Weather in September
Temperature
Incheon's September weather shows a modest shift in high-temperatures, falling from August's 29°C (84.2°F) to a still warm 25.5°C (77.9°F). An average low-temperature of 17.5°C (63.5°F) is common in Incheon during the nights of September.Humidity
In September, the average relative humidity is 73.1%.Rainfall
In Incheon, in September, during 8.2 rainfall days, 154mm (6.06") of precipitation is typically accumulated. In Incheon, during the entire year, the rain falls for 101.9 days and collects up to 1235mm (48.62") of precipitation.Sea temperature
In Incheon, the average seawater temperature in September is 21.9°C (71.4°F).Note: Most people do not enjoy swimming in water of 21.9°C (71.4°F). Breathing control becomes harder as the temperature descends from 21°C (69.8°F) to 15°C (59°F).
Daylight
In September, the average length of the day is 12h and 26min.On the first day of September in Incheon, sunrise is at 06:03 and sunset at 19:02. On the last day of the month, sunrise is at 06:27 and sunset at 18:18 KST.
Sunshine
In Incheon, the average sunshine in September is 6.6h.Frequently asked questions
What are the temperatures in Incheon in September?
What is the average humidity in September in Incheon?
How many days does it rain in September in Incheon?
What is the sea temperature in September in Incheon?
What is the average length of the day in September in Incheon?
When is the sunrise / sunset in September in Incheon?
How long on average sun shines in September in Incheon?
Average temperature in September
Incheon, South Korea
- Average high temperature in September: 25.5°C
The warmest month (with the highest average high temperature) is August (29°C).
The month with the lowest average high temperature is January (1.7°C).
- Average low temperature in September: 17.5°C
The month with the highest average low temperature is August (22.4°C).
The coldest month (with the lowest average low temperature) is January (-5.4°C).
Average humidity in September
Incheon, South Korea
- Average humidity in September: 73.1%
The month with the highest relative humidity is July (82.2%).
The month with the lowest relative humidity is January (61.5%).
Average rainfall in September
Incheon, South Korea
- Average rainfall in September: 153.5mm
The wettest month (with the highest rainfall) is July (319.6mm).
The driest month (with the least rainfall) is December (19.3mm).
Average rainfall days in September
Incheon, South Korea
- Average rainfall days in September: 8.2 days
The month with the highest number of rainy days is July (14.9 days).
The month with the least rainy days is February (5.3 days).
Average sea temperature in September
Incheon, South Korea
- Average sea temperature in September: 21.9°C
The best month for swimming (with the highest average sea temperature) is August (23.4°C).
The coldest month (with the lowest average sea temperature) is February (3.3°C).
Average daylight in September /
Average sunshine in September
Incheon, South Korea
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 6h and 4min
The month with the most sunshine is May (Average sunshine: 7h and 30min).
The month with the least sunshine is July (Average sunshine: 5h and 6min).
Incheon, South Korea
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