Like others, a bit of a tailwind, with gusts. The trouble with the wet'n'windy days, is that you can't really take advantage of the speed that the tailwind gives you, because the wet (and en-chutnied) roads are too slippery to risk having to try and stop fast. With London traffic, I'll reckon on a couple of hard stops every journey, and with wet rim brakes that just doesn't work very well. I must get the commuter built up with it's disc brakes.
There seemed to be an outbreak of indicator failure in South London today, as well. Apparently wet weather makes the use of left turning indicators optional after overtaking cyclists.