Kōchi Weather in September
September in Kōchi averages 23°C (73°F) during the day and 15°C (59°F) at night. Quite a bit of rainfall is typical this month, with around 196 mm (7.7 in) on average. An umbrella is a good idea.
Rainfall in Kōchi in September
Typically, about 21 days will experience rainfall, with an average of 196 mm (7.7 in) for the month. This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.
Temperature in Kōchi in September
In September, Kōchi gets high temperatures, with highs of 23°C (73°F). Nights cool to around 15°C (59°F). During September, you'll experience the summer season. Conditions stay fairly consistent through the month, making it easier to plan what to wear. Nights drop to around 15°C (59°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in Kōchi in September
The area experiences a moderate amount of sunshine, with approximately 163 hours of sunlight expected. This means a decent mix of sun and overcast.For Kōchi itself, June and August generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Kōchi's climate page.
Kōchi Temperature in September
Min Temperature
15°C (59°F)
Max Temperature
23°C (73°F)
Chance of Rain
70%
Precipitation
196 mm (7.7 in)
Rainy days
21 days
Humidity
74%
Sunshine
163 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Kōchi typically drop from around 26°C (79°F) at the start of September to approximately 21°C (70°F) by the end. Nights are pleasant, with lows typically ranging from 14°C (57°F) to 20°C (68°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Kōchi in September
Browse day-by-day weather records for Kōchi spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Kōchi historical weather extremes in September
Based on weather observations in Kōchi between 1976 and 2025, these are the recorded extremes during September.
- Kōchi recorded its highest September temperature of 35°C (95°F) on September 3, 1984.
- The lowest daytime temperature in September was 10°C (50°F), recorded on September 28, 2005.
- Kōchi registered its coldest September night on September 29, 2005, with temperatures dropping to 6°C (43°F).
Best Places in Japan in September
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Kōchi in September
For Kōchi in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Also bring a poncho, it will rain a lot! Waterproof everything you can. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Kōchi in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Kōchi's climate page.
Temperature Rainfall Sunshine Humidity
See the full Kōchi climate overview or explore weather in Japan.
