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 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
Start of September brings a slight shift in the average high-temperature, dipping a bit from August's moderately hot 29.9°C (85.8°F) to a still warm 26°C (78.8°F). Throughout the month of September, the average temperature in Koya dips to a comfortable 18.5°C (65.3°F) at night.Humidity
In September, the average relative humidity in Koya is 81%.Rainfall
In September, the rain falls for 16.4 days. Throughout September, 116mm (4.57") of precipitation is accumulated. Throughout the year, there are 199.5 rainfall days, and 1277mm (50.28") of precipitation is accumulated.Snowfall
In Koya, Japan, snow does not fall in May through November.Daylight
In September, the average length of the day is 12h and 24min.On the first day of the month, sunrise is at 05:31 and sunset at 18:24. On the last day of September, in Koya, sunrise is at 05:51 and sunset at 17:43 JST.
Sunshine
In Koya, the average sunshine in September is 8.8h.UV index
The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: During September, 5 as the daily maximum UV index converts into the following advice:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Frequently asked questions
What are the temperatures in Koya in September?
What is the average humidity in September in Koya?
How much does it rain in Koya in September?
When it does not snow in Koya?
How many hours of daylight does Koya have in September?
What time are sunrise and sunset in September in Koya?
How long on average sun shines in September in Koya?
How high is the UV index in September in Koya?
Average temperature in September
Koya, Japan
- Average high temperature in September: 26°C
The warmest month (with the highest average high temperature) is August (29.9°C).
The month with the lowest average high temperature is January (6.7°C).
- Average low temperature in September: 18.5°C
The month with the highest average low temperature is August (22.3°C).
The coldest month (with the lowest average low temperature) is January (0.1°C).
Average pressure in September
Koya, Japan
- Average pressure in September: 1012.6mbar
The month with the highest atmospheric pressure is February (1019.5mbar).
The month with the lowest atmospheric pressure is June (1008.8mbar).
Average wind speed in September
Koya, Japan
- Average wind speed in September: 6.3km/h
The windiest month (with the highest average wind speed) is January (9.5km/h).
The calmest months (with the lowest average wind speed) are June and August (6.2km/h).
Average humidity in September
Koya, Japan
- Average humidity in September: 81%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is May (74%).
Average rainfall in September
Koya, Japan
- Average rainfall in September: 116mm
The wettest month (with the highest rainfall) is July (179mm).
The driest month (with the least rainfall) is January (56mm).
Average rainfall days in September
Koya, Japan
- Average rainfall days in September: 16.4 days
The month with the highest number of rainy days is July (21.1 days).
The month with the least rainy days is February (13.8 days).
Average snowfall in September
Koya, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is January (90mm).
The months with the least snowfall are May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Koya, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.1 days).
The months with the least snowfall days are May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Koya, 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 42min).
The months with the least sunshine are January and February (Average sunshine: 5h and 12min).
Average sunshine days in September
Koya, Japan
- Average sunshine days in September: 11.3 days
The month with the most sunshine days is May (14.3 days).
The month with the least sunshine days is July (7.9 days).
Average UV index in September
Koya, 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, February and December (UV index 2).
Average cloud cover in September
Koya, Japan
- Average cloud cover in September: 38
The month with the most cloud cover is January (Cloud cover 46).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Koya, 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).
Koya, Japan
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