Climate in the Red River Delta

Average daytime and nighttime temperatures

All climatic diagrams on this site result from the collected data from three measuring weather stations in Red River Delta.
All data correspond to the average monthly values of the last 20 years.

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The Red River Delta is one of the coldest regions in Vietnam with an average daily high temperature of only 28 degrees centigrade. High humidity and hot temperatures make the weather at times pleasant but also tropical humid. In 9 months the average temperatures are over 25 degrees. Pleasant water temperatures of up to 29 degrees even invite you to take a bath in the warm season. Because of the lower temperatures the best time for traveling is from December to March. Try to avoid the rainy season from July to September.
Overview: Climate in Vietnam
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Hours of sunshine per daySunshine hours per day in the Red River Delta
The number of hours of sunshine refers to the time when the sun is actually visible. That is, without any obstruction of visibility by clouds, fog or mountains. With 6 hours per day, June is the sunniest month in the region of Red River Delta. In March the sun shines the shortest.
Rainy days per monthRainy days per month in the Red River Delta
A rainy day is a day on which at least an amount of 0.1 mm precipitation (=0.1 liter) per square meter falls. This can be rain, snow, hail or even dew. So it does not have to rain the whole day. With 16 rainy days, August offers the most number of rainy days, and in December the least.
Precipitation in mm/dayPrecipitation in the Red River Delta
The amount of precipitation is measured in millimeters per square meter. Thus, at two mm/day, two liters of water fall on one square meter within 24 hours. With only 0.8 mm, the least rain falls in December. August, on the other hand, has the most rain.
Water temperatureWater temperatures in the Red River Delta
Water temperature depends not only on solar radiation within the same region, but also on ocean currents. For example, depending on the season, cold or warm water masses are moved from other areas. The warmest temperatures in the Red River Delta are in June, when the water is 29 °C.
Relative humidity in %Relative humidity in the Red River Delta
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture of the physically possible is actually contained in the air. At high humidity, the person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% gives as pleasant. With humidity averaging 88%, March is the most uncomfortable. In November, on the other hand, it is easier to endure.
Absolute humidity in g/m³Absolute humidity in the Red River Delta
In warm months, there is also a higher absolute humidity almost everywhere. At a temperature of 25°C, air can absorb up to 23 grams of water per cubic meter. At 20°C, it is only 17.3 grams. A relative humidity of 40% at 25°C thus corresponds to an absolute humidity of 9.2 grams of water. From a proportion of approx. 13.5 grams, humans perceive the air as muggy. This limit is reached in 10 months in the Red River Delta, although these are average values, and a month is rarely completely or not at all considered humid.
Humidex in °CHumidex in the Red River Delta
The "Humidex" (humidity index) is an index of well-being in warmer areas, calculated from the air temperature, relative humidity and dew point. The index corresponds approximately to the temperature felt. At high temperatures, the body transports heat away by sweating. At high humidity the ambient air can only absorb a small amount of sweat and thus one feels uncomfortable. An index of 20-29 is considered comfortable. Up to 39, people perceive the air as slightly uncomfortable, and above 40, as very uncomfortable. Values above 45 are dangerous in the long run and often lead to heat stroke.
Map of Red River Delta

Most important cities in the region »Red River Delta«

As the capital region, it is arguably the most important part of Vietnam. Alone 2 major cities with over 600,000 inhabitants are located here. The region has a west-east extension of about 160 km and over 120 km from north to south.

It consists of the ten provinces Bac Ninh, Ha Noi, Hai Duong, Hai Phong, Hung Yen, Hà Nam, Nam Dinh, Ninh Bình, Thái Bình and Vinh Phuc.

CityPopulationGeo position
Hanoi4,678,19821° 1' 28"N105° 50' 28"E
Haiphong602,69520° 51' 53"N106° 41' 0"E
Thanh Pho Nam Dinh193,49920° 26' 2"N106° 10' 38"E
Thanh Pho Hai Duong58,03020° 56' 28"N106° 19' 59"E
Thanh Pho Thai Binh53,07120° 26' 60"N106° 20' 24"E
Ha Dong50,87720° 58' 17"N105° 46' 44"E
Bac Ninh43,56421° 11' 10"N106° 4' 35"E
Son Tay40,63621° 8' 26"N105° 30' 25"E
Hung Yen40,27320° 38' 47"N106° 3' 4"E
Thanh Pho Ninh Binh36,86420° 15' 29"N105° 58' 47"E
Thanh Pho Phu Ly31,80120° 32' 43"N105° 54' 44"E
Cát Bà30,00020° 43' 40"N107° 2' 53"E
Vinh Yen17,87621° 18' 32"N105° 36' 18"E

Data basis: German Weather Service, individual values averaged and supplemented by own elements. Data on cities and inhabitants:, United Nations Statistics Division and own research.
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