afternoon (30 Apr) | 3.5ft (1.1m) | 14s |
| Evening (30 Apr) | 3.5ft (1.0m) | 13s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 6mm), mostly falling on Thu night. Very mild (max 17°C on Fri afternoon, min 9°C on Fri night). Wind will be generally light. | ||||||||||||||||||||||||
Thu 30 | Friday 1 | Saturday 2 | Sun 3 | |||||||||||||||||||||
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 | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
NW 13 | NW 13 | NW 13 | NW 13 | NW 12 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 11 | NW 10 | NW 11 | NW 10 | NW 10 | NW 10 | NW 10 | NW 10 | NW 10 | NW 10 | NW 10 | NW 10 | |
451 | 380 | 325 | 320 | 300 | 236 | 197 | 190 | 150 | 142 | 142 | 137 | 134 | 132 | 159 | 156 | 173 | 147 | 144 | 141 | 138 | 136 | 76 | 88 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-on | on | off | cross-off | off | off | glassy | cross-on | cross-on | cross-on | cross-on | cross-on | glassy | on | on | |
High Tide | 6:22PM1.63m | 6:36AM1.75m | 6:51PM1.68m | 7:05AM1.70m | 7:21PM1.71m | 7:34AM1.63m | ||||||||||||||||||
Low Tide | 00:36AM0.19m | 12:58PM0.18m | 1:09AM0.19m | 1:23PM0.19m | 1:42AM0.22m | |||||||||||||||||||
 | |  |  |  |  |  | |  | | | |  | | | | |  | | | | | | | |
 | — | — | — | — | 5:47 | — | — | — | — | — | — | — | 5:45 | — | — | — | — | — | — | — | 5:43 | — | — | — |
 | — | 9:00 | — | — | — | — | — | — | — | 9:01 | — | — | — | — | — | — | — | 9:04 | — | — | — | — | — | 9:06 |
— | — | — | — | 2 | 1 | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | 1 | |
Temp °C | 15 | 15 | 14 | 13 | 11 | 11 | 11 | 14 | 17 | 14 | 11 | 11 | 10 | 9 | 11 | 12 | 12 | 12 | 10 | 9 | 9 | 9 | 10 | 9 |
9 | 11 | 11 | 10 | 8 | 8 | 8 | 12 | 15 | 12 | 10 | 10 | 8 | 7 | 9 | 11 | 10 | 10 | 7 | 7 | 7 | 8 | 7 | 6 | |
Swell 1 Height (m) Direction Period (s) | NW 13 | NW 13 | NW 13 | NW 13 | NW 12 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 11 | NW 10 | NW 11 | NW 10 | NW 10 | NW 10 | NW 10 | NW 10 | NW 10 | NW 10 | NW 10 | NW 10 |
 kJ | 451 | 380 | 325 | 320 | 300 | 236 | 197 | 190 | 150 | 142 | 142 | 137 | 134 | 132 | 159 | 156 | 173 | 147 | 144 | 141 | 138 | 136 | 76 | 88 |
Swell 2 Height (m) Direction Period (s) | — | — | ESE 4 | — | — | — | — | ESE 3 | E 3 | E 4 | E 4 | E 4 | E 4 | — | — | — | — | — | — | ESE 4 | — | — | NNW 7 | NNW 8 |
| kJ | — | — | 6 | — | — | — | — | 2 | 1 | 1 | 1 | 1 | 1 | — | — | — | — | — | — | 1 | — | — | 43 | 44 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | ESE 4 | ESE 4 | — | ESE 4 | ESE 3 | ESE 4 | ESE 3 | — | — | — | — | — | — | — | — | — | — | — | ESE 4 | — | — | — | — | — |
| kJ | 20 | 15 | — | 3 | 2 | 7 | 2 | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 41 | 2 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 9 | 4 | 0 | 0 | 0 | 0 | 0 | 16 | 16 | 16 | 8 | 2 | 0 | 63 | 76 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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