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
The shift from August to September includes a minor decrease in the average high-temperature, lightly dropping from a warm 29.8°C (85.6°F) to a still moderately hot 26.5°C (79.7°F). In Katsushima, a slight decrease from the daytime peak is noted during the month of September, with an average low-temperature of 21.6°C (70.9°F).Humidity
In Katsushima, the average relative humidity in September is 76%.Rainfall
In Katsushima, in September, during 14 rainfall days, 87mm (3.43") of precipitation is typically accumulated. Throughout the year, there are 154.1 rainfall days, and 754mm (29.69") of precipitation is accumulated.Snowfall
In Katsushima, snow does not fall in April through December.Daylight
The average length of the day in September in Katsushima is 12h and 25min.On the first day of the month, sunrise is at 05:13 and sunset at 18:08. On the last day of September, sunrise is at 05:35 and sunset at 17:26 JST.
Sunshine
In September, the average sunshine is 7.9h.UV index
The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the average person.Note: A daily maximum UV index of 6 in September translates into the following instructions:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Frequently asked questions
What are September temperatures in Katsushima?
What is the average humidity in September in Katsushima?
How many days does it rain in September in Katsushima?
When it does not snow in Katsushima?
What is the average length of the day in September in Katsushima?
When are sunrise and sunset in September in Katsushima?
How many hours of sunshine does Katsushima have in September?
How high is the UV index in September in Katsushima?
Average temperature in September
Katsushima, Japan
- Average high temperature in September: 26.5°C
The warmest month (with the highest average high temperature) is August (29.8°C).
The month with the lowest average high temperature is January (8.9°C).
- Average low temperature in September: 21.6°C
The month with the highest average low temperature is August (24.9°C).
The coldest month (with the lowest average low temperature) is January (3.4°C).
Average pressure in September
Katsushima, Japan
- Average pressure in September: 1013.4mbar
The month with the highest atmospheric pressure is November (1018mbar).
The month with the lowest atmospheric pressure is June (1009.2mbar).
Average wind speed in September
Katsushima, Japan
- Average wind speed in September: 13.9km/h
The windiest month (with the highest average wind speed) is April (17.3km/h).
The calmest month (with the lowest average wind speed) is June (13.6km/h).
Average humidity in September
Katsushima, Japan
- Average humidity in September: 76%
The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is January (61%).
Average rainfall in September
Katsushima, Japan
- Average rainfall in September: 87mm
The wettest month (with the highest rainfall) is October (100mm).
The driest month (with the least rainfall) is December (36mm).
Average rainfall days in September
Katsushima, Japan
- Average rainfall days in September: 14 days
The month with the highest number of rainy days is June (16 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in September
Katsushima, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (37mm).
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in September
Katsushima, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Katsushima, Japan
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 7h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).
Average sunshine days in September
Katsushima, Japan
- Average sunshine days in September: 13.6 days
The month with the most sunshine days is January (20.9 days).
The month with the least sunshine days is June (12.3 days).
Average UV index in September
Katsushima, Japan
- Average UV index in September: 6
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 3).
Average cloud cover in September
Katsushima, Japan
- Average cloud cover in September: 39
The months with the most cloud cover are June and October (Cloud cover 45).
The month with the least cloud cover is January (Cloud cover 31).
Average visibility in September
Katsushima, 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).
Katsushima, Japan
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