Castlerock Surf Forecast

/ Londonderry (4 surf breaks) /

Ireland (149 surf breaks) / Lat Long: (55.17° N 6.78° W)

Surf Forecasts:

Castlerock surfForecast / Londonderry / Ireland

12 Day Weather and Surf, issued 6 am Tuesday 16 Sep 2025 BST

Forecast 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 15.5° C
(Which is 1.7°C warmer than normal for this time of year)

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 Tuesday (Sep 16) at 10PM. The primary swell is predicted to be 0.8m and 10s period with a secondary swell of 0.1m and 9s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Castlerock in the next 12 days are 1.6m 15s and forecast to arrive on Thursday (Sep 18) at 1AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Sunday (Sep 21) at 4AM.

Wave Type	Time (BST) & Date	Wave Height & Period
Next good surf (1 star+)	10PM (Tue 16th Sep)	2.5ft (0.8m) 10s
Best Surf	1AM (Thu 18th Sep)	5ft (1.6m) 15s
Most Powerful	1AM (Thu 18th Sep)	5ft (1.6m) 15s

Table - best surf conditions forecast for Castlerock over the next 12 days.

Updates in hr min s Forecast update imminent

12 Days Hourly

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	Short Range Forecast Moderate rain (total 18mm), heaviest on Tue night. Very mild (max 17°C on Thu night, min 11°C on Tue night). Mainly fresh winds.									Days 3-6 Weather Summary Light rain (total 2mm), mostly falling on Fri night. Very mild (max 16°C on Fri afternoon, min 10°C on Sat night). Winds increasing (light winds from the SW on Fri night, strong winds from the NNE by Sat night).
	Tuesday 16			Wednesday 17			Thursday 18			Friday 19			Saturday 20			Sunday 21			Monday 22
	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night
Rating (10 max)	0	0	0	0	0	4	2	1	0	0	0	0	0	0	0	0	0	0	0	0	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	WNW	WNW	NW	WNW	W	WNW	WNW	WNW	NNW	NNW	NNW	NNW	NNW	NNW	NNE	NNE	NNE	NNW	NNW	NNW	NNW
Period(s) (?)	12	11	10	9	9	15	12	11	14	10	10	9	5	6	6	7	6	6	6	5	5
Wave Graph (?)
Energy (?)	165	124	80	39	46	1088	443	196	253	235	178	160	78	97	597	378	340	55	11	25	17
Wind (km/h)	W	WNW	SSE	SW	SW	SSW	S	SSE	SW	SSW	SW	W	NNW	N	NNE	NNE	N	N	N	N	NNW
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross	cross	cross- off	cross- off	cross- off	off	off	off	cross- off	cross- off	cross- off	cross	on	on	on	on	on	on	on	on	cross- on
High Tide / height (m)		3:16PM 1.34		4:05AM 1.16	4:28PM 1.52		4:55AM 1.29	5:15PM 1.69		5:31AM 1.41	5:51PM 1.82		6:03AM 1.51	6:23PM 1.90		6:32AM 1.59	6:52PM 1.94		7:00AM 1.65		7:19PM 1.93
Low Tide / height (m)			10:15PM 0.55	10:07AM 0.54		11:15PM 0.41	11:01AM 0.38		11:55PM 0.29	11:40AM 0.23		12:27AM 0.21	12:13PM 0.13		12:55AM 0.16	12:43PM 0.06		1:20AM 0.13		1:12PM 0.04	1:44AM 0.13

	Tuesday 16			Wednesday 17			Thursday 18			Friday 19			Saturday 20			Sunday 21			Monday 22
Sunrise	7:00	-	-	7:01	-	-	7:03	-	-	7:05	-	-	7:07	-	-	7:09	-	-	7:11	-	-
Sunset	-	7:43	-	-	7:39	-	-	7:37	-	-	7:35	-	-	7:31	-	-	7:30	-	-	7:27	-

Rain (mm)	1	-	12	-	-	-	1	4	-	-	-	1	-	-	1	-	-	-	-	-	4
Temp. °C	14	14	14	16	16	13	14	16	17	15	16	13	12	12	12	11	11	11	12	12	12
Feels °C (?)	9	9	9	10	11	7	12	15	12	10	12	10	4	4	3	2	2	2	5	5	10

Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)

Recent Eyeball Surf Reports for Londonderry

Wind Update The wind is still cross-off at Castlerock (light winds from the W at Magilligan Number 2 11 km from Castlerock). 1.9m 6s windswell from the NW to make surfable waves.
1 hour 34 minutes ago Castlerock

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1 h 34 min ago

19 km/h

Cross-Off

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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.

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.