In article ,
Jon O'Rourke writes:
2 Days early.. Heathrow now 30°C

EGLL 291250Z 18010KT 130V220 CAVOK 30/09 Q1013 NOSIG

The forecast I heard on Radio 4 this morning said it would be hot and
humid, but a dewpoint of 9C doesn't look like high humidity to me.
--
John Hall
"Acting is merely the art of keeping a large group of people
from coughing."
Sir Ralph Richardson (1902-83)