Haikou Weather in September
Haikou in September sees very high temperatures, with highs around 31°C (88°F) and overnight lows of 26°C (79°F). Rainfall is at its peak this month, around 238 mm (9.4 in) on average, so waterproofs are essential.
Rainfall in Haikou in September
Haikou is in the rainy season in September, with rain on around 17 days and an average of 238 mm (9.4 in). Rainfall this month is frequent and tends to be fairly heavy when it does fall. Packing waterproofs is a good idea.
Temperature in Haikou in September
In September, Haikou sees very high temperatures, with highs of 31°C (88°F). Nights drop to around 26°C (79°F). If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. With lows of 26°C (79°F), it stays warm throughout the night. A cold shower before going to sleep is one of the easiest ways to cool down before bed.
Sunshine in Haikou in September
Expect sunny days throughout the month, with an estimated 192 hours of sunshine. Despite being the rainy season, it could still be a nice time to visit. Rain often arrives later in the day, keeping most of the days sunny.
Wind Speed in Haikou 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.September in Haikou 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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit China, check out our Haikou's climate page.
Haikou Temperature in September
Min Temperature
26°C (79°F)
Max Temperature
31°C (88°F)
Chance of Rain
58%
Precipitation
238 mm (9.4 in)
Rainy days
17 days
Humidity
81%
Windspeed
2 m/s (4 knots)
Sunshine
192 hours
Percentage Sunshine
54%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Haikou typically stay consistent throughout September, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 25°C (77°F).
Average temperatures in September
Historical weather for Haikou in September
Browse day-by-day weather records for Haikou spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Haikou historical weather extremes in September
Based on 49 years of weather observations in Haikou between 1976 and 2025, these are the recorded extremes.
- On September 20, 1990, temperatures climbed to 38°C (100°F), marking the warmest September day on record.
- The lowest daytime temperature in September was 22°C (72°F), recorded on September 28, 1997.
- The lowest overnight temperature recorded in September was 20°C (68°F) (September 23, 2014).
Best Places in China in September
Find out more about the weather in China and which places have the best travel conditions in this month. See all of China in September →
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tolerable
unpleasant
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What to Wear in Haikou in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Haikou in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit China, check out our Haikou's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Haikou climate overview or explore weather in China.
