The wheelchair race starts just before 9am then the Elite and the mass marathon start is at 10am.
The day could start off cloudy but be warned the sun will come out and you can still get burnt through the clouds anyway. Humidity levels won't be high, this is clean air from the west so no pollution issues like those from a week or so ago. Temperatures will rise to 17C in the afternoon, so warm if you are plodding along in a rhino suit.
A light westerly wind is forecast so not much of a concern but most of the route is heading west, although with squiggly bit around Docklands after half way. So the breeze will be in your face for first half and last fifth.
Good luck to all the runners and enjoy the race.