It's those moist westerlies when the forecast is (as todays MetO
forecast see chart http://www.metoffice.gov.uk/weather/...t_weather.html)
cloudy on exposed west facing coasts, sunny spells in shelter.

In fact out at Sennen, where I've just spent the morning, it's sunny
on the beach. The low cloud forms as the air rises up the cliff, so a
mile inland it's quite dull. This is so often the case. The moors are
misty In Penzance its low base small cumulus & sunny spells. A quick
look at XCWeather reveals Scilly is reporting no cloud (or it was at
11:00BST).

Currently (12:30) around 17C in Penzance, so still quite warm.

Graham
Penzance