Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
With the onset of September, Kokubunji's climate undergoes a slight change as the average high-temperature moves from a tropical 31.5°C (88.7°F) in August to a warm 27.2°C (81°F). Kokubunji experiences a mean low-temperature of 21.2°C (70.2°F) during September.Heat index
In September, the average heat index is calculated to be 29°C (84.2°F). Long-standing exposure coupled with ongoing activity could result in exhaustion, possibly causing heat cramps.In terms of the heat index, values are set with light wind and shade conditions in mind. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', measures the perceived warmth when incorporating the humidity present in the air. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
Humidity
In September, the average relative humidity is 72%.Rainfall
In Kokubunji, in September, it is raining for 11.4 days, with typically 42mm (1.65") of accumulated precipitation. Throughout the year, in Kokubunji, there are 113.9 rainfall days, and 334mm (13.15") of precipitation is accumulated.Snowfall
In Kokubunji, snow does not fall in April through December.Daylight
The average length of the day in September in Kokubunji is 12h and 25min.On the first day of September, sunrise is at 05:14 and sunset at 18:09. On the last day of the month, sunrise is at 05:36 and sunset at 17:27 JST.
Sunshine
In Kokubunji, the average sunshine in September is 8h.UV index
The average daily maximum UV index in September in Kokubunji is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the average person.Note: A maximum daily UV index of 5 during September morphs into the following directions:
Undertake protective steps - Recommendations to avoid sunburn are issued. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Boost your sun resistance with garments that are densely woven yet spacious.
Frequently asked questions
What are the temperatures in Kokubunji in September?
What is the average humidity in September in Kokubunji?
How many days does it rain in September in Kokubunji?
When it does not snow in Kokubunji?
What is the average length of the day in September in Kokubunji?
What time are sunrise and sunset in September in Kokubunji?
How long on average sun shines in September in Kokubunji?
What is the UV index reading in September in Kokubunji?
Average temperature in September
Kokubunji, Japan
- Average high temperature in September: 27.2°C
The warmest month (with the highest average high temperature) is August (31.5°C).
The month with the lowest average high temperature is January (8.8°C).
- Average low temperature in September: 21.2°C
The month with the highest average low temperature is August (25.2°C).
The coldest month (with the lowest average low temperature) is January (2.5°C).
Average pressure in September
Kokubunji, Japan
- Average pressure in September: 1013.5mbar
The month with the highest atmospheric pressure is November (1018.2mbar).
The month with the lowest atmospheric pressure is June (1009.2mbar).
Average wind speed in September
Kokubunji, Japan
- Average wind speed in September: 11.6km/h
The windiest month (with the highest average wind speed) is April (14.2km/h).
The calmest month (with the lowest average wind speed) is November (11.2km/h).
Average humidity in September
Kokubunji, Japan
- Average humidity in September: 72%
The month with the highest relative humidity is July (75%).
The month with the lowest relative humidity is January (58%).
Average rainfall in September
Kokubunji, Japan
- Average rainfall in September: 42mm
The wettest month (with the highest rainfall) is October (45mm).
The driest month (with the least rainfall) is February (9mm).
Average rainfall days in September
Kokubunji, Japan
- Average rainfall days in September: 11.4 days
The month with the highest number of rainy days is July (14.6 days).
The month with the least rainy days is December (4.1 days).
Average snowfall in September
Kokubunji, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (5mm).
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in September
Kokubunji, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Kokubunji, Japan
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 8h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 6h and 0min).
Average sunshine days in September
Kokubunji, Japan
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is December (25.3 days).
The month with the least sunshine days is June (13.7 days).
Average UV index in September
Kokubunji, Japan
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in September
Kokubunji, Japan
- Average cloud cover in September: 39
The months with the most cloud cover are June and October (Cloud cover 43).
The month with the least cloud cover is January (Cloud cover 27).
Average visibility in September
Kokubunji, Japan
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (10km).
The month with the lowest visibility is July (9km).
Kokubunji, Japan
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