Hong Kong · Records from 2006 to 2025. Not a forecast.
Mean high29°Hottest day 36.5° (2023)
Mean low25°Coldest night 16.3° (2022)
Rain days12 days5-22 by year
Rainfall318mmDaylight 13.0 → 13.4 h
Hong Kong's 12 months iBest: March, November and December
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Trip typesBeach Finewarm sea and frequent rainSightseeing on foot Finefrequent rain and muggy
Humidity84%28 muggy days
Clear days2 days19 overcast days
Mean wind11 km/hRarely windy
Sea temperature26.5°25.3-28.6° by year (last 6)
Sunrise / sunset (15th)05:43 / 18:55Daylight 13.0 → 13.4 h
Hong Kong in May
The month the wet season begins. Typhoons can arrive as early as May. Around the eighth day of the fourth lunar month the Cheung Chau Bun Festival is held, usually late April to early May.
May brought serious heat to Hong Kong, 29°C on a typical afternoon and 25°C overnight. Early mornings were the best time to be outside. The gap between day and night was just 4°C, so it felt much the same around the clock. About 12 days a month saw rain, enough that a wet-weather plan was worth having. It varied a lot from year to year. May 2018 had 5 rain days; 2015 had 22.
Highs passed 30°C on 10 days on average. Not every year was typical: 2021 ran 2.6°C warmer than the mean, with highs of 31.5°C. Wet days did not mess around: about 26 mm each, the kind of rain that drives you into a doorway.
Typhoons i
1 of the last 20 years had a tropical storm pass within 300 km this month.
Over the past 20 years May averaged 12 rain days (1 mm or more) out of 31. Individual years ran from 5 in the driest to 22 in the wettest.
What should I wear in Hong Kong in May?
Days averaged 29°C and nights 25°C. Pack an umbrella, sandals that can get wet, T-shirts, sunscreen plus a hat, a swimsuit, and insect repellent.
Can you swim in Hong Kong in May?
Sea surface temperature averaged 26.5°C in May, comfortable for swimming. Year to year it ranged 25.3-28.6°C. Check local flags for waves and jellyfish on the day.
Is May a good time to visit Hong Kong?
On warmth and rain days alone, Hong Kong's easiest months were March, November and December. May ranked 8 of 12.
Is Hong Kong humid in May?
Mean relative humidity was 84%, with about 28 muggy days (dew point of 20°C or more) in the month.