Crags

Gabbro at Porth Ysgo is non-porous and dries very quickly, so the light scattered showers of recent days (2.2mm on May 2, 2.1mm on May 3, 0.4mm today including 0.3mm forecast at 15:00) are not a major concern structurally. However, high ambient humidity (~80%), overcast skies, and the light shower expected mid-afternoon today mean surfaces should be visually checked before committing — a dry window exists from late morning through early afternoon and again from late afternoon onward.

The rock has had roughly 24 hours of drying since the last light rain (1.3mm on May 6th), with today remaining dry and moderate southerly winds aiding evaporation on this south-facing venue. However, several days of light but persistent precipitation (May 1–6 totalling ~9.3mm) combined with high ambient humidity (~73–81%) mean some seepage areas and sheltered faces may still hold residual moisture.

The Cromlech Boulders have had a damp week with light but frequent precipitation, and today sees only trace amounts; the SW/W-facing rhyolite should be largely surface-dry by late morning but high humidity (77%) and overcast skies limit confidence. A good window exists midday through early evening, but climbers should check holds for residual dampness on arrival.

Light rain fell yesterday (2.5mm) and today has seen only a trace (0.3mm), but high humidity (avg 80% over the last week) and limited sunshine at 400m mean surface moisture may linger in sheltered spots. The exposed, wind-swept plateau and non-porous rhyolite favour quick drying, so a morning climbing window before the light afternoon drizzle looks plausible — but visual assessment on arrival is essential.