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
As September commences, the average high-temperature subtly reduces, transitioning from a warm 29.1°C (84.4°F) in August to a still moderately hot 25.8°C (78.4°F). Yanai, during the nights of September, averages a temperature close to its daytime high, at a pleasant 20.8°C (69.4°F).Humidity
In Yanai, the average relative humidity in September is 79%.Rainfall
In Yanai, in September, it is raining for 15 days, with typically 100mm (3.94") of accumulated precipitation. In Yanai, during the entire year, the rain falls for 168 days and collects up to 1163mm (45.79") of precipitation.Snowfall
March through November are months without snowfall in Yanai.Sea temperature
In Yanai, in September, the average water temperature is 25.7°C (78.3°F).Note: For swimming, diving, and various water activities, the temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as highly enjoyable and comfortable for extended durations without any discomfort.
Daylight
The average length of the day in September in Yanai, Japan, is 12h and 23min.On the first day of the month, sunrise is at 05:45 and sunset at 18:37. On the last day of September, in Yanai, sunrise is at 06:05 and sunset at 17:57 JST.
Sunshine
In September, the average sunshine is 9.1h.UV index
The average daily maximum UV index in September in Yanai 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 average person.Note: The maximum UV index of 5 during September leads to these instructions:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Warning! The Sun's UV rays intensify with reflections from sand and water.
Frequently asked questions
What are September temperatures in Yanai?
What is the average humidity in September in Yanai?
How many days does it rain in September in Yanai?
When it does not snow in Yanai?
How warm is the water in September in Yanai?
How many hours of daylight does Yanai have in September?
What time are sunrise and sunset in September in Yanai?
How many hours of sunshine does Yanai have in September?
What is the UV index reading in September in Yanai?
Average temperature in September
Yanai, 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 (8.7°C).
- Average low temperature in September: 20.8°C
The month with the highest average low temperature is August (24.3°C).
The coldest month (with the lowest average low temperature) is January (4.3°C).
Average pressure in September
Yanai, Japan
- Average pressure in September: 1012.5mbar
The month with the highest atmospheric pressure is January (1021.3mbar).
The month with the lowest atmospheric pressure is June (1008.4mbar).
Average wind speed in September
Yanai, Japan
- Average wind speed in September: 9.4km/h
The windiest month (with the highest average wind speed) is January (14.5km/h).
The calmest month (with the lowest average wind speed) is June (8km/h).
Average humidity in September
Yanai, Japan
- Average humidity in September: 79%
The month with the highest relative humidity is July (85%).
The months with the lowest relative humidity are January, February and March (71%).
Average rainfall in September
Yanai, Japan
- Average rainfall in September: 100mm
The wettest month (with the highest rainfall) is July (213mm).
The driest month (with the least rainfall) is January (39mm).
Average rainfall days in September
Yanai, Japan
- Average rainfall days in September: 15 days
The month with the highest number of rainy days is July (20.5 days).
The month with the least rainy days is October (10.5 days).
Average snowfall in September
Yanai, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is December (8mm).
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Yanai, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.3 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
Yanai, Japan
- Average sea temperature in September: 25.7°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 February (12.9°C).
Average daylight in September /
Average sunshine in September
Yanai, 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: 9h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).
Average sunshine days in September
Yanai, Japan
- Average sunshine days in September: 13 days
The month with the most sunshine days is May (18.6 days).
The month with the least sunshine days is July (9.3 days).
Average UV index in September
Yanai, 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
Yanai, Japan
- Average cloud cover in September: 36
The months with the most cloud cover are January and June (Cloud cover 43).
The months with the least cloud cover are August, October and November (Cloud cover 32).
Average visibility in September
Yanai, Japan
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, August, September, October, November and December (10km).
The months with the lowest visibility are April, May, June and July (9km).
Yanai, Japan
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