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Contents
- The climate of Incheon
- The best time to visit Incheon
- The worst time to visit Incheon
- Spring weather in Incheon
- Summer weather in Incheon
- Autumn weather in Incheon
- Winter weather in Incheon
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average humidity
- Average rainfall
- Average rainfall days
- Average sea temperature
- Average daylight
- Average sunshine
Climate and monthly weather forecast
The climate of Incheon
Stepping onto the terrain of Incheon, South Korea, an individual encounters a distinct Cwa climate according to the Köppen climate classification. This notation corresponds to a humid subtropical climate with a dry winter. Nestled in the northwestern part of South Korea, Incheon experiences a variety of weather conditions throughout the year due to its geographical position.
A quick look at the yearly climatological data reveals that the city has significant temperature variations, from the chilliest lows of -5.4°C (22.3°F) in winter to the sizzling highs of 29°C (84.2°F) in late summer. Interestingly, the humidity level stays relatively stable throughout the year, with slight fluctuations ranging between 61.5% to a high of 82.2%. Rainfall records indicate a pattern of a dry and a wet season, with precipitation peaking dramatically from 112mm (4.41") in June to a high of 320mm (12.6") in July.
A unique pattern that stands out in the sea temperatures of Incheon indicates adaptation to the overall continental trends: starting at a low of 3.3°C (37.9°F) in the harsh winter months and rising to a warm 23.4°C (74.1°F) in the heart of summer. With regard to daylight, the year sees a varying pattern, from a low of 9.9 hours in the winter months to a high of 14.7 hours during the summer solstice. Sunshine hours show negligible variation, oscillating between 5.1 hours in the cloudy July to 7.5 hours in the comparatively sunny May.
A quick look at the yearly climatological data reveals that the city has significant temperature variations, from the chilliest lows of -5.4°C (22.3°F) in winter to the sizzling highs of 29°C (84.2°F) in late summer. Interestingly, the humidity level stays relatively stable throughout the year, with slight fluctuations ranging between 61.5% to a high of 82.2%. Rainfall records indicate a pattern of a dry and a wet season, with precipitation peaking dramatically from 112mm (4.41") in June to a high of 320mm (12.6") in July.
A unique pattern that stands out in the sea temperatures of Incheon indicates adaptation to the overall continental trends: starting at a low of 3.3°C (37.9°F) in the harsh winter months and rising to a warm 23.4°C (74.1°F) in the heart of summer. With regard to daylight, the year sees a varying pattern, from a low of 9.9 hours in the winter months to a high of 14.7 hours during the summer solstice. Sunshine hours show negligible variation, oscillating between 5.1 hours in the cloudy July to 7.5 hours in the comparatively sunny May.
The best time to visit Incheon
Given the variability of the climate, a favorable time to visit Incheon would be during the transitional seasons of spring and autumn. In the spring months, Incheon is often bathed in pleasant temperatures ranging from 9.6°C (49.3°F) to 21.3°C (70.3°F), coupled with moderate rainfall, making it an ideal time for sightseeing. Similarly, autumn presents a gentle retreat from the summer heat, featuring declining temperatures from 25.5°C (77.9°F) to 11.8°C (53.2°F) and a reduced rainfall.
The worst time to visit Incheon
The least favorable time to set foot in Incheon is likely during the intense summer months. July, as the peak of the wet season, witnesses tremendous rainfall levels reaching up to 320mm (12.6"), accompanied by high relative humidity at 82.2%. Travelling during winter also poses challenges due to the plummeting temperatures to as low as -5.4°C (22.3°F), coupled with the coldest sea temperatures.
Spring weather in Incheon
Incheon's spring welcomes a soothing transformation with temperatures moderately rising from 1.7°C (35.1°F) to 21.3°C (70.3°F). It experiences light to moderate rainfall, peaking at 58mm (2.28") in April, offering a refreshing respite from the dry winter. Spring also welcomes an increase in daylight hours, gradually extending from 12 hours in March to 14.2 hours in May, and a steady rise in sea temperatures from 4.1°C (39.4°F) to 13.3°C (55.9°F).
