September weather forecastShimotsui, Japan
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Shimotsui, Japan, with an average temperature fluctuating between 20.7°C (69.3°F) and 26.7°C (80.1°F).Temperature
September's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a tropical 30.7°C (87.3°F) in August to a moderately hot 26.7°C (80.1°F). Throughout September, the average low-temperature records at an agreeable 20.7°C (69.3°F).Humidity
The average relative humidity in September is 74%.Rainfall
In Shimotsui, in September, during 12.1 rainfall days, 53mm (2.09") of precipitation is typically accumulated. In Shimotsui, during the entire year, the rain falls for 133 days and collects up to 442mm (17.4") of precipitation.Snowfall
March through November are months without snowfall in Shimotsui.Daylight
In Shimotsui, the average length of the day in September is 12h and 24min.On the first day of September, sunrise is at 05:38 and sunset at 18:31. On the last day of the month, sunrise is at 05:58 and sunset at 17:50 JST.
Sunshine
In September, the average sunshine is 9.3h.UV index
In Shimotsui, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for average individuals.Note: The daily high UV index of 6 in September translates into this advice:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Shimotsui, Japan
- Average high temperature in September: 26.7°C
The warmest month (with the highest average high temperature) is August (30.7°C).
The month with the lowest average high temperature is January (8.3°C).
- Average low temperature in September: 20.7°C
The month with the highest average low temperature is August (25.1°C).
The coldest month (with the lowest average low temperature) is January (3.1°C).
Average pressure in September
Shimotsui, Japan
- Average pressure in September: 1012.6mbar
The month with the highest atmospheric pressure is January (1020.5mbar).
The month with the lowest atmospheric pressure is June (1008.5mbar).
Average wind speed in September
Shimotsui, Japan
- Average wind speed in September: 9.5km/h
The windiest months (with the highest average wind speed) are January and December (14.6km/h).
The calmest month (with the lowest average wind speed) is June (8.5km/h).
Average humidity in September
Shimotsui, Japan
- Average humidity in September: 74%
The month with the highest relative humidity is July (79%).
The months with the lowest relative humidity are March, April and May (68%).
Average rainfall in September
Shimotsui, Japan
- Average rainfall in September: 53mm
The wettest month (with the highest rainfall) is July (75mm).
The driest month (with the least rainfall) is November (13mm).
Average rainfall days in September
Shimotsui, Japan
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is July (18.5 days).
The month with the least rainy days is January (8.2 days).
Average snowfall in September
Shimotsui, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (9mm).
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Shimotsui, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.2 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Shimotsui, Japan
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 9h and 18min
The month with the most sunshine is August (Average sunshine: 11h and 0min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 6min).
Average sunshine days in September
Shimotsui, Japan
- Average sunshine days in September: 14.7 days
The month with the most sunshine days is May (20.2 days).
The month with the least sunshine days is July (9.3 days).
Average UV index in September
Shimotsui, Japan
- Average UV index in September: 6
The months with the highest UV index are July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Shimotsui, Japan
- Average cloud cover in September: 36
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Shimotsui, 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).
