September weather forecast
Kochi, Japan

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. Sunlight remains moderately abundant, however, daylight hours start decreasing. Prioritizing rain-gear becomes essential as October brings further cooling temperatures.

Temperature

September's arrival brings an average high-temperature of a moderately hot 29.3°C (84.7°F), slightly deviating from August's 31.9°C (89.4°F). Kochi records an average nighttime low-temperature of 21°C (69.8°F) throughout September.

Heat index

The heat index value during September is computed to be a tropical 34°C (93.2°F). Ensure extra safety steps, heat exhaustion and heat cramps are likely. Long activity might lead to heatstroke.
When referencing the heat index, its values are suitable for shady environments and light breezes. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', combines both the air temperature and the humidity level to give a perceived human temperature. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Kids are generally in more danger than adults because they perspire less. Their large skin surface area compared to their small bodies and the excessive heat due to their actions raises their risk.

Humidity

In Kochi, the average relative humidity in September is 73%.

Rainfall

The month with the most rainfall in Kochi is September, when the rain falls for 18.5 days and typically aggregates up to 350mm (13.78") of precipitation.

Sea temperature

In Kochi, the average seawater temperature in September is 27°C (80.6°F).
Note: In water activities such as swimming and diving, temperatures from 25°C (77°F) to 29°C (84.2°F) are deemed highly pleasurable for extended periods without any unease.

Daylight

In Kochi, the average length of the day in September is 12h and 23min.
On the first day of the month, sunrise is at 05:39 and sunset at 18:31. On the last day of September, in Kochi, sunrise is at 05:59 and sunset at 17:52 JST.

Sunshine

The average sunshine in September is 5.4h.

UV index

The average daily maximum UV index in September in Kochi is 9. A UV Index estimate of 8 to 10 represents a very high health risk from exposure to the Sun's UV rays for average individuals.
Note: In September, the UV index of 9 transforms into the following advice:
Ensure you act responsibly. Without precautions, skin and eyes can suffer. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Post an outdoor workout or swimming, a broad-spectrum SPF 30+ sunscreen should be applied generously and frequently. Attention! UV radiation is ramped up when reflecting off sand and water surfaces.