Hong Kong Weather in September

During September, Hong Kong experiences very high daytime temperatures of 31°C (88°F) and cooler nights around 26°C (79°F). September sits within the rainy season, so expect regular and often heavy rainfall.

Rainfall in Hong Kong in September

As part of the rainy season, Hong Kong sees around 14 days of rain in September, with an average of 222 mm (8.7 in). With high rainfall totals spread across the month, individual showers can be very heavy. Waterproof gear is strongly recommended.

Temperature in Hong Kong in September

Hong Kong in September gets highs of 31°C (88°F) during the day and drops to 26°C (79°F) at night. The hottest part of the day is usually in the afternoon, so lighter clothing can help you stay comfortable. With overnight lows of 26°C (79°F), nights stay very warm. Air conditioning makes a real difference if you're sensitive to heat. A cold shower before bed can also help you get to sleep more comfortably.

Sunshine in Hong Kong in September

You can expect a moderate amount of sunlight, with approximately 175 hours. Even though this month is part of the wet season, you can still see the sun occasionally.

Wind Speed in Hong Kong in September

September sees wind speeds averaging 2 m/s (4 knots). You'll typically experience pleasant light breezes that move leaves slightly and feel refreshing. As an average, expect variation from very calm days to periods with more apparent air movement.

Average water temperature in September

With water at 28°C (82°F), you can expect warm, pleasant conditions for any water activity. There's no adjustment period — it feels comfortable straight away.

September in Hong Kong has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.

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For a detailed overview over the year and the best time to visit Hong Kong, check out our Hong Kong's climate page.

Hong Kong Temperature in September

Min Temperature 26°C (79°F)  

Max Temperature 31°C (88°F)  

Water Temperature 28°C (82°F)  

Chance of Rain 48%  

Precipitation 222 mm (8.7 in)  

Rainy days 14 days  

Humidity 78%  

Windspeed 2 m/s (4 knots)  

Sunshine 175 hours  

Percentage Sunshine 47%  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Hong Kong typically stay consistent throughout September, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 26°C (79°F).

Average temperatures in September

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Historical weather for Hong Kong in September

Browse day-by-day weather records for Hong Kong spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Hong Kong historical weather extremes in September

Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Hong Kong.

• The warmest day in September was on September 17, 2024, with a maximum of 37°C (99°F).
• The lowest daytime temperature in September was 23°C (73°F), recorded on September 12, 2006.
• The coldest night in September in Hong Kong was on September 28, 1997, with a minimum of 18°C (64°F).

What to Wear in Hong Kong in September

Warm but pleasant conditions in Hong Kong in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. The water temperature sits at about 28°C (82°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Hong Kong in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Cycling

7/10

Walking

7/10

Camping

7/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Hong Kong, check out our Hong Kong's climate page.

More climate data for Hong Kong

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Hong Kong climate overview or explore weather in Hong Kong.