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Climate — Haikou: monthly averages
| Month | Day (max) | Night (min) | Monthly precipitation |
|---|---|---|---|
| January | 31°C | 7°C | 30 mm |
| February | 33°C | 8°C | 23 mm |
| March | 35°C | 10°C | 42 mm |
| April | 37°C | 17°C | 77 mm |
| May | 38°C | 21°C | 171 mm |
| June | 36°C | 24°C | 197 mm |
| July | 36°C | 25°C | 253 mm |
| August | 34°C | 25°C | 324 mm |
| September | 33°C | 22°C | 276 mm |
| October | 31°C | 18°C | 268 mm |
| November | 30°C | 11°C | 75 mm |
| December | 29°C | 9°C | 44 mm |
Long-term model averages for an area of about 50 km — not a forecast; mountains are often cooler. Source: NASA POWER Project (CC BY 4.0) (2001–2025)