Koriyama

Find out the latest weather in Koriyama. Detailed data, charts, and forecasts for the near future are provided below to help you plan your day in the best possible way.

The climate in Koriyama, Japan, can be described as temperate with four distinct seasons. The city experiences significant temperature fluctuations throughout the year, typical for regions with continental influence in temperate latitudes. Visitors should be prepared for various weather conditions depending on the timing of their trip.

Winters in Koriyama (December–February) are quite cold, with average temperatures around zero or slightly below, sometimes dropping to -3°C. Spring (March–May) brings gradual warming, replacing the chill with pleasant, moderate temperatures. Summer (June–August) is warm and sometimes hot, with average temperatures reaching 23–24°C, especially in July and August. Autumn (September–November) is characterized by a gradual decrease in temperature, creating comfortable conditions for walking.

Precipitation is distributed throughout the year; however, there is an increase in rainy days during the summer months, particularly in July, which sees up to 20 days of precipitation. Despite the frequency, the total amount of precipitation is not extremely high, suggesting frequent but not overly intense rain during this period. Overall, Koriyama offers a diverse climatic experience, allowing you to enjoy the beauty of each season.

The city of Koriyama in Japan is characterized by pronounced seasonal temperature fluctuations. The hottest month here is traditionally August, when the average air temperature is 24.6°C, and daytime highs can reach 28.1°C. Conversely, January is considered the coldest month: the average temperature during this period drops to -0.4°C, and nighttime lows can reach -3.4°C. Thus, the annual temperature range in Koriyama is quite wide, demonstrating a clear change of seasons.

The summer months in Koriyama, from June to August, bring warmth. In June, the average temperature stays around 19.0°C, gradually rising to the peak values of August. Daytime temperatures in summer vary from a pleasant 22.9°C in June to a hot 28.1°C in August. Nights also remain warm, with average minimum temperatures ranging from 15.1°C to 21.2°C, creating comfortable conditions for evening strolls. July and August also stand out for having the highest number of rainy days, which can affect the perceived temperature.

The winter period, which lasts from December to February, is quite cool in Koriyama and at times frosty. Average monthly temperatures during this time range from -0.4°C in January to 2.1°C in December. At night, the thermometer often drops below freezing, reaching its minimum values in January. Daytime highs in winter usually remain low, ranging from 2.7°C to 5.2°C. Spring (March–May) and autumn (September–November) are transition seasons with gradual temperature changes. Notable diurnal temperature fluctuations occur throughout the year; for example, in March and April, the difference between the daytime maximum and nighttime minimum can be around 8–9°C.

The city of Koriyama sees a fairly distinct distribution of precipitation throughout the year, with a pronounced wet period in summer and drier, yet still precipitation-prone, winter months. The total amount of precipitation is not extremely high, but it is distributed over a significant number of days in most months.

The highest amount of precipitation occurs in the summer and early autumn months. July stands out as the wettest month, with an average precipitation of 6 mm and approximately 20 rainy days. June (5 mm, 15 days), August (4 mm, 18 days), September (5 mm, 15 days), and October (5 mm, 13 days) are also characterized by increased humidity. During these warm months, precipitation falls mainly as rain.

The winter months—January, February, and December—as well as November, are the driest in terms of total precipitation volume, which is only 2 mm in each of these months. However, the number of days with precipitation remains substantial: 15 days in January and December, 13 days in February, and 11 days in November (the fewest rainy days in the year). Considering the average temperatures, which drop to -0.4°C in January and are around 2.1°C in December, winter precipitation in Koriyama likely falls as light snow or sleet.

In summary, Koriyama is characterized by frequent but not very heavy precipitation. In summer, this is mainly rain, most intense in July, and in winter, light snowfall. The spring and autumn months serve as transition periods, with gradual changes in the nature and amount of precipitation.

When planning a trip to Koriyama, it's important to consider the weather conditions to ensure your stay is as comfortable as possible. Regardless of the time of year, comfortable walking shoes will be your best companion, as the city and its surroundings are perfect for exploring on foot. Given that the number of rainy days is significant throughout the year, especially in the summer months, a compact umbrella or a light raincoat will come in handy. Layering is an excellent clothing strategy for Koriyama, allowing you to easily adapt to temperature changes throughout the day, particularly during the transition seasons.

The winter months (December to February) in Koriyama are quite cold, with average temperatures hovering around 0°C and overnight frosts. You will need warm clothes: sweaters, fleece jackets, an insulated winter coat, a hat, a scarf, and gloves. Although the total precipitation in millimeters is low, days with precipitation (snow or freezing rain) are frequent, so waterproof shoes and outerwear will be useful. In spring (March–May) and autumn (September–November), the weather is changeable. Temperatures gradually rise in spring and fall in autumn, so it's worth bringing a mid-season jacket, a few sweaters or cardigans, and a hat for windy weather.

Summer in Koriyama (June to August) is warm and humid, with average temperatures reaching 23–25°C. During this period, especially in July when the highest number of rainy days is observed (up to 20 days), light and breathable clothing made of natural fabrics—T-shirts, shorts, light trousers, and dresses—is recommended. Don't forget sunscreen and a hat for sun protection on clear days. Even in summer, a light windbreaker or cardigan might be useful for evening walks or in case of a sudden cold snap after rain.