Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September's onset introduces a mild reduction in the average high-temperature, from a moderately hot 29.1°C (84.4°F) in August to a still warm 25.8°C (78.4°F). September nights in Kosai, Japan, witness a slight temperature decrease, averaging at a pleasant 21.3°C (70.3°F).Humidity
The average relative humidity in September in Kosai is 77%.Rainfall
In Kosai, in September, it is raining for 17.1 days, with typically 99mm (3.9") of accumulated precipitation. Throughout the year, there are 163.7 rainfall days, and 1017mm (40.04") of precipitation is accumulated.Snowfall
In Kosai, snow does not fall in March through November.Sea temperature
In Kosai, Japan, in September, the average water temperature is 25.8°C (78.4°F).Note: Temperatures between 25°C (77°F) and 29°C (84.2°F) in water are ideal for swimming, diving, and other activities, providing enjoyment and comfort for extended durations.
Daylight
In September, the average length of the day in Kosai is 12h and 24min.On the first day of September, sunrise is at 05:22 and sunset at 18:16. On the last day of the month, sunrise is at 05:43 and sunset at 17:35 JST.
Sunshine
In September, the average sunshine is 8.8h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: The average daily UV index of 5 in September transforms into the following instructions:
Be vigilant - A duty to shield skin and eyes from injury exists. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Attention! UV strength is notably upped by the reflection of sand and water.
Frequently asked questions
What is the average September temperature in Kosai?
What is the average humidity in September in Kosai?
How many days does it rain in September in Kosai?
When it does not snow in Kosai?
How warm is the water in September in Kosai?
What is the average length of the day in September in Kosai?
When is the sunrise / sunset in September in Kosai?
How long on average sun shines in September in Kosai?
What is the UV index reading in September in Kosai?
Average temperature in September
Kosai, Japan
- Average high temperature in September: 25.8°C
The warmest month (with the highest average high temperature) is August (29.1°C).
The month with the lowest average high temperature is January (8.4°C).
- Average low temperature in September: 21.3°C
The month with the highest average low temperature is August (24.8°C).
The coldest month (with the lowest average low temperature) is January (3.5°C).
Average pressure in September
Kosai, Japan
- Average pressure in September: 1013mbar
The month with the highest atmospheric pressure is November (1018.7mbar).
The month with the lowest atmospheric pressure is June (1009.1mbar).
Average wind speed in September
Kosai, Japan
- Average wind speed in September: 14.7km/h
The windiest month (with the highest average wind speed) is January (24.2km/h).
The calmest months (with the lowest average wind speed) are July and August (12.8km/h).
Average humidity in September
Kosai, Japan
- Average humidity in September: 77%
The month with the highest relative humidity is July (83%).
The months with the lowest relative humidity are January and February (67%).
Average rainfall in September
Kosai, Japan
- Average rainfall in September: 99mm
The wettest month (with the highest rainfall) is July (190mm).
The driest month (with the least rainfall) is January (27mm).
Average rainfall days in September
Kosai, Japan
- Average rainfall days in September: 17.1 days
The month with the highest number of rainy days is July (20.6 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in September
Kosai, 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 and November (0mm).
Average snowfall days in September
Kosai, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.9 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Kosai, 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 month (with the lowest average sea temperature) is March (15.1°C).
Average daylight in September /
Average sunshine in September
Kosai, Japan
- Average daylight in September: 12h and 2min
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: 8h and 5min
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
Kosai, Japan
- Average sunshine days in September: 11 days
The month with the most sunshine days is January (19.9 days).
The month with the least sunshine days is July (8.7 days).
Average UV index in September
Kosai, Japan
- Average UV index in September: 5
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in September
Kosai, Japan
- Average cloud cover in September: 36
The month with the most cloud cover is June (Cloud cover 43).
The month with the least cloud cover is January (Cloud cover 28).
Average visibility in September
Kosai, 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).
Kosai, Japan
Weather forecast for your location
2. Allow the app to use your location
