The viewing of the total eclipse of August 11th as a large drawback, as far as Cornwall is concerned, it is happening in England.
The British Isles are not renown for their sun-kissed shores and scorching deserts. They are known, far back into antiquity, as lands of fog, mist and rain. Which does not augur well for viewing a sky-borne phenomenon. In fact the percentage chance of cloud cover are around 60%.
Fortunately, this is Cornwall, which is blessed with perhaps, on average, the best weather in the country and there is a greater chance here than anywhere else in the UK for actually getting clear skies. Not least because the county’s position, surrounded by water on three sides, the weather in Cornwall can be very quickly changeable.
Although there is some chance of storms moving up from France and the Bay of Biscay, this only really happens during the night, clearing by morning, and August tends to be time for the north eastern movement of the Azores anti-cyclone, bringing fine weather to Britain, with Cornwall first in line.
The greatest danger is perhaps the more local, sea affected weather systems, which may bring sea fog up over coastal regions, or mean think cloud inland, as sea breezes meet over the central highlands of the county.