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Surf Forecasts:

Castlerock surf break

Castlerock surfForecast / Londonderry / Ireland

information circle48hr Weather and Surf, issued 11 pm Tuesday 17 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
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 6AM is: 1.2m 12s primary swell from a Northwest direction and 0.7m 18s secondary swell from a Northwest direction (forecast issued at 11:00pm March 17). The wind direction is predicted to be offshore and the swell rating is 3.

Time (GMT) & DateWave HeightWave Period
Morning (18 Mar)3ft (0.9m)16s
Afternoon (18 Mar)4.5ft (1.4m)15s
Evening (18 Mar)4.5ft (1.4m)13s

Table - waves today at Castlerock. (Swell directed towards the surf break)

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table
Wednesday
18
Thursday
19
Friday
20
9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM
Rating
(10 max)
2
3
3
3
3
3
2
2
2
1
2
3
3
1
1
2
2
2
1
1
1
2
2
1
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.4
NW
1.4
NW
1.4
NW
1.2
NW
0.9
NW
1.4
NW
1.4
NW
1.4
NW
1.4
NW
1.3
NW
1.4
NW
1.3
NW
1.3
NW
1.2
NW
1.1
NW
1.1
NW
1
NW
0.9
NW
0.8
NW
0.8
NW
0.7
NW
0.7
NW
1.1
NW
1.2
NW
Period(s) (?)131212121616151413131313131312121212111111111313
Wave
Graph
(?)Metric surfscale
Energy kJ (?)680558540435432871795787711618673529512451386324272228183145121119451488
Wind
(km/h)
20
SSW
15
SSW
10
S
10
S
5
S
5
ENE
10
NE
10
NE
10
NNE
10
NNE
10
NNE
0
NE
5
ESE
5
E
10
E
10
SSE
15
SSE
15
SSE
10
S
10
S
5
SSW
5
SW
5
NNE
10
N
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		cross-
off		offoffglassglasscross-
on		cross-
on		oncross-
on		cross-
on		glassglasscrosscrossoffoffoffoffoffoffglassonon
High Tide
/ height (m)
5:36AM
1.95
5:47PM
1.69
6:07AM
2.04
6:20PM
1.76
6:40AM
2.07
Low Tide
/ height (m)
11:31PM
0.09
12:09PM
0.10
12:00AM
0.01
12:37PM
0.04
12:30AM
-0.03
1:06PM
0.02
Wednesday
18
Thursday
19
Friday
20
Sunrise----6:35-------6:33-------6:30---
Sunset-------6:35-------6:37-------6:38
rain showers
part cloud
clear
cloud
cloud
cloud
cloud
cloud
cloud
part cloud
part cloud
clear
part cloud
part cloud
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
Rain (mm)
1-----------------------
Temp. °C108768999888881013131111101010121211
Feels °C (?)5443675644565811118877811109
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

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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.

View detailed surf forecast for Castlerock at:
surf-forecast.com

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