I do think its too late to put them outside now.
usually you'd do it in the summer where inside is the same temperature as outside. the concern now is its already in some areas getting quite cold outside of a night, and even of a day, and they haven't had chance to grow their winter coats.
its not suggested to move bunnies in or out when there is a 7c difference between the house and the outside. for me tonight its set to get down to 4c, its 22 in the house give or take, that's far too cold for them to suddenly go out to to live in.
with the best will in the world you're not going to be able to get the same temperature unless you're using a heater, and you'd have to use it throughout the winter to keep them at the same temperature until summer.
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