Weather in Hiroshima

Planning your day in Hiroshima or simply want to know what weather awaits you? Below you will find up-to-date information on weather conditions and detailed forecasts.

The climate in Hiroshima, located in Japan, can generally be described as humid subtropical. This means the city experiences four distinct seasons with noticeable fluctuations in temperature and precipitation throughout the year. Visitors should expect significant differences in weather conditions depending on the time of their trip.

Winters (from December to February) in Hiroshima are relatively mild but cool, with average temperatures around 3.9-5.4°C and a small amount of precipitation (averaging 2-3 mm per month). Spring (from March to May) brings gradual warming, with average temperatures rising from 9°C to 17.5°C, and precipitation moderately increasing to 4-5 mm per month. Summer (from June to August) is hot and humid, with average temperatures ranging from 21.2°C to 26.7°C, with August being the warmest month. Autumn (from September to November) is characterised by a pleasant drop in temperature from 23°C to 11.4°C and a decrease in precipitation (from 7 mm in September to 2 mm in November).

A notable feature of Hiroshima's climate, according to the provided data, is the wetter summer period. The data shows that July stands out as the month with the highest amount of precipitation, reaching 10 mm, and the maximum number of rainy days – up to 20. Overall, summer is characterised by increased humidity and more frequent rainfall compared to other seasons, which is important to consider when planning outdoor activities.

The climate in Hiroshima is characterised by noticeable seasonal temperature changes. The hottest month is usually August, when the average temperature reaches 26.7°C, and daytime highs can rise to 30.0°C. Nights in August are also warm, with an average minimum temperature of around 23.4°C. Conversely, the coldest month is January, with an average temperature of 3.9°C. In January, average minimum temperatures drop to 0.6°C, and maximum daytime temperatures rarely exceed 7.1°C.

Summer months in Hiroshima, especially July and August, bring hot weather. Average temperatures in June are around 21.2°C, gradually rising to 25.5°C in July and peaking at 26.7°C in August. Daytime highs at the height of summer (July-August) fluctuate in the range of 28.5°C - 30.0°C, while nights remain warm, with temperatures not falling below 22.5°C - 23.4°C. July also stands out with the highest amount of rainfall and wet days, which can create a sensation of increased humidity.

Winter in Hiroshima is cool, but severe frosts are rare. From December to February, average temperatures hold in the range of 3.9°C to 5.4°C. Nighttime temperatures in January and February can approach freezing (0.6°C - 1.0°C), while during the day the air warms up on average to 7.1°C - 8.6°C. Temperature fluctuations between day and night are most noticeable in transitional seasons; for example, in April the difference between the average maximum (17.7°C) and minimum (8.7°C) temperature is about 9°C, indicating cooler nights compared to daytime warmth.

Hiroshima observes noticeable seasonality in rainfall distribution throughout the year. The highest amount of precipitation falls during the summer months, forming a distinct wet season. This period usually lasts from June to September, reaching its peak in July.

July is the wettest month in Hiroshima: on average, about 10 mm of precipitation falls, and rainy weather is observed for approximately 20 days. June and August are also characterised by increased precipitation (7-8 mm) and a high number of rainy days (15-16 days respectively). During this summer period, precipitation falls primarily in the form of rain.

The driest months are November, December, and January, when the average monthly precipitation is only about 2 mm. October and February are also comparatively dry, with 4 mm and 3 mm of precipitation respectively. Despite the low total amount of precipitation in the winter period, precipitation days still occur: from 8 days in November to 11 days in January. In winter, especially in January, when the average temperature is 3.9°C and the minimum can drop to 0.6°C, precipitation may fall not only as rain but also as wet snow or light snow. However, heavy snowfalls are unlikely due to the small total amount of precipitation.

When planning a trip to Hiroshima, it is important to consider its diverse climate so that your wardrobe matches the weather conditions. Regardless of the season, comfortable walking shoes will be your best companion, as the city is perfect for long walks. The principle of layering in clothing is also very relevant, allowing you to easily adapt to temperature changes throughout the day. Given that even with a small amount of precipitation in millimetres, Hiroshima has many days with precipitation (from 8 to 20 per month), a compact umbrella or a light waterproof jacket will be very useful practically all year round.

Summer months in Hiroshima, from June to August, are characterised by warm and humid weather, with the average temperature hovering around 21-27°C, and the maximum reaching 30°C. The highest amount of precipitation falls during this period, especially in July. Therefore, you should pack light, breathable clothing made of natural fabrics, sunscreen, a hat, and, of course, reliable rain gear in your suitcase. Even in May and September, the weather can be quite warm and humid, so summer recommendations remain relevant.

Winter (December-February) in Hiroshima is cool, with average temperatures around 3-5°C, sometimes dropping to freezing. Although heavy snowfalls do not usually occur, you will need warm clothing: sweaters, an insulated jacket, a hat, a scarf, and gloves. In transitional seasons – spring (March-May) and autumn (October-November) – the weather is changeable. The temperature gradually rises in spring (from 9°C to 17.5°C) and falls in autumn (from 23°C to 11°C). At this time, the ideal solution would be layered clothing: t-shirts, long-sleeved shirts, light jackets or fleece tops, as well as a windbreaker, especially for walks in windy weather.