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
In September, the average high-temperature marginally decreases from a moderately hot 29.8°C (85.6°F) in August to a still warm 26.5°C (79.7°F). Night temperatures in September in Keihinjima exhibit a subtle decrease, settling at an average of 21.6°C (70.9°F).Humidity
In September, the average relative humidity is 76%.Rainfall
In Keihinjima, in September, it is raining for 14 days, with typically 87mm (3.43") of accumulated precipitation. Throughout the year, there are 154.1 rainfall days, and 754mm (29.69") of precipitation is accumulated.Snowfall
In Keihinjima, snow does not fall in April through December.Daylight
In Keihinjima, the average length of the day in September is 12h and 25min.On the first day of September in Keihinjima, sunrise is at 05:13 and sunset at 18:08. On the last day of the month, sunrise is at 05:35 and sunset at 17:26 JST.
Sunshine
The average sunshine in September in Keihinjima is 7.9h.UV index
The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 6 during September translates into the following directions:
Prevent overexposure. Protection from the sun's harmful effects is needed. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Frequently asked questions
What are September temperatures in Keihinjima?
What is the average humidity in September in Keihinjima?
How much does it rain in Keihinjima in September?
When it does not snow in Keihinjima?
How many hours of daylight does Keihinjima have in September?
When are sunrise and sunset in September in Keihinjima?
How many hours of sunshine does Keihinjima have in September?
What is the UV index reading in September in Keihinjima?
Average temperature in September
Keihinjima, Japan
- Average high temperature in September: 26.5°C
The warmest month (with the highest average high temperature) is August (29.8°C).
The month with the lowest average high temperature is January (8.9°C).
- Average low temperature in September: 21.6°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 (3.4°C).
Average pressure in September
Keihinjima, Japan
- Average pressure in September: 1013.4mbar
The month with the highest atmospheric pressure is November (1018mbar).
The month with the lowest atmospheric pressure is June (1009.2mbar).
Average wind speed in September
Keihinjima, Japan
- Average wind speed in September: 13.9km/h
The windiest month (with the highest average wind speed) is April (17.3km/h).
The calmest month (with the lowest average wind speed) is June (13.6km/h).
Average humidity in September
Keihinjima, Japan
- Average humidity in September: 76%
The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is January (61%).
Average rainfall in September
Keihinjima, Japan
- Average rainfall in September: 87mm
The wettest month (with the highest rainfall) is October (100mm).
The driest month (with the least rainfall) is December (36mm).
Average rainfall days in September
Keihinjima, Japan
- Average rainfall days in September: 14 days
The month with the highest number of rainy days is June (16 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in September
Keihinjima, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (37mm).
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in September
Keihinjima, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Keihinjima, 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 18min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).
Average sunshine days in September
Keihinjima, Japan
- Average sunshine days in September: 13.6 days
The month with the most sunshine days is January (20.9 days).
The month with the least sunshine days is June (12.3 days).
Average UV index in September
Keihinjima, Japan
- Average UV index in September: 6
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 3).
Average cloud cover in September
Keihinjima, Japan
- Average cloud cover in September: 39
The months with the most cloud cover are June and October (Cloud cover 45).
The month with the least cloud cover is January (Cloud cover 31).
Average visibility in September
Keihinjima, Japan
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Keihinjima, Japan
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