Climate and monthly weather forecastKochi, Japan

The climate of Kochi

Located on the southern coast of Japan's Shikoku Island, Kochi experiences a Humid subtropical climate characterized by a hot, wet summer and mild winter as defined by the Köppen climate classification (Cfa). Predominantly, there is no dry season and the weather is quite moderate throughout the year with rainfall and high humidity being key elements of this climate.

Over the year, the temperature in Kochi varies from 1.6°C (34.9°F) in the cooler months to 31.9°C (89.4°F) during the hottest periods. Overall, the climate fluctuates considerably with average relative humidity hovering between 59% to 78%. Despite the claim that a substantial amount of rainfall occurs throughout the year, it ranges from 58mm (2.28") in the driest months to 350mm (13.78") in the months with maximum precipitation.

Uniquely, Kochi has a significant number of rainfall days, hitting a peak of 20.1 days in the rainiest months while dropping to 12 days in the less wet periods. The city also enjoys sunshine hours varying from 4.7 hours to 6.6 hours and daylight hours span from a low of 10 hours to a high of 14.4 hours. The ultraviolet index value, providing insight into potential sun exposure risk, ranges from low (3) in the darker months to extremely high (11) during sunniest periods.

The best time to visit Kochi

Kochi provides warmth and ample sunshine hours, making the spring months from March to May welcoming for tourists. During this period, temperatures rise steadily from 15.9°C (60.6°F) to 24.4°C (75.9°F) coupled with decreasing rainfall from 190mm (7.48") to 292mm (11.5"). Sea temperature improves from 16.9°C (62.4°F) to 20.8°C (69.4°F) making it comfortable for water activities. With UV index moderating from 6 to 10, it would be prudent to carry suitable sun protection gear.

The worst time to visit Kochi

The summer months from June to August are the least advised for visitation given the surge in temperatures and humidity. During these months, the city faces the maximum temperature of 30.7°C (87.3°F) to 31.9°C (89.4°F) and humidity peaking at 78%. Coupled with an increase in rainfall and sea temperatures hit highs of 26.7°C (80.1°F) to 27.8°C (82°F), these conditions make outdoor activities less comfortable and enjoyable.

Spring weather in Kochi

Spring in Kochi brings mild and pleasant weather. Temperatures begin to rise from March, averaging from 15.9°C (60.6°F) to 20.8°C (69.4°F) by May. There is an accompanying drop in rainfall from 190mm (7.48") to 292mm (11.5") in the midst of spring and Ultraviolet index increasing from 6 to 8 nudging towards caution for sun-sensitive individuals. Humidity levels hover between 62% and 70% during these months.

Summer weather in Kochi

Summers in Kochi are notably hot and humid. Maximum temperatures reach 30.7°C (87.3°F), climbing further to 31.9°C (89.4°F) in August. The rainfall peaks as well this season, with the largest rainfall registers between 328mm (12.91") and 346mm (13.62"). Humidity levels rise to 77% and 78%, and the Ultraviolet index hits the roof at 11, indicating extreme caution for prolonged sun exposure.

Autumn weather in Kochi

Autumn witnesses a gradual reduction in temperature — from 29.3°C (84.7°F) in September to a much cooler 19.3°C (66.7°F) by November. Rainfall decreases considerably from 350mm (13.78") to 125mm (4.92"), but Kochi remains relatively humid with values from 73% in September to 67% in November. The Ultraviolet index also reduces, moving from 9 in September to a 4 in November, relieving visitors from extreme sun exposure.

Winter weather in Kochi

Winter months (December to February) are relatively mild in Kochi, with temperatures fluctuating between 1.6°C (34.9°F) and 12.9°C (55.2°F). Rainfall remains at its lowest with values ranging from 58mm (2.28") to 106mm (4.17"). The reduced humidity during this period (59% to 63%) and the low Ultraviolet index values (ranging from 3 to 4) make it an ideal time for outdoor activities without worrying about excessive sun exposure.

Weather in January

Beginning the year in Kochi, Japan, the climate expresses a chill, as temperatures typically hover at a low of 1.6°C (34.9°F), making it an ideal month for those preferring cooler conditions. Rainfall is moderate compared to the other months, but humidity remains relatively low. Weather in January »

Weather in February

The climate in February experiences a slight increase in temperature, but remains cool, revealing a transition from winter to spring in Kochi, Japan. Rainfall increases substantially from the initial month, creating a moist andgreen environment, while also slightly increasing the humidity. Weather in February »

Weather in March

Weather in March presents a substantial increase in temperatures, signaling the arrival of spring in Kochi, Japan. The city's rainfall peaks up to 190mm (7.48"), with relative humidity also on the rise, suggesting some umbrella days might be in order. Weather in March »

Weather in April

April brings warmer days to Kochi, with temperatures reaching up to 20.8°C (69.4°F), indicating the transition to a warmer season. City life sees more rainfall and humid conditions, which adds vibrancy to the local flora. While daylight hours extend slightly from the previous month, the UV index continues to rise. Weather in April »

Weather in May

May signifies the onset of summer in Kochi, Japan, as the days get considerably warmer. Rainfall levels rise, reaching 292mm (11.5"), and the trends point towards frequent showers enhancing the city's lush scenery. Despite increased temperature and humidity levels, daylight and sunshine hours remain fairly consistent. Weather in May »

Weather in June

June marks the start of a rainy season in Kochi, the city experiencing the highest relative humidity of the year. The month continues the summer trend with warm temperatures and long daylight hours persisting. Despite the substantial rainfall, the sea temperature remains agreeably warm. Weather in June »

Weather in July

July features the highest temperatures in Kochi, soaring to 30.7°C (87.3°F), marking the peak of summer. Coinciding with the hottest temperatures, the city also records one of its highest rainfall and highest sea temperatures, leading to a truly tropical environment. Weather in July »

Weather in August

August carries on the high temperatures from July in Kochi, Japan, albeit with a slight drop in rainfall. Even though the city witnesses a reduction in daylight hours, high humidity levels coupled with warm temperatures create a typical tropical summer environment. Weather in August »

Weather in September

As September begins, Kochi experiences a drop in temperature. The city sees a dramatic increase in rainfall, reaching up to 350mm (13.78"), making it the wettest month of the year. Despite the shift in weather patterns, the sea maintains its welcoming warmth, providing an ideal setting for water sports. Weather in September »

Weather in October

Transitioning into the cooler months, October in Kochi brings a decline in temperature, rainfall and humidity, signaling the start of autumn. Pleasant daytime temperatures and a moderation in rainfall, make it a month for outdoor activities, prepping Kochi for the mild winter soon to follow. Weather in October »

Weather in November

November in Kochi signifies the changing seasons with a further decline in temperature, rainfall, and sea temperature. Even though rainfall reduces drastically from the prior month, a slight increase in sunshine hours brightens the city. Weather in November »

Weather in December

Concluding the year in Kochi, temperatures seem to hit a low of 3.8°C (38.8°F), signaling the onset of winter.. The city experiences a further decline in temperatures, daylight hours and sea temperatures, implying colder and shorter days. Weather in December »