Weather in Hainan for September 2026
Until now, September 2026 in Hainan has been significantly cooler than historical averages by 2 °C, with average temperature of 27.7 °C.
Expect cooler weather in the next days in Hainan with the forecast suggesting a temperature of 26.6 °C, lower than the historical average.
In general, the average temperature in Hainan at the beginning of September is 29.7 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 29.4 °C by the end of September.
Hainan experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 406.8 mm.
Is September a good time to visit Hainan? check out the best time to travel to Hainan page.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
Hainan Weather September
What’s the Weather Like in Hainan This September?
Temperatures trend during September in Hainan
September weather in Hainan day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 29° /22° | 22.2 mm | 5 | |
| 2 Sept. |  Moderate or heavy rain with thunder | 30° /23° | 8.1 mm | 8 | |
| 3 Sept. | Light rain shower | 31° /23° | 3.7 mm | 9 | |
| 4 Sept. | Patchy rain possible | 31° /23° | 3.2 mm | 8 | |
| 5 Sept. | Light rain shower | 30° /23° | 9.1 mm | 7 | |
| 6 Sept. |  Patchy light rain with thunder | 29° /23° | 20.1 mm | 6 | |
| 7 Sept. |  Moderate or heavy rain shower | 28° /23° | 63.8 mm | 5 | |
| 8 Sept. | Patchy light rain with thunder | 30° /23° | 8.1 mm | 6 | |
| 9 Sept. | Moderate or heavy rain shower | 31° /23° | 15.8 mm | 6 | |
| 10 Sept. | Light rain shower | 28° /22° | 8.5 mm | 5 | |
| 11 Sept. |  Patchy light drizzle | 27° /22° | 8.7 mm | 5 | |
| 12 Sept. | Light rain shower | 24° /21° | 20.4 mm | 2.7 | |
| 13 Sept. | Light rain shower | 23° /22° | 48 mm | 1.3 | |
| 14 Sept. | Light rain shower | 23° /21° | 98.4 mm | 1.2 | |
| 15 Sept. | Light rain shower | 27° /22° | 6.1 mm | 6 | |
| 16 Sept. |  Mist | 27° /22° | 3.3 mm | 6 | |
| 17 Sept. | Light rain shower | 27° /22° | 13.1 mm | 7 | |
| 18 Sept. | Fog | 26° /23° | 6.2 mm | 6 | |
| 19 Sept. | Light rain shower | 25° /22° | 6.1 mm | 6 | |
| 20 Sept. | Mist | 27° /23° | 0.6 mm | 7 | |
| 21 Sept. |  Sunny | 29° /23° | 0 mm | 7 | |
| 22 Sept. | Sunny | 29° /24° | 7.5 mm | 7 | |
| 23 Sept. | Mist | 28° /24° | 19.5 mm | 6 | |
| 24 Sept. | Mist | 28° /23° | 6 mm | 7 | |
| 25 Sept. | Mist | 30° /22° | 1.5 mm | 7 | |
| 26 Sept. | Light rain shower | 29° /23° | 11.9 mm | 7 | |
| 27 Sept. | Light rain shower | 29° /23° | 5.8 mm | 7 | |
| 28 Sept. | Patchy rain possible | 29° /23° | 21 mm | 7 | |
| 29 Sept. | Light rain shower | 30° /24° | 2.8 mm | 7 | |
| 30 Sept. | Patchy light drizzle | 31° /23° | 3.3 mm | 7 | |
| Next | |||||
Hainan weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Patchy rain possible | Patchy rain possible | Patchy rain possible |
| Temperatures | 32°/24° | 30°/23° | 27°/21° |
| Rainfall | 209 mm | 407 mm | 327 mm |
| Wind | 14.2 km/h | 15.4 km/h | 17.9 km/h |
| Humidity | 79% | 87% | 86% |
| Rainy days | 29 days | 30 days | 27 days |
| Dry days | 2 days | 0 days | 4 days |
Planning a trip to Hainan? Discover the best time to visit
Hainan in September - FAQ
What are the expected maximum and minimum temperatures in Hainan during September?
How much rainfall should be expected in Hainan during September?
What are the typical wind conditions in Hainan during September?
September rainfall patterns in Hainan
UV exposure in Hainan during September
What to pack to Hainan in September?
Warm & sunny · highs around 30 °C, frequent showers
As you prepare for your trip to Hainan in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Hainan, during September, is comfortable and enjoyable, regardless of the weather conditions.
🧥 Clothing
👟 Footwear
🎒 Accessories
🧴 Personal Items
Quick links
Where is Hainan?Get accurate weather forecasts for Hainan, located at latitude 19.2 and longitude 109.7. Stay updated with localized weather information tailored for Hainan.