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
Hachioji's September weather shows a modest shift in high-temperatures, falling from August's hot 31.9°C (89.4°F) to a moderately hot 27.5°C (81.5°F). In the month of September, the average temperature dips to an agreeable 20.9°C (69.6°F) during the night.Heat index
The heat index value during September is calculated to be a hot 30°C (86°F). With extended exposure and activity, one might feel exhausted and experience heat cramps.Take note of the fact that heat index values are based on shaded circumstances with light airflows. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'real feel' or 'feels like', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are of high significance for children. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
Humidity
In Hachioji, the average relative humidity in September is 73%.Rainfall
In September, in Hachioji, the rain falls for 14 days. Throughout September, 74mm (2.91") of precipitation is accumulated. In Hachioji, Japan, during the entire year, the rain falls for 138 days and collects up to 580mm (22.83") of precipitation.Snowfall
April through October and December are months without snowfall.Daylight
The average length of the day in September is 12h and 25min.On the first day of September in Hachioji, sunrise is at 05:14 and sunset at 18:10. On the last day of the month, sunrise is at 05:36 and sunset at 17:28 JST.
Sunshine
In September, the average sunshine is 7.8h.UV index
In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the average person.Note: In September, the maximum UV index of 6 translates into these guidelines:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Frequently asked questions
What is the temperature in September in Hachioji?
What is the average humidity in September in Hachioji?
How many days does it rain in September in Hachioji?
When it does not snow in Hachioji?
What is the average length of the day in September in Hachioji?
When is the sunrise / sunset in September in Hachioji?
How many hours of sunshine does Hachioji have in September?
How high is the UV index in September in Hachioji?
Average temperature in September
Hachioji, Japan
- Average high temperature in September: 27.5°C
The warmest month (with the highest average high temperature) is August (31.9°C).
The month with the lowest average high temperature is January (8.5°C).
- Average low temperature in September: 20.9°C
The month with the highest average low temperature is August (24.9°C).
The coldest month (with the lowest average low temperature) is January (2°C).
Average pressure in September
Hachioji, Japan
- Average pressure in September: 1013.6mbar
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
Hachioji, Japan
- Average wind speed in September: 10km/h
The windiest month (with the highest average wind speed) is April (12.6km/h).
The calmest month (with the lowest average wind speed) is November (9.7km/h).
Average humidity in September
Hachioji, Japan
- Average humidity in September: 73%
The month with the highest relative humidity is July (75%).
The month with the lowest relative humidity is January (59%).
Average rainfall in September
Hachioji, Japan
- Average rainfall in September: 74mm
The wettest month (with the highest rainfall) is October (79mm).
The driest month (with the least rainfall) is December (19mm).
Average rainfall days in September
Hachioji, Japan
- Average rainfall days in September: 14 days
The month with the highest number of rainy days is June (15.7 days).
The month with the least rainy days is January (4.1 days).
Average snowfall in September
Hachioji, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (33mm).
The months with the least snowfall are April, May, June, July, August, September, October and December (0mm).
Average snowfall days in September
Hachioji, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.8 days).
The months with the least snowfall days are April, May, June, July, August, September, October and December (0 days).
Average daylight in September /
Average sunshine in September
Hachioji, 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: 7h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 6h and 0min).
Average sunshine days in September
Hachioji, Japan
- Average sunshine days in September: 12.6 days
The month with the most sunshine days is January (26 days).
The month with the least sunshine days is June (11.9 days).
Average UV index in September
Hachioji, Japan
- Average UV index in September: 6
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
Hachioji, Japan
- Average cloud cover in September: 41
The months with the most cloud cover are June and October (Cloud cover 44).
The month with the least cloud cover is January (Cloud cover 26).
Average visibility in September
Hachioji, Japan
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, August, October, November and December (10km).
The months with the lowest visibility are June, July and September (9km).
Hachioji, Japan
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