September weather forecast
Hai Phong, Vietnam

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Weather in September

September experiences a drop in rainfall from the peak observed in August, signaling the onset of the dry season. The decline in rainfall is accompanied by a decrease in humidity. Notably, temperatures remain high, indicating the lingering effects of the summer heat. Despite receiving considerable sunshine, September sea temperatures decline to 29.3°C (84.7°F). As the wetness subsides and the weather begins to cool, September presents a pleasant period to visit Hai Phong.

Temperature

As Hai Phong transitions into September, the average high-temperature stands at a still hot 30.8°C (87.4°F), offering little variation from the preceding month. In September, Hai Phong encounters an average low-temperature of 24.2°C (75.6°F) during the night.

Heat index

For most parts of September, the heat index is computed to be an extremely hot 43°C (109.4°F). Precaution: Heat cramps along with heat exhaustion are possible. Heatstroke is a serious risk with continued exertion.
Heat index readings emphasize conditions of light breezes and shaded spots. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', offers an insight into how hot it feels when we factor in moisture content. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

In September, the average relative humidity is 87%.

Rainfall

In Hai Phong, in September, it is raining for 10.6 days, with typically 324mm (12.76") of accumulated precipitation. In Hai Phong, during the entire year, the rain falls for 104.3 days and collects up to 2209mm (86.97") of precipitation.

Sea temperature

In Hai Phong, in September, the average water temperature is 29.3°C (84.7°F).
Note: Surface water temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are considered superb and highly pleasant for water activities over extended periods.

Daylight

In September, the average length of the day is 12h and 16min.
On the first day of the month, sunrise is at 05:37 and sunset at 18:09. On the last day of September, sunrise is at 05:44 and sunset at 17:42 +07.

Sunshine

In September, the average sunshine is 6.3h.

UV index

In Hai Phong, the average daily maximum UV index in September is 11. A UV Index estimate of 11, and higher, represents an extreme threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum high UV index of 11 in September translates into the following recommendations:
Carry out every crucial safety measure. People with fair skin may sustain burns in fewer than 5 minutes. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. One must apply and reapply generously an SPF 30+ broad-spectrum sunscreen every two hours or after an outdoor workout or swim. Attention! UV radiation is ramped up when reflecting off sand and water surfaces.

Frequently asked questions

How hot is it in Hai Phong in September?

An average high-temperature, in September, in Hai Phong, is 30.8°C (87.4°F) and the average low-temperature is 24.2°C (75.6°F). In September, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is computed to be 43°C (109.4°F).

What is the average humidity in September?

In September, the average relative humidity is 87%.

How much does it rain in September?

In Hai Phong, in September, it is raining for 10.6 days, with typically 324mm (12.76") of accumulated precipitation.

What is the sea water temperature in September in Hai Phong?

In September, the average sea temperature is 29.3°C (84.7°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in September?

In September, the average day length is 12h and 16min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 05:37 and sunset at 18:09. On the last day of the month, sunrise is at 05:44 and sunset at 17:42 +07.

How long on average sun shines in September?

The average sunshine duration in September is 6.3h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 11. A UV Index reading of 11, and higher, represents an extreme health vulnerability from unprotected exposure to UV radiation.

Average temperature in September
Hai Phong, Vietnam

Average temperature in September - Hai Phong, Vietnam
  • Average high temperature in September: 30.8°C

The warmest month (with the highest average high temperature) is July (32.1°C).
The month with the lowest average high temperature is January (19.7°C).

  • Average low temperature in September: 24.2°C

The month with the highest average low temperature is July (25.9°C).
The coldest month (with the lowest average low temperature) is January (14.2°C).

Average humidity in September
Hai Phong, Vietnam

Average humidity in September - Hai Phong, Vietnam
  • Average humidity in September: 87%

The month with the highest relative humidity is April (91%).
The month with the lowest relative humidity is January (78%).

Average rainfall in September
Hai Phong, Vietnam

Average rainfall in September - Hai Phong, Vietnam
  • Average rainfall in September: 324.4mm

The wettest month (with the highest rainfall) is August (473mm).
The driest month (with the least rainfall) is January (37.1mm).

Average rainfall days in September
Hai Phong, Vietnam

Average rainfall days in September - Hai Phong, Vietnam
  • Average rainfall days in September: 10.6 days

The month with the highest number of rainy days is August (15.3 days).
The month with the least rainy days is December (2.6 days).

Average sea temperature in September
Hai Phong, Vietnam

Average sea temperature in September - Hai Phong, Vietnam
  • Average sea temperature in September: 29.3°C

The best month for swimming (with the highest average sea temperature) is July (30.5°C).
The coldest month (with the lowest average sea temperature) is January (19.6°C).

Average daylight in September /
Average sunshine in September
Hai Phong, Vietnam

Average daylight in September / Average sunshine in September - Hai Phong, Vietnam
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 13h and 24min).
The month with the shortest days is December (Average daylight: 10h and 54min).

  • Average sunshine in September: 6h and 2min

The month with the most sunshine is July (Average sunshine: 7h and 0min).
The month with the least sunshine is March (Average sunshine: 1h and 24min).

Average UV index in September
Hai Phong, Vietnam

Average UV index in September - Hai Phong, Vietnam
  • Average UV index in September: 11

The months with the highest UV index are March, April, May, June, July and August (UV index 12).
The month with the lowest UV index is December (UV index 7).

Hai Phong, Vietnam

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