September weather forecast
Kumamoto, Japan

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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.

Frequently asked questions

What are September temperatures in Kumamoto?

The high-temperature, in September, in Kumamoto, records 26.9°C (80.4°F), while the low-temperature is 19.6°C (67.3°F). In August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is computed to be 38°C (100.4°F).

What is the average humidity in September in Kumamoto?

The average relative humidity in September in Kumamoto is 79%.

How many days does it rain in September in Kumamoto?

In Kumamoto, in September, during 16 rainfall days, 70mm (2.76") of precipitation is typically accumulated.

When it does not snow in Kumamoto?

April through November are months without snowfall in Kumamoto.

How warm is the water in September in Kumamoto?

In Kumamoto, in September, the average water temperature is 27°C (80.6°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the average length of the day in September in Kumamoto?

The average day length in September in Kumamoto is 12h and 23min.

When is the sunrise / sunset in September in Kumamoto?

On the first day of September, 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.

How many hours of sunshine does Kumamoto have in September?

In September, the average sunshine duration is 8.9h.

What is the UV index intensity in September in Kumamoto?

In September, the average daily maximum UV index in Kumamoto is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Kumamoto, Japan

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in September - Kumamoto, Japan
  • Average daylight in September: 12h and 2min

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 5min

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 - 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 - 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 - 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 - 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).

Kumamoto, Japan

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