Summer weather in Incheon
The summer in Incheon is characterized by a heightened temperature that hits a peak of 29°C (84.2°F) in August. The season is marked by substantial rainfall, hitting a peak of 320mm (12.6") in July, accompanied by a surge in humidity levels reaching up to 82.2%. Despite the weather conditions, the sea becomes pleasantly warm, reaching up to 23.4°C (74.1°F), inviting for water-related activities.
Autumn weather in Incheon
Autumn ushers in a pleasant decline in temperature from 25.5°C (77.9°F) to 11.8°C (53.2°F) in Incheon. Accompanied by a decrease in rainfall from 154mm (6.06") to 51mm (2.01"), the season offers a perfect blend of comfortable temperatures and drier conditions. Autumn also marks a reduction in daylight hours from 12.4 hours to 10.2 hours, providing a gentle transition towards the chillier winter season.
Winter weather in Incheon
Winter descends upon Incheon with a sharp drop in temperatures, registering lows of -5.4°C (22.3°F) in the coldest months. The season is also the driest with the least rainfall, registering only 19mm (0.75") in December. Winter in Incheon witnesses a reduction in daylight hours to a yearly low of 9.6 hours in December and sea temperatures dropping to a yearly low at 3.3°C (37.9°F) in February, painting a stark, cold picture of the city.
Weather in January
Incheon enters the year with chilly weather, a feature of winter season in this South Korean coastal city. January's temperatures range from -5.4°C (22.3°F) to 1.7°C (35.1°F), making it the coldest month of the year. Activity remains indoors as frostbite fiercely grapples with the residents. Weather in January »
Weather in February
Moving into February, an improvement from the extreme cold experienced in January is noticeable, though the conditions remain objectively chilly. The rainy period is yet to kick in, as rainfall numbers stay quite low. Sunlight slowly starts showing its face more often and for longer, an indication that the thick of winter is behind Incheon. Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Incheon, South Korea, with temperature in the range of an average high of 9.6°C (49.3°F) and an average low of 1.7°C (35.1°F). Incheon in March shows a temperature shift, moving from an average high of a wintry 4.4°C (39.9°F) in February to a chilly 9.6°C (49.3°F). Weather in March »
Weather in April
In April, we witness substantial changes in weather conditions in Incheon. Even with the arrival of longer days and increased sunlight, the consistent trend of rainfall witnessed from March intensifies. Though the sky might seem clear and blue, it's not unusual to experience sudden showers due to increase in humidity. Weather in April »
Weather in May
The mild spring temperatures witnessed in April give way to a much warmer May. The rise in temperature is coupled with an increase in regular rainfall, marking the onset of the anticipated wet season. The sea becomes more welcoming with its increasingly warming temperatures, sparking the start of the beach season. Weather in May »
Weather in June
Summer kicks in earnestly in June. Noticeably, the rainfall exceeds 100mm (3.94"), indicating we are in the midst of the rainy season. The elevated level of humidity sometimes creates an uncomfortable level of stickiness. But residents have the warmer sea temperatures as a respite from the increased heat. Weather in June »
Weather in July
July represents the zenith of the summer season in Incheon. Maximum temperatures go to an average of 27.6°C (81.7°F), presenting the year's highest temperatures. The recurring heavy rainfall causes an increase in humidity, reaching an annual high of 82.2%. Weather in July »
Weather in August
August comes burdensome with the continuation of high heat, intense humidity, and frequent rainfall. The frequency of rainfall reduces slightly compared to July while the temperatures slightly increase. High relative humidity becomes the norm during this month, increasing the discomfort in the city. Weather in August »
Weather in September
September is the month that provides a relief to Incheon's populace from the imposing heat of the summer season. Even though the temperatures remain high, they record a gradual decline, starting the slow descent into cooler fall weather. Weather in September »
Weather in October
October continues gently ushering the city back to its cool state, leaving behind the heat of mid-year. Light jackets and scarves begin to make appearances as residents adjust to the cooler climate. The quantity of rainfall continues its decline, and the autumn foliage creates a palette of hues across the city. Weather in October »
Weather in November
In November, winter begins to sniff around the corner in Incheon while the fall season takes its bow. The sharp drop in temperature necessitates heavier clothing to fight off the cold. However, the drastic decrease in temperature is not matched with a corresponding increase in the city's rainfall. Weather in November »
Weather in December
December sees the onset of winter in Incheon with temperatures plummeting to reach a low of -2.6°C (27.3°F). This chilly weather limits outdoor activities and social gatherings mainly take place indoors. The decrease in rainfall coupled with shorter days characterizes the winter season. Weather in December »
Updated: Aug 29, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
January is the month that records the lowest temperatures, with averages ranging from a high of 1.7°C (35.1°F) to a low of -5.4°C (22.3°F).
