Choshi

Heading to Choshi? Get the latest weather updates! This section provides current weather reports, forecasts, and detailed charts to help you plan your day.

The climate in Choshi, Japan, is best described as temperate maritime, with four distinct seasons. Throughout the year, there are noticeable temperature fluctuations, ranging from cool winter months to warm, and sometimes hot, summers. Precipitation occurs year-round, though its intensity and frequency vary by season.

Winter in Choshi (December–February) is relatively mild, with average temperatures around 7–9°C; this is the driest time of year, though rainy days are still common. Spring (March–May) brings a gradual and pleasant warming, with average temperatures rising from 11°C to nearly 19°C, alongside a slight increase in rainy days. Summer (June–August) is characterized by warm and humid weather, with average temperatures ranging from 22–27°C; this period is also marked by frequent precipitation. Autumn (September–November) begins warm but gradually turns cooler. September and October stand out as the wettest months with the highest number of rainy days, making them the most humid period of the year before November brings drier and cooler conditions.

The city of Choshi experiences a noticeable shift in temperature regimes throughout the year. The coldest month is typically January, with an average temperature of about 7.0°C, where daily highs barely reach 9.4°C and nightly lows drop to 4.6°C. In contrast, August brings the hottest weather: the average temperature rises to 27.2°C, with daily peaks around 29.2°C and nights remaining warm at 25.2°C. Thus, the annual temperature cycle shows a smooth transition from cool winters to warm and hot summers.

Summer months in Choshi, especially July and August, are characterized by consistently warm weather. In June, the average temperature is a comfortable 21.8°C (ranging from 19.8°C at night to 23.8°C during the day), gradually rising to its peak in August. During the hottest month, daytime temperatures average 29.2°C, while nights stay around 25.2°C. The difference between day and night temperatures in summer is relatively small, usually within 2–4°C, ensuring warm evenings and nights.

Winter in Choshi, spanning December, January, and February, feels cool but not harsh. Average temperatures range from 7.0°C in January to 9.4°C in December. Nighttime frosts are not typical, as minimum temperatures usually stay above freezing—for example, around 4.6°C in January and 5.2°C in February. Daytime highs in winter hover around 9–12°C. Temperature fluctuations between day and night are slightly more pronounced in winter than in summer, at about 4–5°C, making mornings and evenings feel significantly cooler than midday.

In Choshi, precipitation is distributed fairly evenly throughout the year, without a distinct "heavy monsoon" season or prolonged droughts typical of some other regions in Japan. However, there are periods with more frequent, albeit mostly light, rainfall, as well as drier months.

The highest rainfall, though still moderate, usually occurs in June and October, with an average of 7 mm. September is also one of the wettest months with 6 mm of precipitation. In terms of frequency, September and October lead the way, with rain occurring approximately 16 days per month. The period from March to July is also characterized by frequent but light rain, with 12 to 14 rainy days per month and precipitation amounts ranging from 4 mm to 7 mm.

The driest months in Choshi are January and December. During this time, only about 2 mm of precipitation falls, with an average of 9–10 rainy days. February and August also see low precipitation levels (3 mm). Given the average monthly temperatures, which rarely drop near freezing even in winter, precipitation in Choshi falls primarily as rain; snowfall is highly unlikely.

Overall, Choshi's climate is characterized by frequent but mostly light rain for much of the year. Even in the wettest months, total volumes remain low. This suggests that drizzling or short, light showers are more common than intense downpours—something to keep in mind when planning outdoor activities.

When planning a trip to Choshi, it is important to consider the changeable weather typical of this coastal city. Regardless of the season, comfortable walking shoes will be your best companion, as the city is perfect for exploring on foot. Given the significant number of rainy days throughout the year, even when rainfall is light, a compact umbrella or a light waterproof jacket will be very useful. Layering your clothes is an excellent strategy for Choshi, allowing you to easily adapt to temperature fluctuations during the day.

In the winter months (December to February), when average temperatures range from 7°C to 9.4°C and lows can drop to 4.6–6.9°C, you will need warm clothing. We recommend bringing a warm jacket (preferably windproof, given the coastal location), sweaters, warm trousers, as well as a hat, scarf, and gloves, especially for evening strolls. In spring (March–May), the weather becomes milder but still requires foresight. A light or mid-weight jacket, jumpers, and cardigans will keep you comfortable in average temperatures ranging from 11.4°C to 18.8°C. Rain is also likely during this transitional season, so a raincoat is a good idea. Autumn (September–November) weather is equally variable. September is still quite warm (average temperature around 24.5°C), so light summer clothing with an extra layer for the evening may suffice. However, by October (avg. ~19.5°C) and especially November (avg. ~15°C), it becomes noticeably cooler, so pack a mid-weight jacket, sweaters, and warmer trousers. The probability of rain remains high throughout autumn, so rain protection is essential.

Summer in Choshi (June–August) is warm, with average temperatures between 21.8°C and 27.2°C. During this period, light and breathable clothing made of natural fabrics, such as T-shirts, shorts, skirts, and light dresses, is preferred. Don’t forget sunscreen, a hat, and sunglasses for sun protection. June, July, September, and October have the highest number of rainy days, so even in summer, light rain gear can be handy. Layering can also be useful in early and late summer when evenings can be cooler.