September weather forecastKumamoto, Japan
September
Weather in September
As Kumamoto transitions into the fall, September records temperatures ranging from a maximum of 26.9°C (80.4°F) to a minimum of 19.6°C (67.3°F). With days gradually shortening, there is less daylight available, yet humidity levels remain moderately high. The city witnesses a slump in the heat, ushering in the freshness of the fall. Sunshine is persistent, yet comfortably warm, making outdoor activities inviting. Moving into October, one can anticipate a more noticeable drop in mercury levels, setting the stage for autumn's full bloom.Temperature
A minor decrease in the average high-temperature is observed in Kumamoto during September, shifting from a tropical 30.4°C (86.7°F) in August to a warm 26.9°C (80.4°F). During September, Kumamoto records a consistent average nighttime temperature of 19.6°C (67.3°F).Humidity
In September, the average relative humidity is 79%.Rainfall
In Kumamoto, in September, during 16 rainfall days, 70mm (2.76") of precipitation is typically accumulated. In Kumamoto, during the entire year, the rain falls for 179.9 days and collects up to 1028mm (40.47") of precipitation.Snowfall
April through November are months without snowfall.Sea temperature
In September, the average sea temperature in Kumamoto is 27°C (80.6°F).Note: Water activities including swimming and diving are pleasurable in temperatures between 25°C (77°F) and 29°C (84.2°F), ensuring comfort and enjoyment for extended time frames.
Daylight
In Kumamoto, the average length of the day in September is 12h and 23min.On the first day of September in Kumamoto, sunrise is at 05:51 and sunset at 18:42. On the last day of the month, sunrise is at 06:10 and sunset at 18:03 JST.
Sunshine
In Kumamoto, the average sunshine in September is 8.9h.UV index
The average daily maximum UV index in September in Kumamoto is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: A daily maximum UV index of 5 in September translates into the following instructions:
Act with care - The suggestion to avoid sunburn is emphasized. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Caution! The Sun's UV intensity grows with reflections off sand and water.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Kumamoto, Japan
- Average high temperature in September: 26.9°C
The warmest month (with the highest average high temperature) is August (30.4°C).
The month with the lowest average high temperature is January (8.3°C).
- Average low temperature in September: 19.6°C
The month with the highest average low temperature is August (23.3°C).
The coldest month (with the lowest average low temperature) is January (1.7°C).
Average pressure in September
Kumamoto, Japan
- Average pressure in September: 1011.9mbar
The month with the highest atmospheric pressure is January (1021.8mbar).
The month with the lowest atmospheric pressure is June (1008.2mbar).
Average wind speed in September
Kumamoto, Japan
- Average wind speed in September: 7.4km/h
The windiest month (with the highest average wind speed) is March (8.7km/h).
The calmest month (with the lowest average wind speed) is June (7km/h).
Average humidity in September
Kumamoto, Japan
- Average humidity in September: 79%
The month with the highest relative humidity is July (83%).
The months with the lowest relative humidity are March and April (72%).
Average rainfall in September
Kumamoto, Japan
- Average rainfall in September: 70mm
The wettest month (with the highest rainfall) is June (216mm).
The driest month (with the least rainfall) is January (36mm).
Average rainfall days in September
Kumamoto, Japan
- Average rainfall days in September: 16 days
The month with the highest number of rainy days is July (23.4 days).
The month with the least rainy days is January (10.5 days).
Average snowfall in September
Kumamoto, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is January (16mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Kumamoto, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.3 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Kumamoto, Japan
- Average sea temperature in September: 27°C
The best month for swimming (with the highest average sea temperature) is August (28°C).
The coldest months (with the lowest average sea temperature) are February and March (18°C).
Average daylight in September /
Average sunshine in September
Kumamoto, Japan
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 8h and 54min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in September
Kumamoto, Japan
- Average sunshine days in September: 11.2 days
The month with the most sunshine days is October (18.1 days).
The month with the least sunshine days is July (4.9 days).
Average UV index in September
Kumamoto, Japan
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Kumamoto, Japan
- Average cloud cover in September: 36
The month with the most cloud cover is June (Cloud cover 50).
The month with the least cloud cover is October (Cloud cover 31).
Average visibility in September
Kumamoto, Japan
- Average visibility in September: 9km
The month with the highest visibility is November (10km).
The months with the lowest visibility are June and July (8km).
