Surf Forecasts:
Castlerock surf forecast from 5 Sep 2026:
- Best quality surf: Saturday 5 Sep, 4PM (local time) - 4ft (1.2m), 10s period, NW swell with cross-offshore winds.
- Most powerful swell: Tuesday 8 Sep, 10AM (local time) - 10ft (3.0m), 12s period, NW swell with 2,169 kJ wave energy.
- Next surfable swell (1★+): Saturday 5 Sep, 4PM (local time) - 4ft (1.2m), 10s period with NW swell.
Best Forecast Surf Conditions for Castlerock this week:
The surf forecast for Castlerock over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Sep 05) at 4PM. The primary swell is predicted to be 1.2m and 10s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Castlerock in the next 16 days are 3.0m 12s and forecast to arrive on Tuesday (Sep 08) at 10AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Monday (Sep 07) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4PM (Sat 5th Sep) | 4ft (1.2m) 10s |
| Best Surf | 4PM (Sat 5th Sep) | 4ft (1.2m) 10s |
| Most Powerful | 10AM (Tue 8th Sep) | 10ft (3.0m) 12s |
Table - best surf conditions forecast for Castlerock over the next 16 days.
Short Range ForecastLight rain (total 5mm), mostly falling on Sun afternoon. Very mild (max 19°C on Sun afternoon, min 12°C on Mon night). Winds increasing (light winds from the WSW on Sat afternoon, strong winds from the WSW by Mon night). | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Thu night. Very mild (max 17°C on Thu afternoon, min 11°C on Wed night). Winds decreasing (fresh winds from the WNW on Tue morning, light winds from the WSW by Wed afternoon). | ||||||||||||||||||||
Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | NW 11 | NW 10 | NW 9 | NW 8 | NW 8 | WNW 11 | WNW 7 | WNW 11 | WNW 11 | NW 12 | NW 11 | NW 10 | NW 9 | NW 8 | WNW 8 | WNW 7 | WNW 8 | WNW 8 | NW 7 | NW 7 | NW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 533 | 262 | 109 | 41 | 15 | 12 | 48 | 275 | 711 | 2169 | 1570 | 788 | 294 | 138 | 42 | 21 | 13 | 11 | 127 | 217 | 392 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | off | off | off | cross-off | off | cross-off | cross-off | cross | cross-on | cross-on | cross | cross | off | off | off | off | cross-on | cross-on | cross-on |
High Tide | 1:05PM1.23m | 2:14AM1.15m | 3:13PM1.33m | 3:55AM1.24m | 4:26PM1.54m | 4:53AM1.37m | 5:16PM1.76m | 5:36AM1.49m | 5:58PM1.94m | 6:13AM1.60m | 6:36PM2.05m | 6:48AM1.67m | 7:11PM2.08m | ||||||||
Low Tide | 8:00PM0.66m | 8:41AM0.64m | 10:04PM0.55m | 10:11AM0.50m | 11:12PM0.38m | 11:05AM0.32m | 11:58PM0.22m | 11:48AM0.16m | 00:37AM0.11m | 12:25PM0.03m | 1:11AM0.05m | 12:59PM-0.04m | 1:42AM0.04m | ||||||||
 | |  |  |  |  |  | |  | | |  | | |  |  | |  | | | | |
 | 6:39 | — | — | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — | 6:46 | — | — | 6:48 | — | — | 6:50 | — | — |
 | — | 8:10 | — | — | 8:07 | — | — | 8:06 | — | — | 8:02 | — | — | 8:00 | — | — | 7:58 | — | — | 7:54 | — |
mm | — | — | — | — | 1 | 1 | 1 | 1 | 1 | 2 | 1 | — | — | — | — | — | — | 8 | — | — | — |
Temp °C | 16 | 16 | 15 | 18 | 19 | 15 | 13 | 14 | 13 | 14 | 14 | 13 | 14 | 14 | 14 | 16 | 17 | 14 | 14 | 14 | 13 |
Feels °C | 13 | 14 | 13 | 15 | 15 | 11 | 7 | 8 | 5 | 7 | 7 | 8 | 10 | 11 | 11 | 14 | 14 | 10 | 8 | 8 | 9 |
Swell 1 Height (m) Direction Period (s) | NW 11 | NW 10 | NW 9 | NW 8 | NW 8 | WNW 6 | WNW 7 | WNW 11 | WNW 11 | — | — | NW 10 | NW 9 | NW 8 | WNW 8 | WNW 7 | WNW 8 | WNW 8 | — | — | NW 10 |
| kJ | 533 | 262 | 109 | 41 | 15 | 7 | 48 | 275 | 711 | — | — | 788 | 294 | 138 | 42 | 21 | 13 | 11 | — | — | 392 |
Swell 2 Height (m) Direction Period (s) | — | — | — | E 6 | WNW 8 | WNW 11 | WNW 14 | — | NW 14 | — | — | — | — | — | NNW 8 | NNW 7 | NW 7 | WNW 10 | — | — | — |
| kJ | — | — | — | 1 | 14 | 12 | 39 | — | 293 | — | — | — | — | — | 37 | 5 | 2 | 9 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SE 7 | ESE 4 | — | — | — | — | — | — | — | — | — | — | N 7 | N 7 | — | — | — |
| kJ | — | — | — | — | 2 | 2 | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | SE 3 | SSE 3 | W 3 | SSW 3 | W 4 | SSW 3 | NW 12 | NW 11 | — | — | — | — | SE 2 | SE 3 | — | NW 7 | NW 7 | — |
| kJ | — | — | — | 2 | 6 | 2 | 3 | 16 | 2 | 2169 | 1570 | — | — | — | — | 1 | 1 | — | 127 | 217 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 187 | 0 | 0 | 390 | 404 | 339 | 323 | 772 | 380 | 380 | 771 | 413 | 246 | 9 | 2 | 63 | 71 | 328 | 382 | 398 | 0 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||
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FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Castlerock surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Castlerock Surf forecast
The above surf forecast table for Castlerock provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Castlerock can be found by selecting the local surf guide option on the grey menu. Our Castlerock surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Castlerock) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Castlerock may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Are you planning a holiday in Londonderry? If you are looking for accommodation near Castlerock, camping, hotels and holiday cottages in Londonderry, consider staying in Coleraine which is 8 km (5 miles) away. Other places in and around Londonderry where you can find information about places to rent, and car hire include Ballycastle which is 34 km (21 miles) away, Ballypatrick, Londonderry County Borough and Derry.
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