Portstewart Strand Surf Break

Portstewart Strand Surf Forecast and Surf Report

Lat Long: 55.17° N 6.75° W

Issued: 6 pm 18 Jun 2026 (local time)

Forecast update in  hr  min

Today's Portstewart Strand sea temperature is
12.6° C

Normal for this time of year

Portstewart Strand surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Portstewart Strand surf forecast from 18 Jun 2026:

  • Best quality surf: Tuesday 23 Jun, 10PM (local time) - 4ft (1.2m), 11s period, WNW swell with glassy winds.
  • Most powerful swell: Wednesday 24 Jun, 1AM (local time) - 4ft (1.2m), 11s period, NW swell with 347 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 23 Jun, 10PM (local time) - 4ft (1.2m), 11s period with WNW swell.

Best Forecast Surf Conditions for Portstewart Strand this week:

The surf forecast for Portstewart Strand over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Jun 23) at 10PM. The primary swell is predicted to be 1.2m and 11s period. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Portstewart Strand in the next 16 days are 1.2m 11s and forecast to arrive on Wednesday (Jun 24) at 1AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 2s period and expected on Friday (Jun 19) at 4AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)10PM (Tue 23rd Jun)4ft (1.2m) 11s
Best Surf10PM (Tue 23rd Jun)4ft (1.2m) 11s
Most Powerful 1AM (Wed 24th Jun)4ft (1.2m) 11s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Moderate rain (total 13mm), heaviest on Thu afternoon. Very mild (max 17°C on Sat afternoon, min 11°C on Fri night). Winds decreasing (fresh winds from the WSW on Thu night, calm by Sat night).

Days 5-7 Weather Summary

Mostly dry. Warm (max 22°C on Wed morning, min 14°C on Tue afternoon). Wind will be generally light.

Thu
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
1
1
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.4
WNW
10
0.4
WNW
9
0.4
WNW
9
0.4
NW
8
0.4
NW
8
0.4
NW
7
0.4
NW
7
0.5
NW
7
0.6
NW
7
0.6
NW
7
0.6
NW
8
0.4
NW
7
0.4
NW
7
0.4
NW
7
0.4
NW
7
0.8
WNW
9
1.2
NW
11
1
NW
10
0.9
NW
9
0.8
NW
9
0.7
NW
8
Wave Graph
Metric surfscale
Energy kJ
37
32
30
22
14
12
11
25
31
31
36
18
17
13
12
96
347
181
132
109
57
Wind (km/h)
15
SSE
10
ESE
5
W
10
ENE
10
W
15
WSW
15
WNW
0
W
5
ENE
15
NNE
0
SE
10
SSE
5
SE
5
S
10
W
10
N
5
ENE
15
SE
20
SE
10
SE
10
SSE
Wind State
off
off
glassy
cross-off
cross-on
cross
on
glassy
cross-off
cross
glassy
cross-off
glassy
glassy
cross-on
cross-on
glassy
off
off
off
cross-off
High Tide
9:36PM1.90m
9:49AM1.38m
10:29PM1.81m
10:39AM1.27m
11:26PM1.70m
11:36AM1.18m
00:28AM1.57m
12:47PM1.13m
1:37AM1.46m
2:09PM1.14m
2:45AM1.39m
3:22PM1.21m
3:44AM1.35m
Low Tide
4:25AM0.28m
4:05PM0.19m
5:20AM0.38m
4:55PM0.27m
6:17AM0.47m
5:50PM0.37m
7:15AM0.53m
6:52PM0.47m
8:15AM0.56m
8:02PM0.54m
9:13AM0.56m
9:18PM0.57m
10:07AM0.52m
light rain
light rain
cloud
light rain
rain showers
clear
part cloud
clear
clear
clear
clear
cloud
part cloud
part cloud
cloud
cloud
part cloud
clear
part cloud
light rain
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:46
4:46
4:46
4:46
4:46
4:47
4:47
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
10:09
10:09
10:09
10:10
10:10
10:10
10:10
10:10
 mm
3
5
3
2
2
3
Temp °C
15
16
13
13
12
16
17
13
15
17
16
19
20
17
16
15
16
22
22
20
20
Feels °C
14
14
12
13
11
12
13
12
13
15
14
18
19
17
15
14
16
21
20
20
21
Swell 1
Height (m)
Direction
Period (s)
0.4
WNW
10
0.4
WNW
9
0.4
WNW
9
0.4
NW
8
0.4
NW
8
0.4
NW
7
0.4
NW
7
0.5
NW
7
0.6
NW
7
0.6
NW
7
0.6
NW
8
0.4
NW
7
0.4
NW
7
0.4
NW
7
0.4
NW
7
1.2
NW
11
1
NW
10
0.9
NW
9
0.8
NW
9
0.7
NW
8
Energy kJ
37
32
30
22
14
12
11
25
31
31
36
18
17
13
12
347
181
132
109
57
Swell 2
Height (m)
Direction
Period (s)
0.2
ESE
5
0.2
ESE
6
0.2
NNE
3
0.2
WNW
9
0.1
W
13
Energy kJ
2
4
1
8
3
Swell 3
Height (m)
Direction
Period (s)
0.1
N
9
Energy kJ
2
Wind waves
Height (m)
Direction
Period (s)
0.2
ESE
3
0.1
SE
4
0.2
WNW
3
0.8
WNW
9
Energy kJ
1
1
1
96
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
3
2
1
1
1
1
Distance (km)
12
14
43
42
43
295
298
43
29
42
14
42
85
111
43
43
0
0
0
0
0
Best forecast wave conditions in Londonderry
Rating
(10 max)
2
1
1
1
1
Best forecast wave conditions in Ireland
Rating
(10 max)
2
2
1
1
1
1
1
1
1
1
1
1
1
2
3
3
2
2
2
1
Header Global
Rating
(10 max)
5
6
4
4
5
9
8
9
7
7
6
7
5
5
5
6
7
6
6
6
9
  • 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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Information about the Portstewart Strand Surf forecast

The above surf forecast table for Portstewart Strand provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Portstewart Strand can be found by selecting the local surf guide option on the grey menu. Our Portstewart Strand 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 (Portstewart Strand) 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 Portstewart Strand 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 Portstewart Strand, camping, hotels and holiday cottages in Londonderry, consider staying in Coleraine which is 6 km (4 miles) away. Other places in and around Londonderry where you can find information about places to rent, and car hire include Ballycastle which is 32 km (20 miles) away, Ballypatrick, Derry and Londonderry County Borough.

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