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Surf Forecasts:

Castlerock surf break

Castlerock surfForecast / Londonderry / Ireland

information circle16 Day Weather and Surf, issued 5 am Wednesday 18 Mar 2026 GMT
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
7.9° C
 (Which is normal for this time of year)

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 Wednesday (Mar 18) at 9AM. The primary swell is predicted to be 0.9m and 16s period with a secondary swell of 1.0m and 12s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Castlerock in the next 16 days are 3.5m 13s and forecast to arrive on Monday (Mar 23) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 2s period and expected on Wednesday (Mar 25) at 6AM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+) 9AM (Wed 18th Mar)3ft (0.9m) 16s
Best Surf 3PM (Sat 21st Mar)8ft (2.5m) 16s
Most Powerful 6PM (Mon 23rd Mar)11ft (3.5m) 13s

Table - best surf conditions forecast for Castlerock over the next 16 days.

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table

Short Range Forecast Mostly dry. Very mild (max 13°C on Thu afternoon, min 7°C on Fri night). Wind will be generally light.

Days 3-6 Weather Summary Light rain (total 9mm), mostly falling on Sun night. Very mild (max 11°C on Sat afternoon, min 3°C on Mon night). Winds increasing (calm on Sat morning, strong winds from the NW by Mon morning).

Wednesday
18
Thursday
19
Friday
20
Saturday
21
Sunday
22
Monday
23
Tuesday
24
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
3
2
1
3
1
2
1
3
4
4
5
4
3
2
1
0
0
5
4
3
1
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.9
NW
1.4
NW
1.3
NW
1.3
NW
1.1
NW
0.9
NW
0.7
NW
1.2
NW
1.7
NW
2.4
NW
2.5
NW
2.2
NW
1.9
NW
1.9
NW
2.4
NW
3.5
NW
3.5
NW
3.5
NW
2.5
NW
2
NW
1.3
NW
Period(s) (?)161513131212111316161615141313101113131211
Wave
Graph
(?)Metric surfscale
Energy kJ (?)432795618512386228116511140227963301223314181280198224153287362119461129389
Wind
(km/h)
5
S
10
NNE
10
NNE
5
NNE
10
ENE
10
S
10
SSW
5
NE
5
S
5
SSW
5
ESE
15
S
15
SSW
10
NW
30
W
45
WNW
40
NW
15
WSW
25
S
20
SSW
20
SW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offcross-
on		onglasscrossoffoffglassoffcross-
off		cross-
off		offcross-
off		cross-
on		crosscross-
on		cross-
on		cross-
off		offcross-
off		cross-
off
High Tide
/ height (m)
5:47PM
1.69
6:07AM
2.04
6:20PM
1.76
6:40AM
2.07
6:54PM
1.79
7:15AM
2.03
7:29PM
1.78
7:51AM
1.91
8:06PM
1.72
8:30AM
1.72
8:47PM
1.61
9:14AM
1.49
9:37PM
1.47
Low Tide
/ height (m)
12:09PM
0.10
12:00AM
0.01
12:37PM
0.04
12:30AM
-0.03
1:06PM
0.02
1:02AM
-0.03
1:36PM
0.07
1:38AM
0.03
2:08PM
0.16
2:17AM
0.14
2:42PM
0.29
3:04AM
0.30
3:23PM
0.44
Wednesday
18
Thursday
19
Friday
20
Saturday
21
Sunday
22
Monday
23
Tuesday
24
Sunrise6:35--6:33--6:30--6:28--6:24--6:22--6:20--
Sunset-6:35--6:37--6:38--6:40--6:43--6:45--6:46-
cloud
cloud
part cloud
part cloud
clear
clear
clear
part cloud
clear
clear
clear
part cloud
cloud
light rain
rain showers
light rain
rain showers
rain showers
mod rain
light rain
rain showers
Rain (mm)
-------------14211633
Temp. °C9991013111213910111097655561111
Feels °C (?)765712811128887541-6-5-1-156
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • 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.

View detailed surf forecast for Castlerock at:
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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 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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