Porth Colmon surfForecast / Wales – Lleyn / UK

information circle12 Day Weather and Surf, issued 6 am Wednesday 02 Jul 2025 BST
Forecast update in hr  min  s Forecast update imminent
Porth Colmon surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Porth Colmon sea temperature is
15.3° C
(Which is 1.0°C warmer than normal for this time of year)


Best Forecast Surf Conditions for Porth Colmon this week:

The most powerful waves expected at Porth Colmon in the next 12 days are 1.8m 6s and forecast to arrive on Saturday (Jul 05) at 4AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 5s period and expected on Monday (Jul 07) at 4PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 4AM (Sat 5th Jul)6ft (1.8m) 6s

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

Updates in  hr  min  s Forecast update imminent
Wednesday
02
Thursday
03
Friday
04
Saturday
05
Sunday
06
Monday
07
Tuesday
08
Wednesday
09
Thursday
10
Friday
11
Saturday
12
Sunday
13
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.6
N
0.2
WSW
0.2
WSW
0.4
SW
0.6
SW
0.7
WSW
0.8
SW
1.6
SW
1.8
SW
1.8
SW
1.8
SW
1.1
SW
1.4
NW
1.8
NW
1.5
NNW
1
NNW
0.4
SW
0.4
SW
0.2
WSW
0.2
WSW
0.4
SW
0.3
SW
0.7
SW
0.8
SW
0.6
SW
0.5
SW
0.4
SW
0.4
SW
0.3
SW
0.4
SW
0.6
SW
0.7
SW
0.6
SW
0.6
WSW
0.7
NNW
0.7
NW
Period(s) (?)599534466667666563763445655554444444
Wave
Graph
(?)Metric surfscale
Energy (?)26813131017181632732822591221742771816625346331332191412756111714202316
Wind
(km/h)
15
NNW
10
W
15
NW
15
SW
25
SW
20
W
35
SW
45
SSW
35
SW
25
SW
30
SW
35
WSW
35
WNW
30
NW
40
NW
40
NW
20
NW
20
NNW
15
WNW
15
SSW
15
WSW
25
WSW
15
WSW
25
WSW
20
WSW
25
SW
15
SSW
20
SSW
25
SSW
20
SW
25
SW
25
SSW
15
NW
10
N
5
NW
10
SW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
cross-
on
oncrosscross-
off
cross-
on
crosscross-
off
crosscrosscrosscross-
on
cross-
on
onononononcross-
on
cross-
off
cross-
on
cross-
on
crosscross-
on
crosscrosscross-
off
cross-
off
cross-
off
crosscrosscross-
off
oncross-
on
glasscross
High Tide
/ height (m)
2:16PM
2.95
2:37AM
3.25
3:16PM
2.84
3:38AM
3.06
4:21PM
2.81
4:44AM
2.95
5:24PM
2.86
5:46AM
2.94
6:19PM
2.97
6:41AM
3.01
7:07PM
3.12
7:28AM
3.12
7:50PM
3.29
8:10AM
3.26
8:29PM
3.48
8:48AM
3.39
9:07PM
3.67
9:25AM
3.50
9:44PM
3.84
10:02AM
3.58
10:21PM
3.98
10:40AM
3.63
10:59PM
4.07
Low Tide
/ height (m)
8:48PM
1.16
9:33AM
1.06
9:39PM
1.29
10:24AM
1.18
10:40PM
1.37
11:22AM
1.25
11:50PM
1.36
12:26PM
1.23
12:59AM
1.26
1:25PM
1.14
1:56AM
1.09
2:16PM
1.00
2:44AM
0.91
3:00PM
0.84
3:28AM
0.73
3:41PM
0.69
4:09AM
0.57
4:20PM
0.58
4:49AM
0.45
4:57PM
0.51
5:29AM
0.38
5:35PM
0.49
Wednesday
02
Thursday
03
Friday
04
Saturday
05
Sunday
06
Monday
07
Tuesday
08
Wednesday
09
Thursday
10
Friday
11
Saturday
12
Sunday
13
Sunrise4:58--4:58--4:58--5:00--5:01--5:01--5:03--5:03--5:05--5:05--5:07--5:07--
Sunset-9:45--9:45--9:45--9:45--9:44--9:44--9:43--9:42--9:40--9:39--9:39--9:38-
part cloudpart cloudclearclearpart cloudpart cloudpart cloudlight rainlight raincloudpart cloudpart cloudpart cloudcloudpart cloudclearpart cloudclearpart cloudpart cloudcloudcloudcloudcloudpart cloudpart cloudpart cloudclearclearpart cloudpart cloudclearclearclearclearclear
Rain (mm)
-------21---------------------------
Temp. °C131416131516141415151615141514141515131617171818171819171718171918131516
Feels °C (?)9121391112861011129710681112111415141615141517151416141516121414

Short Range Forecast: Light rain (total 3mm), mostly falling on Fri afternoon. Very mild (max 16°C on Wed night, min 12°C on Wed night). Winds increasing (light winds from the W on Wed afternoon, strong winds from the SW by Fri afternoon).

Days 3-6 Weather Summary Mostly dry. Very mild (max 16°C on Sat afternoon, min 12°C on Sun night). Winds decreasing (strong winds from the NW on Sun night, light winds from the NW by Mon afternoon).

Days 6-9 Weather Summary Mostly dry. Very mild (max 19°C on Thu night, min 12°C on Tue morning). Wind will be generally light.

Long Range Forecast: Mostly dry. Very mild (max 19°C on Sat afternoon, min 12°C on Sun morning). Wind will be generally light.

  • 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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Information about the Porth Colmon Surf forecast

The above surf forecast table for Porth Colmon provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Porth Colmon can be found by selecting the local surf guide option on the grey menu. Our Porth Colmon 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 (Porth Colmon) 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 Porth Colmon 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 Lleyn Peninsula? If you are looking for accommodation near Porth Colmon, camping, hotels and holiday cottages in Lleyn Peninsula, consider staying in Porthmadog which is 37 km (23 miles) away. Other places in and around Lleyn Peninsula where you can find information about places to rent, and car hire include Anglesey which is 42 km (26 miles) away, Holyhead, Bangor and Aberystwyth.

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