September weather forecastNishio, Japan
September
Weather in September
The first month of the autumn, September, is still a warm month in Nishio, Japan, with an average temperature varying between 21.4°C (70.5°F) and 27.2°C (81°F).Temperature
September's onset brings a negligible change in high-temperatures, falling from a tropical 31°C (87.8°F) in August to a moderately hot 27.2°C (81°F). In Nishio, September nights cool down to an average of 21.4°C (70.5°F).Heat index
The heat index for September is calculated to be a hot 30°C (86°F). Continued exposure and engagement in activity might trigger tiredness and subsequently heat cramps.Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is found by incorporating humidity levels into the air temperature measurement. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. It is noteworthy that being in direct sunlight can enhance the weather's impact, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
Humidity
In September, the average relative humidity in Nishio is 75%.Rainfall
In Nishio, during September, the rain falls for 14.8 days and regularly aggregates up to 47mm (1.85") of precipitation. Throughout the year, there are 128.7 rainfall days, and 478mm (18.82") of precipitation is accumulated.Snowfall
March through December are months without snowfall.Sea temperature
In Nishio, the average seawater temperature in September is 25.8°C (78.4°F).Note: Ideal surface water temperatures for any water activity fall between 25°C (77°F) and 29°C (84.2°F), offering maximum enjoyment for lengthened periods.
Daylight
In September, the average length of the day is 12h and 24min.On the first day of September in Nishio, sunrise is at 05:24 and sunset at 18:18. On the last day of the month, sunrise is at 05:45 and sunset at 17:37 JST.
Sunshine
The average sunshine in September in Nishio, Japan, is 8.8h.UV index
In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum UV index of 5 during September translates into these guidelines:
Take necessary precautions - Defending against sun damage is advocated. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Nishio, Japan
- Average high temperature in September: 27.2°C
The warmest month (with the highest average high temperature) is August (31°C).
The month with the lowest average high temperature is January (8.2°C).
- Average low temperature in September: 21.4°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 (2.9°C).
Average pressure in September
Nishio, Japan
- Average pressure in September: 1013mbar
The month with the highest atmospheric pressure is November (1019mbar).
The month with the lowest atmospheric pressure is June (1009.1mbar).
Average wind speed in September
Nishio, Japan
- Average wind speed in September: 11.2km/h
The windiest month (with the highest average wind speed) is January (16.5km/h).
The calmest month (with the lowest average wind speed) is July (10km/h).
Average humidity in September
Nishio, Japan
- Average humidity in September: 75%
The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is February (68%).
Average rainfall in September
Nishio, Japan
- Average rainfall in September: 47mm
The wettest month (with the highest rainfall) is July (80mm).
The driest month (with the least rainfall) is January (13mm).
Average rainfall days in September
Nishio, Japan
- Average rainfall days in September: 14.8 days
The month with the highest number of rainy days is July (16.2 days).
The month with the least rainy days is January (5.4 days).
Average snowfall in September
Nishio, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (2mm).
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in September
Nishio, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.5 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Nishio, Japan
- Average sea temperature in September: 25.8°C
The best month for swimming (with the highest average sea temperature) is August (26.8°C).
The coldest months (with the lowest average sea temperature) are February and March (14.8°C).
Average daylight in September /
Average sunshine in September
Nishio, 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 54min).
- Average sunshine in September: 8h and 48min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 54min).
Average sunshine days in September
Nishio, Japan
- Average sunshine days in September: 13.1 days
The month with the most sunshine days is January (24.7 days).
The month with the least sunshine days is August (12.7 days).
Average UV index in September
Nishio, Japan
- Average UV index in September: 5
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
Nishio, Japan
- Average cloud cover in September: 36
The months with the most cloud cover are June and July (Cloud cover 41).
The months with the least cloud cover are January and November (Cloud cover 30).
Average visibility in September
Nishio, Japan
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, August, September, October, November and December (10km).
The months with the lowest visibility are May, June and July (9km).
