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1.
That temperature slightly below body temperature.
The weather was so hot, so I went in for a cold shower. Unfortunately, that was too cold, so I had a lukecool one instead.
by ForsakenDAemon December 27, 2007
 
2.
only slightly cold, flip-side of lukewarm
1.) Damn refridgerator is not working, these beers are only lukecool.
2.) The A/C system must need some freon, it is only lukecool in here.
3.) The new marketing campaign had a lukecool reception from the public.
by Rumndietcoke May 17, 2013