Weather in Hong Kong

Rain is wet season runs from April to September, inside an annual total of 1400 mm. The wettest month is June at 282 mm; the driest is December at 25 mm.

Hong Kong is in Hong Kong at 22.3°N. The 2001–2020 NASA POWER daily record describes a mild oceanic climate. July is the warmest month (average 28.7°C, high 30.4°C) and January is the coolest (average 16.2°C, low 12.7°C). On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are February, November, and December.

Best months to visit Hong Kong

The three months with the highest comfort score are February, November, and December: February (18.0°C average, 29 mm, 78% humidity); November (21.9°C average, 30 mm, 75% humidity); December (17.4°C average, 25 mm, 71% humidity). They fall in calendar order. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you want the wet season itself — fewer crowds, greener landscape, heavier rain — aim at April–September instead of the score.

How warm Hong Kong gets

Hong Kong has a 12.5°C gap between its coolest monthly average (16.2°C in January) and its warmest (28.7°C in July). That is a northern-hemisphere pattern.

Mean high across all twelve months is 26.2°C and mean low is 20.9°C. These are 20-year grid averages, so a city station can read a few degrees warmer or cooler.

When Hong Kong gets wet

The wet season in Hong Kong starts in April and ends in September (April, May, June, July, August, and September). June is the core of it at 282 mm. December is the other extreme, with 25 mm.

A rainy day here is a day with at least 1 mm in the NASA POWER series. June averages 22 such days; December averages 4.

The calendar in Hong Kong

The year bottoms out in January. Plan for 12.7°C at night and 19.8°C in the afternoon. May stands apart from the months beside it: 28.7°C / 24.3°C and 210 mm. June is the wettest month — 282 mm and 22 rainy days, with 86% humidity. July is the warmest month. Afternoon highs average 30.4°C and nights settle near 27.0°C, with 185 mm of rain.

September closes the wet season: 161 mm over 16 rainy days, then the calendar dries. October stands apart from the months beside it: 28.2°C / 22.4°C and 49 mm. November brings 30 mm and 5 rainy days; temperatures run from 18.5°C to 25.3°C. December is the driest month, averaging only 25 mm across 4 rainy days. Highs sit near 21.1°C.

How Hong Kong compares inside Hong Kong

Hong Kong is the only Hong Kong city in this dataset, so the figures on this page are the national sample we publish. They still come from the same NASA POWER daily series (2001–2020) used everywhere else on the site.