Haimen climate
Haimen (Guangdong, China) has a humid subtropical climate (Köppen Cfa). The average temperature over the year is 23 °C73 °F, and about 1,272 mm50 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Haimen climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 1763 | 1559 | 1661 | 481.9 |
| Feb | 1864 | 1660 | 1762 | 381.5 |
| Mar | 2068 | 1864 | 1966 | 702.8 |
| Apr | 2373 | 2170 | 2271 | 903.5 |
| May | 2678 | 2476 | 2577 | 1576.2 |
| Jun | 2882 | 2780 | 2781 | 2289.0 |
| Jul | 2984 | 2882 | 2883 | 1656.5 |
| Aug | 2984 | 2882 | 2883 | 2108.3 |
| Sep | 2883 | 2780 | 2882 | 1275.0 |
| Oct | 2678 | 2475 | 2577 | 401.6 |
| Nov | 2373 | 2169 | 2271 | 542.1 |
| Dec | 1966 | 1762 | 1864 | 461.8 |
| Year | 2984 | 1559 | 2373 | 1,27250 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 81% | 61% | 3.2 | 10:51 |
| Feb | 84% | 71% | 3.2 | 11:21 |
| Mar | 85% | 74% | 3.5 | 11:58 |
| Apr | 86% | 76% | 3.9 | 12:40 |
| May | 89% | 79% | 4.3 | 13:15 |
| Jun | 89% | 79% | 4.5 | 13:33 |
| Jul | 87% | 69% | 5.4 | 13:26 |
| Aug | 87% | 67% | 5.1 | 12:56 |
| Sep | 83% | 63% | 4.8 | 12:15 |
| Oct | 79% | 50% | 4.4 | 11:34 |
| Nov | 81% | 56% | 3.6 | 10:59 |
| Dec | 79% | 54% | 3.2 | 10:43 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Haimen is like
The warmest month is July, with an average high of 29 °C84 °F and a low of 28 °C82 °F. The coldest is January, when highs average 17 °C63 °F and lows 15 °C59 °F. There is a clear seasonal cycle, with 12.2 °C21.9 °F between the average temperature of the warmest and the coolest month.
It is wet, with about 1,272 mm50 in of precipitation per year. The wettest three-month stretch is June–August, which brings 47% of the annual total. The wettest month is June (228 mm9.0 in), the driest is February (38 mm1.5 in).
Relative humidity ranges from 79% in December to 89% in June. The clearest skies (lowest average cloud amount, 50%) are typical of October. Average wind speed near the ground ranges from 13 km/h (8 mph) in August to 24 km/h (15 mph) in December. Daylight lasts from about 10.7 hours in December to 13.6 hours in June.
Best time to visit Haimen
Based on these averages, the most comfortable months for sightseeing and outdoor activities are March and April and October–December: average highs of 19 °C66 °F to 26 °C78 °F with 40 mm1.6 in to 90 mm3.5 in of precipitation per month.
The most challenging month is June, which is very wet (228 mm9.0 in) and humid (89% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Haimen
- Wetter months (May–September) — highs 2678 to 29 °C84 °F, lows 2476 to 28 °C82 °F, about 177 mm7.0 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
- Drier months (October–April) — highs 1763 to 26 °C78 °F, lows 1559 to 24 °C75 °F, about 55 mm2.2 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket.
How Haimen compares
Compared with Shantou, about 19 km to the north, Haimen has practically the same average temperature and receives 14% less precipitation (1,272 mm50 in vs 1,478 mm58 in). The difference is largest in December (1 °C1.8 °F warmer).
Of the 547 places in China covered by World Climates, Haimen is the 34th warmest by annual mean temperature and the 168th wettest by annual precipitation. See all of them on the China climate page.
Places in other countries with the most similar temperature and rainfall pattern: Tampa (United States, Cfa), Tin Shui Wai (Hong Kong, Cwa) and Cape Coral (United States, Cfa).
Nearby places
- Shantou 19 km · 23 °C73 °F · 1,478 mm58 in
- Huicheng 37 km · 23 °C73 °F · 1,502 mm59 in
- Puning 47 km · 23 °C73 °F · 1,633 mm64 in
- Jiazi 65 km · 23 °C73 °F · 1,502 mm59 in
- Hepo 84 km · 22 °C72 °F · 1,738 mm68 in
- Shuizhai 119 km · 22 °C71 °F · 1,641 mm65 in
- Meizhou 132 km · 22 °C72 °F · 1,582 mm62 in
- Shanwei 137 km · 23 °C73 °F · 1,722 mm68 in
Frequently asked questions
What is the warmest month in Haimen?
July is the warmest month in Haimen, with an average high of 29 °C (84 °F) and an average low of 28 °C (82 °F).
What is the coldest month in Haimen?
January is the coldest month, with an average high of 17 °C (63 °F) and an average low of 15 °C (59 °F).
When does it rain the most in Haimen?
June is the wettest month with about 228 mm (9.0 in) of precipitation; February is the driest with about 38 mm (1.5 in).
What is the best time to visit Haimen?
Judging by long-term averages, the most comfortable months are March and April and October–December.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.