Depends on the weather, could be a tad chilly on the tops. Where are you thinking of camping? There's a flatish spot by the Falls of Dee that's often windless when it's blowing a hoolie all around it. Most likely it will be blowing a hoolie mid October but you never know.
As owenM says, it's often grim, wet and windy or it could be lovely! Have bivvied on the tops in November in fine weather before. Apologies for atating the obvious but a plan b would be a good idea at any time of the year.
Not too late if the weather's good! You can always drop down to Loch nan Stuirteag for a slightly more sheltered location, though you do lose a bit of height. Alternatively do the high level traverse in a day and camp at Corrour bothy; then you've got the fall-back of the bothy if the weather's really unpleasant.
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