What is the least humid month?
With an average relative humidity of 61.5%, January is the least humid month in Incheon.
How much does it rain?
Throughout the year, there are 101.9 rainfall days, and 1235mm (48.62") of precipitation is accumulated.
When is the sea coldest?
February is the month with the coldest seawater in Incheon, with an average sea temperature of 3.3°C (37.9°F).
What month has the most sunshine?
The month with the most sunshine is May, with an average of 7.5h of sunshine.
When are the longest days?
The month with the longest days in Incheon is June, with an average of 14h and 42min of daylight.
What is the most humid month?
With an average relative humidity of 82.2%, July is the most humid month.
What is the wettest month?
The month with the most rainfall is July, when the rain falls for 14.9 days and typically aggregates up to 320mm (12.6") of precipitation.
What is the month with the least sunshine?
With an average of 5.1h of sunshine, July has the least sunshine of the year.
What are the warmest months?
August registers as the month with the average highest temperatures, reaching 29°C (84.2°F) at its peak and 22.4°C (72.3°F) at the lowest.
What month is the sea warmest?
The month with the warmest seawater in Incheon is August, with an average sea temperature of 23.4°C (74.1°F).
What is the driest month?
December is the month with the least rainfall. Rain falls for 7.3 days and accumulates 19mm (0.75") of precipitation.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 36min of daylight.
Is there Daylight Saving Time (DST)?
Incheon does not utilize Daylight Saving Time (DST). KST timezone is used throughout the entire year.
Average temperature
Incheon, South Korea
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).
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
Incheon, South Korea
- Average humidity in January:
61.5% - Average humidity in February:
61.8% - Average humidity in March:
63.4% - Average humidity in April:
64.1% - Average humidity in May:
70.3% - Average humidity in June:
74.8%
The month with the highest relative humidity is July (82.2%).
The month with the lowest relative humidity is January (61.5%).
Average rainfall
Incheon, South Korea
- Average rainfall in January:
20.6mm - Average rainfall in February:
20.8mm - Average rainfall in March:
40.5mm - Average rainfall in April:
57.7mm - Average rainfall in May:
100.3mm - Average rainfall in June:
112mm
- Average rainfall in July:
319.6mm - Average rainfall in August:
285.8mm - Average rainfall in September:
153.5mm - Average rainfall in October:
53.4mm - Average rainfall in November:
51mm - Average rainfall in December:
19.3mm
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
Incheon, South Korea
- Average rainfall days in January:
6.6 days - Average rainfall days in February:
5.3 days - Average rainfall days in March:
6.7 days - Average rainfall days in April:
7.3 days - Average rainfall days in May:
8.7 days - Average rainfall days in June:
9.7 days
- Average rainfall days in July:
14.9 days - Average rainfall days in August:
12.5 days - Average rainfall days in September:
8.2 days - Average rainfall days in October:
6.2 days - Average rainfall days in November:
8.5 days - Average rainfall days in December:
7.3 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
Incheon, South Korea
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 / Average sunshine
Incheon, South Korea
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 1min - Average daylight in June:
14h and 4min
- Average daylight in July:
14h and 3min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 4min
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 January:
5h and 4min - Average sunshine in February:
6h and 3min - Average sunshine in March:
6h and 4min - Average sunshine in April:
7h and 2min - Average sunshine in May:
7h and 3min - Average sunshine in June:
6h and 5min
- Average sunshine in July:
5h and 1min - Average sunshine in August:
6h and 1min - Average sunshine in September:
6h and 4min - Average sunshine in October:
6h and 5min - Average sunshine in November:
5h and 4min - Average sunshine in December:
5h and 3min
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).
