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Haimen, Guangdong Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Haimen, Guangdong?
Haimen, Guangdong gets 1664 mm of precipitation a year over about 121 rainy days. July is the warmest month (average high 32°C) and January the coldest (average low 12°C).
Humid subtropical climate
Haimen, Guangdong has hot summers and mild winters. Daytime highs range from about 19°C in January to 32°C in July. June is usually the wettest month. The most comfortable time to visit is typically January to April and November to December, when daytime highs sit near 22°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 12° | 19° |
| Spring | Mar–May | 18° | 25° |
| Summer | Jun–Aug | 26° | 32° |
| Autumn | Sep–Nov | 21° | 28° |
How much rain does Haimen get?
Haimen gets 1664 mm of precipitation in an average year, spread over about 121 days with measurable rain. That is more rainy days than 67% of China.
June is the wettest month, with 293 mm. October is the driest, with 41 mm. June has the most rainy days, about 17.
The longest dry spell in the last five years lasted 39 days, to November 28, 2023.
Haimen weather by month
Haimen weather in January
In January, Haimen averages a high of 19°C and a low of 12°C. It gets 43 mm of precipitation over about 6 rainy days. Estimated sunshine is 53% of daylight hours, derived from ERA5 cloud cover. The January record high is 29°C (2000) and the record low is 2°C (1986). January is one of the most comfortable months to visit.
Haimen weather in February
In February, Haimen averages a high of 19°C and a low of 12°C. It gets 53 mm of precipitation over about 9 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The February record high is 29°C (2009) and the record low is 2°C (1984). February is one of the most comfortable months to visit.
Haimen weather in March
In March, Haimen averages a high of 22°C and a low of 15°C. It gets 92 mm of precipitation over about 10 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The March record high is 32°C (2024) and the record low is 3°C (1986). March is one of the most comfortable months to visit.
Haimen weather in April
In April, Haimen averages a high of 25°C and a low of 19°C. It gets 157 mm of precipitation over about 12 rainy days. Estimated sunshine is 37% of daylight hours, derived from ERA5 cloud cover. The April record high is 35°C (2025) and the record low is 9°C (1996). April is one of the most comfortable months to visit.
Haimen weather in May
In May, Haimen averages a high of 28°C and a low of 22°C. It gets 208 mm of precipitation over about 14 rainy days. Estimated sunshine is 26% of daylight hours, derived from ERA5 cloud cover. The May record high is 38°C (2021) and the record low is 15°C (1984).
Haimen weather in June
In June, Haimen averages a high of 31°C and a low of 25°C. It gets 293 mm of precipitation over about 17 rainy days. Estimated sunshine is 12% of daylight hours, derived from ERA5 cloud cover. The June record high is 37°C (2000) and the record low is 18°C (1981).
Haimen weather in July
In July, Haimen averages a high of 32°C and a low of 26°C. It gets 235 mm of precipitation over about 14 rainy days. Estimated sunshine is 32% of daylight hours, derived from ERA5 cloud cover. The July record high is 39°C (2008) and the record low is 21°C (1985).
Haimen weather in August
In August, Haimen averages a high of 32°C and a low of 26°C. It gets 292 mm of precipitation over about 15 rainy days. Estimated sunshine is 26% of daylight hours, derived from ERA5 cloud cover. The August record high is 38°C (2012) and the record low is 22°C (1994).
Haimen weather in September
In September, Haimen averages a high of 31°C and a low of 24°C. It gets 150 mm of precipitation over about 10 rainy days. Estimated sunshine is 43% of daylight hours, derived from ERA5 cloud cover. The September record high is 38°C (2021) and the record low is 18°C (1971).
Haimen weather in October
In October, Haimen averages a high of 28°C and a low of 21°C. It gets 41 mm of precipitation over about 4 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The October record high is 37°C (2024) and the record low is 8°C (1978).
Haimen weather in November
In November, Haimen averages a high of 25°C and a low of 17°C. It gets 51 mm of precipitation over about 5 rainy days. Estimated sunshine is 52% of daylight hours, derived from ERA5 cloud cover. The November record high is 33°C (2023) and the record low is 4°C (1979). November is one of the most comfortable months to visit.
