chance of rain is a possibility, however early autumn is a safe choice, and if need be, the ceremony can always be moved indoors into the house.
the vines and trees are likely to be bare in the first few weeks of spring, with still very cold nights and cool days, with a lot of possibility of rain.
by the middle of spring, the trees and vines should be budding and showing a glimpse of life, with some days of rain, but many days of sunshine also.
at the end of spring in november, the vines and trees are likely to be full of leaves and life, and a few scattered days of 