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
September
Weather in September
Temperature
The shift from August to September involves a decrease in the average high-temperature, from a tropical 31.8°C (89.2°F) to a moderately hot 26.6°C (79.9°F). Koga, in September, observes a steady average low-temperature of 19.6°C (67.3°F).Humidity
The average relative humidity in September is 74%.Rainfall
In Koga, during September, the rain falls for 17.1 days and regularly aggregates up to 101mm (3.98") of precipitation. Throughout the year, there are 165.6 rainfall days, and 838mm (32.99") of precipitation is accumulated.Snowfall
In Koga, snow does not fall in April through October.Daylight
The average length of the day in September is 12h and 25min.On the first day of September, sunrise is at 05:12 and sunset at 18:09. On the last day of the month, sunrise is at 05:35 and sunset at 17:26 JST.
Sunshine
The average sunshine in September is 7.9h.UV index
The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum UV index, 5 during September, leads to the following recommendations:
Exercise care. People with light skin might get burns in fewer than 30 minutes. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Koga have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Koga, Japan
- Average high temperature in September: 26.6°C
The warmest month (with the highest average high temperature) is August (31.8°C).
The month with the lowest average high temperature is January (7.6°C).
- Average low temperature in September: 19.6°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 (0.8°C).
Average pressure in September
Koga, Japan
- Average pressure in September: 1013.8mbar
The month with the highest atmospheric pressure is November (1018.4mbar).
The month with the lowest atmospheric pressure is June (1009.3mbar).
Average wind speed in September
Koga, Japan
- Average wind speed in September: 8.1km/h
The windiest month (with the highest average wind speed) is April (10.2km/h).
The calmest month (with the lowest average wind speed) is November (7.6km/h).
Average humidity in September
Koga, Japan
- Average humidity in September: 74%
The month with the highest relative humidity is July (76%).
The month with the lowest relative humidity is January (60%).
Average rainfall in September
Koga, Japan
- Average rainfall in September: 101mm
The wettest month (with the highest rainfall) is October (120mm).
The driest month (with the least rainfall) is December (27mm).
Average rainfall days in September
Koga, Japan
- Average rainfall days in September: 17.1 days
The month with the highest number of rainy days is July (22.1 days).
The month with the least rainy days is January (5.6 days).
Average snowfall in September
Koga, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (38mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Koga, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Koga, Japan
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 7h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 0min).
The months with the least sunshine are February and November (Average sunshine: 6h and 12min).
Average sunshine days in September
Koga, Japan
- Average sunshine days in September: 9.9 days
The month with the most sunshine days is January (23.8 days).
The month with the least sunshine days is July (5.8 days).
Average UV index in September
Koga, 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
Koga, Japan
- Average cloud cover in September: 41
The month with the most cloud cover is June (Cloud cover 46).
The month with the least cloud cover is January (Cloud cover 25).
Average visibility in September
Koga, Japan
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, November and December (10km).
The months with the lowest visibility are April, May, June, July, August, September and October (9km).
