- Forecast
- Maps
- Live
- Weather State
- Spot Information
Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 11 am Friday 20 Mar 2026 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
8.0° C
(Which is normal for this time of year)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 5PM is: 1.2m 13s primary swell from a Northwest direction (forecast issued at 11:00am March 20). The wind direction is predicted to be onshore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Mar) | 2ft (0.6m) | 11s |
| Afternoon (20 Mar) | 4ft (1.2m) | 13s |
| Evening (20 Mar) | 4.5ft (1.3m) | 13s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Friday 20 | Saturday 21 | Sunday 22 | Monday 23 | |||||||||||||||||||||
| 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 11 | 14 | 13 | 13 | 13 | 15 | 15 | 14 | 15 | 16 | 16 | 15 | 15 | 15 | 14 | 14 | 14 | 13 | 14 | 14 | 14 | 14 | 14 | 14 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 96 | 197 | 503 | 488 | 618 | 1349 | 1650 | 1728 | 2293 | 2658 | 2844 | 2736 | 2392 | 2061 | 1761 | 1438 | 1233 | 1474 | 2094 | 3099 | 3373 | 3647 | 3364 | 3709 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | glass | glass | on | off | cross- off | cross- off | cross- off | cross- off | glass | glass | off | off | off | off | cross- off | cross- off | cross | cross- on | cross- on | cross- on | cross- on | cross | cross- off |
High Tide / height (m) | 6:40AM 2.07 | 6:54PM 1.79 | 7:15AM 2.03 | 7:29PM 1.78 | 7:51AM 1.91 | 8:06PM 1.72 | ||||||||||||||||||
Low Tide / height (m) | 1:06PM 0.02 | 1:02AM -0.03 | 1:36PM 0.07 | 1:38AM 0.03 | 2:08PM 0.16 | 2:17AM 0.14 | ||||||||||||||||||
Friday 20 | Saturday 21 | Sunday 22 | Monday 23 | |||||||||||||||||||||
| Sunrise | 6:30 | - | - | - | - | - | - | - | 6:28 | - | - | - | - | - | - | - | 6:24 | - | - | - | - | - | - | - |
| Sunset | - | - | - | 6:38 | - | - | - | - | - | - | - | 6:40 | - | - | - | - | - | - | - | 6:43 | - | - | - | - |
 | | | |  | | |  |  | | | | | | | |  | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 9 | 13 | 13 | 11 | 9 | 9 | 8 | 7 | 7 | 10 | 12 | 12 | 10 | 8 | 8 | 8 | 8 | 9 | 8 | 8 | 7 | 6 | 6 | 5 |
| Feels °C (?) | 6 | 12 | 12 | 9 | 7 | 6 | 4 | 4 | 4 | 8 | 10 | 10 | 6 | 4 | 4 | 4 | 4 | 4 | 1 | 1 | 1 | 0 | 1 | 0 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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.
Nearest