Haimen weather in December
In December, Haimen averages a high of 21°C and a low of 13°C. It gets 46 mm of precipitation over about 6 rainy days. Estimated sunshine is 49% of daylight hours, derived from ERA5 cloud cover. The December record high is 30°C (2023) and the record low is 1°C (1991). December is one of the most comfortable months to visit.
Sunshine, humidity and wind in Haimen
January is the sunniest month in Haimen, with estimated sunshine of 53% of daylight hours from ERA5 cloud cover. June is the cloudiest, at 12%. The annual cloud-cover estimate is 38% of daylight hours; it is not a measurement of sunshine duration. Haimen is cloudier than 69% of China.
Humidity peaks in June at 83% and is lowest in December at 67%.
Haimen has about 44 days a year above 32°C. Haimen is hotter than 64% of China.
Haimen weather records
These records cover SHANTOU during 1970–2025. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Haimen station is 39°C, on July 27, 2008. The coldest is 1°C, on December 29, 1991.
The wettest day in the available station history brought 396 mm of precipitation, on May 17, 2006.
35 all-time records have been set at the station since 1970.
The annual mean temperature has changed by +0.4°C per decade since 1970.
The best time to visit Haimen
The most comfortable time to visit is typically January to April and November to December, when daytime highs sit near 22°C.
Winter (December–February) is mild, with average highs around 20°C and lows near 12°C.
Spring (March–May) is warm, with average highs around 25°C and lows near 19°C.
Summer (June–August) is hot, with average highs around 32°C and lows near 26°C. It can feel humid.
Autumn (September–November) is hot, with average highs around 28°C and lows near 21°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 12° | 19° | 43 mm | 6 | 71% | 53% | 29° | 2° |
| February | 12° | 19° | 53 mm | 9 | 75% | 42% | 29° | 2° |
| March | 15° | 22° | 92 mm | 10 | 77% | 39% | 32° | 3° |
| April | 19° | 25° | 157 mm | 12 | 76% | 37% | 35° | 9° |
| May | 22° | 28° | 208 mm | 14 | 79% | 26% | 38° | 15° |
| June | 25° | 31° | 293 mm | 17 | 83% | 12% | 37° | 18° |
| July | 26° | 32° | 235 mm | 14 | 80% | 32% | 39° | 21° |
| August | 26° | 32° | 292 mm | 15 | 83% | 26% | 38° | 22° |
| September | 24° | 31° | 150 mm | 10 | 80% | 43% | 38° | 18° |
| October | 21° | 28° | 41 mm | 4 | 72% | 42% | 37° | 8° |
| November | 17° | 25° | 51 mm | 5 | 71% | 52% | 33° | 4° |
| December | 13° | 21° | 46 mm | 6 | 67% | 49% | 30° | 1° |
Station: SHANTOU, 24 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1970–2025; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Haimen climate questions
How much rain does Haimen get?
Haimen gets 1664 mm of precipitation in an average year, over about 121 rainy days.
What is the wettest month in Haimen?
June is the wettest month in Haimen, with 293 mm. October is the driest, with 41 mm.
How many rainy days does Haimen have a year?
Haimen has about 121 days with measurable rain in an average year. June has the most, about 17.
What is the hottest month in Haimen?
July is the warmest month in Haimen, with an average high of 32°C.
What is the coldest month in Haimen?
January is the coldest month in Haimen, with an average low of 12°C.
What is the record high temperature in Haimen?
Within the available 1970–2025 station history, the record high at the Haimen station is 39°C, set on July 27, 2008. The record low is 1°C, on December 29, 1991.
What is the sunniest month in Haimen?
January is the sunniest month in Haimen, with estimated sunshine of 53% of daylight hours from ERA5 cloud cover. June is the cloudiest.
What is the best time to visit Haimen?
The most comfortable time to visit is typically January to April and November to December, when daytime highs sit near 22°C.