Right now

Temp15°C

Wind16 km/h

Gusts24 km/h

Humidity72%

Rain 48hdry

Last rainNone recent

Assessment

1.2mm rain forecast

Tidal access: Some of the boulders on the beach are tidal — climb around low water for the seaward blocs. The upper blocs stay clear of the sea.

Good friction temperature range for dolerite

7-day forecast

Scroll through each day — hourly detail is shown inline.

Today Wednesday 16 September

Poor

Temp15°C

Rain1mm

Wind24 km/h

Gusts24 km/h

Humidity73%

1.2mm rain forecast

Good friction range for dolerite
Wet dolerite is slick — let it dry before leading
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

14:00 15° dry 16 — 72%

15:00 15° dry 22 — 70.1%

16:00 16° dry 32 — 76%

17:00 16° dry 35 — 79.7%

18:00 16° 0.1mm 37 — 82.1%

19:00 16° dry 35 — 77.6%

20:00 16° dry 30 — 75.3%

21:00 15° dry 35 — 77%

Thu Thursday 17 September

Poor

Temp15°C

Rain3mm

Wind37 km/h

Gusts—

Humidity74%

2.7mm rain forecastWindy — 37 km/h, gusts 0 km/h

Good friction range for dolerite
Wet dolerite is slick — let it dry before leading
Very windy — consider sheltered alternatives

Time °C Rain Wind (km/h) Gust Hum

06:00 15° dry 33 — 80.1%

07:00 14° 0.2mm 33 — 82.6%

08:00 14° dry 36 — 76.4%

09:00 15° 0.2mm 36 — 80.9%

10:00 15° 0.1mm 37 — 76.5%

11:00 15° dry 37 — 78.7%

12:00 15° dry 37 — 76.5%

13:00 16° dry 37 — 72.3%

14:00 16° dry 36 — 72%

15:00 16° dry 35 — 69.9%

16:00 16° dry 38 — 69.6%

17:00 16° dry 36 — 69.4%

18:00 16° dry 35 — 70.3%

19:00 16° dry 36 — 69.2%

20:00 16° dry 39 — 70.9%

21:00 15° dry 38 — 74.3%

Fri Friday 18 September

Poor

Temp16°C

Rain9mm

Wind46 km/h

Gusts—

Humidity81%

9.3mm rain forecastWindy — 46 km/h, gusts 0 km/h

Good friction range for dolerite
Wet dolerite is slick — let it dry before leading
Very windy — consider sheltered alternatives

Time °C Rain Wind (km/h) Gust Hum

06:00 14° dry 30 — 82.6%

07:00 14° dry 30 — 82.3%

08:00 15° dry 32 — 81.5%

09:00 15° dry 36 — 77.2%

10:00 15° 0.3mm 38 — 74.8%

11:00 16° dry 44 — 74.5%

12:00 16° dry 49 — 74%

13:00 16° 2mm 47 — 75.8%

14:00 15° 2mm 49 — 86%

15:00 16° 3mm 49 — 90.6%

16:00 16° 2mm 49 — 90%

17:00 17° 0.1mm 50 — 90.8%

18:00 17° dry 44 — 91.7%

19:00 17° dry 43 — 91.7%

20:00 17° dry 41 — 92%

21:00 17° dry 42 — 92.1%

Sat Saturday 19 September

Poor

Temp17°C

Rain0.5mm

Wind34 km/h

Gusts—

Humidity93%

0.5mm rain forecastHumidity 93% — potential fog

Good friction range for dolerite
Wet dolerite is slick — let it dry before leading
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 17° 0.2mm 42 — 91.8%

12:00 17° 0.1mm 34 — 93.3%

18:00 17° dry 29 — 80.4%

Sun Sunday 20 September

Good

Temp15°C

Raindry

Wind28 km/h

Gusts—

Humidity72%

Should be dry

Good friction range for dolerite
Dolerite climbs well when dry
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 14° dry 34 — 75.3%

12:00 15° dry 28 — 72%

18:00 16° dry 9 — 67.3%

Mon Monday 21 September

Good

Temp16°C

Raindry

Wind15 km/h

Gusts—

Humidity73%

Should be dry

Good friction range for dolerite
Dolerite climbs well when dry

Time °C Rain Wind (km/h) Gust Hum

06:00 14° dry 4 — 72.8%

12:00 16° dry 15 — 72.6%

18:00 16° dry 16 — 83.8%

Tue Tuesday 22 September

Good

Temp17°C

Raindry

Wind15 km/h

Gusts—

Humidity89%

Should be dry

Good friction range for dolerite
Dolerite climbs well when dry

Time °C Rain Wind (km/h) Gust Hum

06:00 16° dry 15 — 92%

12:00 17° dry 15 — 89.4%

18:00 16° dry 5 — 88.8%

Wed Wednesday 23 September

Good

Temp17°C

Raindry

Wind14 km/h

Gusts—

Humidity89%

Should be dry

Good friction range for dolerite
Dolerite climbs well when dry

Time °C Rain Wind (km/h) Gust Hum

06:00 14° dry 14 — 99.6%

12:00 17° dry 14 — 89.1%

18:00 17° dry 14 — 83.2%

Tidal access
Some of the boulders on the beach are tidal — climb around low water for the seaward blocs. The upper blocs stay clear of the sea.

About Porth Ysgo

Widely regarded as the best bouldering venue in North Wales — a scattered field of dolerite blocs on a National Trust beach at the tip of the Llŷn Peninsula, near Aberdaron. The rock is coarse-grained coastal dolerite (some call it gabbro) that offers unbeatable friction but is tough on skin in warmer temperatures. Because of its south-west aspect and open sea position, the venue thrives as a winter destination — sun on the beach all day, dry sea breezes, and rock warm enough to climb on when the mountains are frozen out. Many highball problems with barnacled or sloping landings, so pads are essential. The Incredible Shaking Man sds (Font 7B), Popcorn Party (Font 7A) and Made In Heaven (Font 6B+) are the standout problems. Tidal for the seaward blocs — check tides before heading down the steep path from Uwchmynydd.

Region: North Wales — Llŷn Peninsula
Rock type: Dolerite
Aspect: south-west-facing
Altitude: 10m
Exposure: medium
Seepage: low

Other crags in this region

Craig Dorys