September weather forecastJonanjima, Japan
September
Weather in September
September, the first month of the autumn in Jonanjima, is also a moderately hot month, with temperature in the range of an average low of 21.6°C (70.9°F) and an average high of 26.5°C (79.7°F).Temperature
The start of September signals a gentle decrease in the average high-temperature, transitioning from 29.8°C (85.6°F) in August to a still moderately hot 26.5°C (79.7°F). Jonanjima's nighttime average temperature in September subtly descends to an agreeable 21.6°C (70.9°F) from the daily highs.Humidity
In September, the average relative humidity is 76%.Rainfall
In Jonanjima, in September, during 14 rainfall days, 87mm (3.43") of precipitation is typically accumulated. Throughout the year, there are 154.1 rainfall days, and 754mm (29.69") of precipitation is accumulated.Snowfall
April through December are months without snowfall in Jonanjima, Japan.Daylight
In Jonanjima, Japan, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 05:13 and sunset at 18:08. On the last day of September, in Jonanjima, Japan, sunrise is at 05:35 and sunset at 17:26 JST.
Sunshine
In Jonanjima, the average sunshine in September is 7.9h.UV index
The average daily maximum UV index in September in Jonanjima, Japan, is 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the average person.Note: In September, the maximum UV index of 6 transforms into these recommendations:
Prevent overexposure. Protection from the sun's harmful effects is needed. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Jonanjima, 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
Jonanjima, 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
Jonanjima, 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
Jonanjima, 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
Jonanjima, 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
Jonanjima, 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
Jonanjima, 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
Jonanjima, 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
Jonanjima, Japan
- Average daylight in September: 12h and 24min
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 54min
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
Jonanjima, 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
Jonanjima, 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
Jonanjima, 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
Jonanjima, 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).
