Weather wise, October, November and most of December are the best months to visit Hong Kong; the skies are clear and the sun shines. The June to August heat/rain combo might push your endurance but there’s a lot of sunshine and, after all, it’s summer. Hotels tend to offer substantial discounts outside the high seasons of March-April and October-November. Travel can be difficult during Chinese New Year in late January/early February.
Many prefer to visit Hong Kong during November and December when there are pleasant breezes, plenty of sunshine and comfortable temperatures. January and February are OK times to visit, but the temperature can drop to below 10°C (50°F).