Well London is looking the only 'good bet' (18C sunny but breezy) guys (although Bristol has an outside chance too) as Southampton this evening has 14C and gale force winds
and Brighton (my fave ride that was looking brilliant with loads of nude running etc. and a student nude feeder ride from the Uni) looks a bit of a loss. The forecast is mixed, but expect 16C and possible rain, but at least no wind.
I just hope the Solstice ride has better weather, last year it and Brighton suffered the same wet and cold type of day.