But cycling in the rain is also fun :-) Possibly more so when you are headed home rather than to work but that just might be the "big kid" in me speaking
We live in the UK, it rains every single month of the year...
My personal opinion is September and October are the best times to be cycling in London. Gentle sun, blue clear skied days....lovely stuff!
Despite reports saying this month has been the wettest on record, I haven't noticed it being bad.
We all complain about the nippy starts, but who doesn't secretly like those first 5 minutes on the bike wearing radiator-heated cycling gear... and after 5 minutes if you're cold - you're not cycling hard enough!