Kumamoto Weather in September
Thinking of visiting Kumamoto in September? Expect high temperatures reaching 29°C (84°F) during the day, dropping to 21°C (70°F) at night, and note that quite a bit of rainfall is likely.
Rainfall in Kumamoto in September
You can expect rain on roughly 17 days based on historical data, averaging 171 mm (6.7 in) for the month. Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.
Temperature in Kumamoto in September
In September, Kumamoto gets high temperatures, with highs of 29°C (84°F). Nights cool to around 21°C (70°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights are mild at around 21°C (70°F), which is comfortable for most people.
Sunshine in Kumamoto in September
You can expect a moderate amount of sunlight, with approximately 177 hours. This means a pleasant mix of sun and overcast.If your ideal day consists of dry skies and pleasant temperatures, October typically offers the best circumstances for Kumamoto.
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 Kumamoto's climate page.
Kumamoto Temperature in September
Min Temperature
21°C (70°F)
Max Temperature
29°C (84°F)
Chance of Rain
58%
Precipitation
171 mm (6.7 in)
Rainy days
17 days
Humidity
71%
Sunshine
177 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Kumamoto typically drop from around 31°C (88°F) at the start of September to approximately 27°C (81°F) by the end. Nights are warm, with lows typically ranging from 18°C (64°F) to 23°C (73°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 Kumamoto in September
Browse day-by-day weather records for Kumamoto spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Kumamoto historical weather extremes in September
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Kumamoto.
- The hottest September day on record in Kumamoto reached 37°C (99°F) (September 15, 2024).
- Kumamoto experienced its chilliest September day on September 29, 2012, reaching only 19°C (66°F).
- Kumamoto registered its coldest September night on September 27, 1987, with temperatures dropping to 8°C (46°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
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What to Wear in Kumamoto in September
Warm but pleasant conditions in Kumamoto in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Kumamoto 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 Kumamoto's climate page.
Temperature Rainfall Sunshine Humidity
See the full Kumamoto climate overview or explore weather in Japan.
