Cheonan

Stay up to date with the latest weather conditions in Cheonan. Below you'll find current data, forecasts, and helpful weather charts.

The climate in Cheonan, located in South Korea, can be described as humid continental, with four distinct seasons. The city experiences significant temperature fluctuations throughout the year, which is typical for this climate type. Winters here are cold, with average temperatures around or slightly below freezing, while summers are hot and humid.

Spring (March–May) brings a gradual warming and an increase in precipitation, transitioning into a hot and humid summer (June–August). The highest rainfall and most rainy days occur in July and August, marking a pronounced summer monsoon period. Autumn (September–November) is characterized by a pleasant drop in temperature and decreasing precipitation, creating comfortable conditions. Winter (December–February) is cold, with temperatures dipping below freezing and the lowest amount of precipitation of the year.

The climate in Cheonan is characterized by clearly defined seasons with a notable annual temperature range. The coldest month is usually January, when the average temperature drops to -1.1°C, and nighttime minimums can reach -5.3°C. The hottest period is August, with an average temperature of +26.5°C and daytime highs approaching +29.8°C. July is also very warm, with an average value of +26.0°C.

Summer months in Cheonan, especially July and August, are quite hot and, judging by the number of rainy days (17 and 16 days respectively), can be humid. Daytime temperatures consistently stay above +27°C, reaching nearly +30°C. Nights are also warm, with minimum temperatures rarely falling below +22°C. In contrast, winter is cold. From December to February, average temperatures hover around or below freezing. January brings the most severe cold, with daytime highs barely exceeding +3°C and nights remaining consistently frosty.

Spring and autumn are transitional seasons with more moderate temperatures. In March, the average temperature is +7.5°C, and in November it is +7.7°C, indicating a gradual warming and cooling respectively. During these periods, as well as in winter, significant diurnal temperature fluctuations are observed. For example, in April, the difference between the average daytime high (+18.2°C) and nighttime low (+7.5°C) is more than 10 degrees. Even in the winter months, the difference between the daytime maximum and nighttime minimum can reach 8–9 degrees, highlighting the need to be prepared for chilly evenings and nights.

The city of Cheonan sees a fairly clear distinction between wet and dry seasons throughout the year. The highest precipitation occurs during the summer months, while winter is characterized by significantly lower volumes.

The wettest months in Cheonan are July and August. July averages 9 mm of precipitation with about 17 rainy days. August follows closely with 8 mm of precipitation and approximately 16 days with rainfall. During this period, rains can be quite intense, typical of the summer monsoon influence in the region. June and September also bring a moderate amount of precipitation (4–5 mm) and about 10 wet days, framing the peak of the rainy season.

The driest period falls during the winter months. January, February, and December are the most arid, with total precipitation of only 1 mm in each of these months and just 4–5 rainy days. Given the average temperatures near or below freezing during these months (for example, the average temperature in January is -1.1°C and in December 0.1°C), winter precipitation is likely to fall as snow or sleet, albeit in small amounts. Spring (March, April) and autumn (October, November) are transitional months, with moderate precipitation ranging from 2 to 3 mm and 6–9 wet days.

When planning a trip to Cheonan, it's important to consider the distinct seasonal changes characteristic of this region of South Korea. In winter (December to February), it is quite cold, with average temperatures hovering around 0°C and nighttime frosts potentially reaching -5°C. Therefore, you will need warm clothing: a winter jacket, sweaters, a hat, gloves, and a scarf. Although there is little precipitation in winter, it's best to be prepared for a few damp days. Summer (June to August) in Cheonan is warm and humid, with average temperatures rising to 26°C and daytime highs nearing 30°C. July and August are the rainiest months, so be sure to bring an umbrella or a light raincoat, along with light, breathable clothing made from natural fabrics.

Spring (March–May) and autumn (September–November) are transitional seasons with comfortable temperatures but changeable weather. In spring, temperatures gradually rise from 7°C to 18°C, while in autumn, they drop from 22°C to 8°C. During these periods, it's best to use a layering strategy: T-shirts, light sweaters, cardigans, and a windbreaker or mid-season jacket will allow you to easily adapt to temperature changes throughout the day. The number of rainy days in spring and autumn is moderate, but an umbrella may still come in handy. Regardless of the time of year, comfortable walking shoes are recommended for exploring Cheonan and its attractions.

In the summer months, in addition to a raincoat, don't forget sunscreen and a hat, as the sun can be quite strong. Generally, Cheonan is characterized by noticeable temperature fluctuations not only between seasons but also throughout the day, especially in spring and autumn. Therefore, the ability to add or remove a layer of clothing will ensure your comfort during your trip.