September weather forecastChatan, Japan
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Chatan, Japan, with an average temperature fluctuating between 28.6°C (83.5°F) and 27.4°C (81.3°F).Temperature
The high-temperature average in September for Chatan is a still moderately hot 28.6°C (83.5°F), staying closely aligned with August's conditions. Chatan reports an average low temperature of 27.4°C (81.3°F) in September, a minor decrease from the day's highs.Heat index
The heat index value for September is appraised at a tropical 33°C (91.4°F). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.Heat index determinations are made taking into account the shade and light air movements. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', evaluates the perceived heat by adding the effect of moisture in the air. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
Humidity
The average relative humidity in September in Chatan is 79%.Rainfall
In Chatan, during September, the rain falls for 19.1 days and regularly aggregates up to 114mm (4.49") of precipitation. In Chatan, during the entire year, the rain falls for 215.5 days and collects up to 1300mm (51.18") of precipitation.Sea temperature
In September, the average sea temperature in Chatan is 28.3°C (82.9°F).Note: Water temperatures between 25°C (77°F) and 29°C (84.2°F) are regarded as very warm, ensuring all water activities are pleasurable for extended periods without feeling uneasy.
Daylight
In Chatan, the average length of the day in September is 12h and 19min.On the first day of the month, sunrise is at 06:08 and sunset at 18:48. On the last day of September, sunrise is at 06:20 and sunset at 18:16 JST.
Sunshine
In September, the average sunshine in Chatan is 8.6h.UV index
The months with the highest UV index in Chatan are June through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for ordinary individuals.Note: A typical high UV index of 7 in September suggests the following recommendations:
Guard oneself from overexposure. Defence against sun injury is vital. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Caution! Sand and water reflections can notably increase the UV radiation intensity.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chatan, Japan
- Average high temperature in September: 28.6°C
The warmest month (with the highest average high temperature) is August (29.5°C).
The month with the lowest average high temperature is January (18.8°C).
- Average low temperature in September: 27.4°C
The month with the highest average low temperature is August (28.2°C).
The coldest month (with the lowest average low temperature) is January (16.8°C).
Average pressure in September
Chatan, Japan
- Average pressure in September: 1009.1mbar
The month with the highest atmospheric pressure is January (1020.9mbar).
The month with the lowest atmospheric pressure is August (1006.6mbar).
Average wind speed in September
Chatan, Japan
- Average wind speed in September: 22.6km/h
The windiest month (with the highest average wind speed) is December (27.6km/h).
The calmest month (with the lowest average wind speed) is May (19.5km/h).
Average humidity in September
Chatan, Japan
- Average humidity in September: 79%
The month with the highest relative humidity is June (86%).
The month with the lowest relative humidity is January (72%).
Average rainfall in September
Chatan, Japan
- Average rainfall in September: 114mm
The wettest month (with the highest rainfall) is June (198mm).
The driest months (with the least rainfall) are January and February (53mm).
Average rainfall days in September
Chatan, Japan
- Average rainfall days in September: 19.1 days
The month with the highest number of rainy days is October (19.7 days).
The month with the least rainy days is July (16.1 days).
Average sea temperature in September
Chatan, Japan
- Average sea temperature in September: 28.3°C
The best month for swimming (with the highest average sea temperature) is August (28.7°C).
The coldest month (with the lowest average sea temperature) is February (20.9°C).
Average daylight in September /
Average sunshine in September
Chatan, Japan
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in September
Chatan, Japan
- Average sunshine days in September: 7.1 days
The month with the most sunshine days is July (12.6 days).
The month with the least sunshine days is September (7.1 days).
Average UV index in September
Chatan, Japan
- Average UV index in September: 7
The months with the highest UV index are June, July, August and September (UV index 7).
The month with the lowest UV index is December (UV index 4).
Average cloud cover in September
Chatan, Japan
- Average cloud cover in September: 36
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in September
Chatan, 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).
