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Surf Forecasts:

Castlerock surf break

Castlerock surfForecast / Londonderry / Ireland

information circle48hr Weather and Surf, issued 5 am Tuesday 20 Jan 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
8.7° C
 (Which is normal for this time of year)

How big are the waves at Castlerock today?

The current surf forecast for Castlerock at 1PM is: 1.4m 15s primary swell from a Northwest direction (forecast issued at 05:00am January 20). An open ocean swell of 1.5m 5s is not directed at the surf break. The wind direction is predicted to be cross-offshore.

Time (GMT) & DateWave HeightWave Period
Morning (20 Jan)5ft (1.6m)15s
Afternoon (20 Jan)4.5ft (1.3m)15s
Evening (20 Jan)4ft (1.2m)14s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table
Tuesday
20
Wednesday
21
Thursday
22
Fri
23
3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM
Rating
(10 max)
4
3
2
0
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
2
2
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.8
NW
1.7
NW
1.6
NW
1.5
NW
1.3
NW
1.2
NW
1.2
NW
1.1
NW
1
NW
0.9
NW
0.9
NW
0.8
NW
0.7
NW
0.7
NW
0.6
NW
0.6
WNW
0.5
NW
0.5
NW
0.7
NW
0.9
WNW
1
WNW
1
WNW
0.9
WNW
0.9
WNW
Period(s) (?)161615151515141414131313121212121219171615141414
Wave
Graph
(?)Metric surfscale
Energy kJ (?)1571140212009627676065985213682952531991541491189667179309436468437312290
Wind
(km/h)
15
S
20
SE
30
ESE
40
SE
50
SE
45
SE
35
SSE
45
SE
35
SE
20
SE
25
SE
35
ESE
40
ESE
40
E
40
ESE
40
SE
35
SE
35
SE
30
SE
30
SE
30
SE
25
SE
15
SE
20
SSE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offcross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		crosscross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		off
High Tide
/ height (m)
7:00AM
1.84
7:02PM
1.59
7:32AM
1.88
7:35PM
1.58
8:06AM
1.88
8:09PM
1.55
Low Tide
/ height (m)
12:55AM
0.10
1:33PM
0.27
1:22AM
0.07
2:04PM
0.27
1:50AM
0.08
2:35PM
0.29
Tuesday
20
Wednesday
21
Thursday
22
Fri
23
Sunrise--8:37-------8:36-------8:34-----
Sunset----4:37-------4:39-------4:42---
part cloud
clear
cloud
cloud
light rain
light rain
light rain
rain showers
part cloud
cloud
part cloud
clear
cloud
light rain
light rain
light rain
cloud
cloud
part cloud
light rain
light rain
light rain
rain showers
clear
Rain (mm)
----3241-----122---1123-
Temp. °C657888777667679999998886
Feels °C (?)2-10-1-3-2-1-3-11-1-1-4-21122222350
  • 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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