Autoland systems are basically designed to be used during low visibility caused by phenomena like fog, NOT for tropical downpours with or without windy conditions. Foggy conditions hardly ever go together with extreme wind conditions. (excluding Scotland... )
Autopilots most likely have insufficient authority to cope with a large and sudden wind shear or down draft because of entering a shower on short final or flare heights.
The B777 can autoland with a 40kt crosswind. In BA it was allowable to do that in Cat I conditions or better. It can also autoland one engine out.