Too cold for out of doors unless you plan on using heat. At 3 weeks they need around 75-80*
On warm day with no wind they can go out for adventures with you but I would keep an eye on them so you can bring them in if you notice them laying down acting chilled.
On warm day with no wind they can go out for adventures with you but I would keep an eye on them so you can bring them in if you notice them laying down acting chilled.