If you didn’t need a close city I would have suggested Gran Canaria.
HK is funny when it gets to late October. The layers go on for the locals. For me it will just be another layer over the next few days. Hopefully Philippines for CNY but no doubt the seasonal one or two cold snaps will bite me when I get back. I cannot do HK sub 10 degrees. I have no problem with the UK cold (admittedly North Essex so hardly Yorkshire Dales etc).