September weather forecast
Busan, South Korea

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The Haedong Yonggungsa Temple set on a beautiful hillside in Busan, South Korea
The Haedong Yonggungsa Temple set on a beautiful hillside in Busan, South Korea

Weather in September

September brings a gradual cooling trend to Busan, with temperatures dropping from August highs to a comfortable 24.5°C (76.1°F). Despite this decline, the city experiences the same amount of rainfall as in August, about 69mm (2.72"). As the onset of the fall season, the city is characterized by vibrant foliage colours. Wind speeds remain moderate, contributing to the pleasant conditions. Relative humidity begins to decrease, signalling the approaching drier months.

Temperature

In September, the average high-temperature in Busan marginally decreases from a moderately hot 27.9°C (82.2°F) in August to a still warm 24.5°C (76.1°F). During September's nights, Busan notes a minor temperature decline, reaching an average of 20.9°C (69.6°F).

Humidity

In Busan, the average relative humidity in September is 76%.

Rainfall

In September, the rain falls for 9.1 days. Throughout September, 69mm (2.72") of precipitation is accumulated. In Busan, during the entire year, the rain falls for 98 days and collects up to 496mm (19.53") of precipitation.

Snowfall

In Busan, snow does not fall in January through October and December.

Sea temperature

In Busan, the average seawater temperature in September is 24.7°C (76.5°F).
Note: The allure of a swim in 24.7°C (76.5°F) waters can be influenced by your feelings towards the cold, today's sunshine, the wind's touch, and the ambient warmth. To put it in perspective, Olympic standards demand water temperatures of 25°C (77°F) to 28°C (82.4°F).

Daylight

In Busan, South Korea, the average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 05:56 and sunset at 18:50. On the last day of September, sunrise is at 06:17 and sunset at 18:09 KST.

Sunshine

The average sunshine in September is 7.7h.

UV index

In Busan, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: The UV index of 6 during September leads to these advisories:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Be vigilant! The Sun's UV rays get a boost from sand and water reflections.
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Frequently asked questions

What is the usual temperature for Busan in September?

The average high-temperature and low-temperature in Busan during September are 24.5°C (76.1°F) and 20.9°C (69.6°F) respectively. In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 32°C (89.6°F).

What is the average humidity in September in Busan?

In September, the average relative humidity is 76%.

How many days does it rain in September in Busan?

In Busan, South Korea, in September, it is raining for 9.1 days, with typically 69mm (2.72") of accumulated precipitation.

When it does not snow in Busan?

In Busan, snow does not fall in January through October and December.

What is the sea temperature in September in Busan?

In September, the average sea temperature in Busan is 24.7°C (76.5°F). For individuals prone to feeling cold, swimming in 23°C (73.4°F) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 24.7°C (76.5°F).

What is the average length of the day in September in Busan?

The average day length in September in Busan is 12h and 25min.

When is the sunrise / sunset in September in Busan?

In September, on the first day of the month, sunrise is at 05:56 and sunset at 18:50. On the last day of the month, sunrise is at 06:17 and sunset at 18:09 KST.

How long on average sun shines in September in Busan?

In September, the average sunshine duration in Busan is 7.7h.

What is the UV index reading in September in Busan?

The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in September
Busan, South Korea

Average temperature in September - Busan, South Korea
  • Average high temperature in September: 24.5°C

The warmest month (with the highest average high temperature) is August (27.9°C).
The month with the lowest average high temperature is January (6.1°C).

  • Average low temperature in September: 20.9°C

The month with the highest average low temperature is August (24.7°C).
The coldest month (with the lowest average low temperature) is January (1.2°C).

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Average pressure in September
Busan, South Korea

Average pressure in September - Busan, South Korea
  • Average pressure in September: 1013.1mbar

The month with the highest atmospheric pressure is January (1023.3mbar).
The month with the lowest atmospheric pressure is July (1007.6mbar).

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Average wind speed in September
Busan, South Korea

Average wind speed in September - Busan, South Korea
  • Average wind speed in September: 17.7km/h

The windiest month (with the highest average wind speed) is December (19.3km/h).
The calmest month (with the lowest average wind speed) is June (13.6km/h).

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Average humidity in September
Busan, South Korea

Average humidity in September - Busan, South Korea
  • Average humidity in September: 76%

The month with the highest relative humidity is July (87%).
The months with the lowest relative humidity are January and February (60%).

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Average rainfall in September
Busan, South Korea

Average rainfall in September - Busan, South Korea
  • Average rainfall in September: 69mm

The wettest month (with the highest rainfall) is July (97mm).
The driest month (with the least rainfall) is December (12mm).

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Average rainfall days in September
Busan, South Korea

Average rainfall days in September - Busan, South Korea
  • Average rainfall days in September: 9.1 days

The month with the highest number of rainy days is August (14.1 days).
The month with the least rainy days is January (4.6 days).

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Average snowfall in September
Busan, South Korea

Average snowfall in September - Busan, South Korea
  • Average snowfall in September: 0mm

The month with the highest snowfall is November (1mm).
The months with the least snowfall are January, February, March, April, May, June, July, August, September, October and December (0mm).

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Average snowfall days in September
Busan, South Korea

Average snowfall days in September - Busan, South Korea
  • Average snowfall days in September: 0 days

The months with the highest number of snowfall days are January and February (0.7 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average sea temperature in September
Busan, South Korea

Average sea temperature in September - Busan, South Korea
  • Average sea temperature in September: 24.7°C

The best month for swimming (with the highest average sea temperature) is August (26.3°C).
The coldest month (with the lowest average sea temperature) is March (13.3°C).

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Average daylight in September /
Average sunshine in September
Busan, South Korea

Average daylight in September / Average sunshine in September - Busan, South Korea
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in September: 7h and 4min

The month with the most sunshine is August (Average sunshine: 10h and 0min).
The months with the least sunshine are January and November (Average sunshine: 6h and 18min).

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Average sunshine days in September
Busan, South Korea

Average sunshine days in September - Busan, South Korea
  • Average sunshine days in September: 19.1 days

The month with the most sunshine days is January (25.3 days).
The month with the least sunshine days is August (14.8 days).

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Average UV index in September
Busan, South Korea

Average UV index in September - Busan, South Korea
  • Average UV index in September: 6

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).

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Average cloud cover in September
Busan, South Korea

Average cloud cover in September - Busan, South Korea
  • Average cloud cover in September: 39

The month with the most cloud cover is July (Cloud cover 45).
The month with the least cloud cover is December (Cloud cover 25).

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Average visibility in September
Busan, South Korea

Average visibility in September - Busan, South Korea
  • Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (10km).
The month with the lowest visibility is July (9km).

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Busan, South Korea

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