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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
12 Day Weather and Surf, issued 5 am Wednesday 31 Dec 2025 GMTForecast 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
10.0° C
(Which is slightly warmer than usual)Best Forecast Surf Conditions for Castlerock this week:
The surf forecast for Castlerock over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Jan 07) at 6AM. The primary swell is predicted to be 0.8m and 9s period with a secondary swell of 0.4m and 13s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Castlerock in the next 12 days are 3.0m 9s and forecast to arrive on Saturday (Jan 03) at 12AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Tuesday (Jan 06) at 9AM.
| Wave Type | Time (GMT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Wed 7th Jan) | 2.5ft (0.8m) 9s |
| Best Surf | 6AM (Wed 7th Jan) | 2.5ft (0.8m) 9s |
| Most Powerful | 12AM (Sat 3rd Jan) | 10ft (3.0m) 9s |
Table - best surf conditions forecast for Castlerock over the next 12 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Moderate rain (total 14mm), heaviest on Wed night. Mild temperatures (max 8°C on Wed night, min 3°C on Wed morning). Winds increasing (light winds from the W on Wed morning, strong winds from the NW by Thu night). | Days 3-6 Weather Summary Moderate rain (total 15mm), heaviest on Mon night. Mild temperatures (max 7°C on Mon night, min 4°C on Sat afternoon). Winds decreasing (strong winds from the N on Sat morning, light winds from the NW by Sun morning). | ||||||||||||||||||||
Wednesday 31 | Thursday 01 | Friday 02 | Saturday 03 | Sunday 04 | Monday 05 | Tuesday 06 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 13 | 13 | 7 | 9 | 9 | 8 | 8 | 8 | 9 | 8 | 8 | 7 | 7 | 6 | 6 | 4 | 5 | 5 | 6 | 6 | 7 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 17 | 16 | 305 | 1051 | 1125 | 765 | 931 | 1121 | 1374 | 1058 | 669 | 232 | 108 | 40 | 22 | 12 | 21 | 9 | 8 | 40 | 67 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- on | cross- on | cross- on | on | on | on | on | on | on | on | on | cross- on | on | cross- off | cross- off | cross- off | cross- on | cross- on | cross |
High Tide / height (m) | 3:26PM 1.56 | 4:00AM 1.54 | 4:24PM 1.62 | 4:51AM 1.71 | 5:14PM 1.66 | 5:39AM 1.85 | 6:00PM 1.66 | 6:25AM 1.96 | 6:43PM 1.63 | 7:10AM 2.00 | 7:23PM 1.57 | 7:53AM 1.99 | 8:01PM 1.49 | ||||||||
Low Tide / height (m) | 9:10AM 0.44 | 9:57PM 0.33 | 10:22AM 0.32 | 10:49PM 0.25 | 11:22AM 0.20 | 11:35PM 0.16 | 12:15PM 0.12 | 12:18AM 0.10 | 1:04PM 0.10 | 12:58AM 0.05 | 1:50PM 0.13 | 1:38AM 0.04 | 2:34PM 0.21 | 2:16AM 0.08 | |||||||
Wednesday 31 | Thursday 01 | Friday 02 | Saturday 03 | Sunday 04 | Monday 05 | Tuesday 06 | |||||||||||||||
| Sunrise | 8:52 | - | - | 8:52 | - | - | 8:52 | - | - | 8:52 | - | - | 8:52 | - | - | 8:51 | - | - | 8:51 | - | - |
| Sunset | - | 4:06 | - | - | 4:07 | - | - | 4:08 | - | - | 4:09 | - | - | 4:10 | - | - | 4:13 | - | - | 4:14 | - |
 | |  | | | |  | | | | | | | |  |  | | |  | | | |
Rain (mm) | - | - | 2 | - | - | 4 | 2 | 2 | 4 | 1 | - | 2 | 2 | 1 | 2 | - | - | 7 | 1 | 2 | 2 |
| Temp. °C | 4 | 6 | 8 | 6 | 7 | 6 | 4 | 4 | 4 | 5 | 4 | 4 | 4 | 5 | 6 | 6 | 6 | 7 | 8 | 8 | 8 |
| Feels °C (?) | -1 | -1 | -1 | -4 | -4 | -5 | -7 | -7 | -7 | -6 | -6 | -4 | -1 | 0 | 1 | 0 | -1 | -2 | -2 | -1 | 2 |
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Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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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.
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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 12 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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