September weather forecastAisai, Japan
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Aisai, Japan, with an average temperature varying between 19.5°C (67.1°F) and 27°C (80.6°F).Temperature
A modest decline in the average high-temperature is seen during September, decreasing from a hot 31.5°C (88.7°F) in August to a moderately hot 27°C (80.6°F). During September, the nighttime temperature in Aisai averages of 19.5°C (67.1°F).Heat index
The average heat index in September is appraised at 29°C (84.2°F). If activity and exposure persist, they could induce fatigue, leading to possible heat cramps.The standards for the heat index are set for locations in shade and under light breezes. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', offers an insight into how hot it feels when we factor in moisture content. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
Humidity
In September, the average relative humidity in Aisai is 77%.Rainfall
In Aisai, during September, the rain falls for 15.2 days and regularly aggregates up to 105mm (4.13") of precipitation. In Aisai, during the entire year, the rain falls for 157.2 days and collects up to 936mm (36.85") of precipitation.Snowfall
April through November are months without snowfall in Aisai, Japan.Daylight
The average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 05:25 and sunset at 18:20. On the last day of September, sunrise is at 05:47 and sunset at 17:38 JST.
Sunshine
The average sunshine in September in Aisai, Japan, is 8.5h.UV index
The average daily maximum UV index in September in Aisai, Japan, is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, a regular UV index of 5 translates into these guidelines:
Exercise caution. Those with pale skin may experience burns in less than half an hour. The Sun's radiation is especially intense around midday; try to stay in shade during this period. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Aisai, Japan
- Average high temperature in September: 27°C
The warmest month (with the highest average high temperature) is August (31.5°C).
The month with the lowest average high temperature is January (6.8°C).
- Average low temperature in September: 19.5°C
The month with the highest average low temperature is August (23.8°C).
The coldest month (with the lowest average low temperature) is January (0.7°C).
Average pressure in September
Aisai, Japan
- Average pressure in September: 1013.2mbar
The month with the highest atmospheric pressure is November (1019.3mbar).
The month with the lowest atmospheric pressure is June (1009mbar).
Average wind speed in September
Aisai, Japan
- Average wind speed in September: 7.4km/h
The windiest months (with the highest average wind speed) are February and March (9.5km/h).
The calmest month (with the lowest average wind speed) is July (7km/h).
Average humidity in September
Aisai, Japan
- Average humidity in September: 77%
The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is May (71%).
Average rainfall in September
Aisai, Japan
- Average rainfall in September: 105mm
The wettest month (with the highest rainfall) is July (174mm).
The driest month (with the least rainfall) is January (21mm).
Average rainfall days in September
Aisai, Japan
- Average rainfall days in September: 15.2 days
The month with the highest number of rainy days is July (21.8 days).
The month with the least rainy days is January (7.7 days).
Average snowfall in September
Aisai, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (8mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Aisai, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.7 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
Aisai, 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: 8h and 30min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 5h and 42min).
Average sunshine days in September
Aisai, Japan
- Average sunshine days in September: 12.5 days
The month with the most sunshine days is January (20.3 days).
The month with the least sunshine days is July (7.1 days).
Average UV index in September
Aisai, Japan
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Aisai, Japan
- Average cloud cover in September: 39
The month with the most cloud cover is July (Cloud cover 48).
The month with the least cloud cover is November (Cloud cover 32).
Average visibility in September
Aisai, Japan
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, August, September, October, November and December (9km).
The months with the lowest visibility are June and July (8km).
