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
With September's onset, the weather reveals a slight temperature decrease, transitioning from a hot 31.5°C (88.7°F) in August to a moderately hot 27.8°C (82°F). During September, Yanagawa's temperature averages to a pleasant 20.5°C (68.9°F) at night.Heat index
In September, the heat index is computed to be a tropical 31°C (87.8°F). Unrelenting activity during exposure could cause fatigue and potentially lead to heat cramps.Research indicates the heat index considers values in shaded locales and with light winds. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. It is noteworthy that being in direct sunlight can enhance the weather's impact, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
Humidity
The average relative humidity in September is 77%.Rainfall
In September, the rain falls for 15 days. Throughout September, 76mm (2.99") of precipitation is accumulated. In Yanagawa, during the entire year, the rain falls for 177 days and collects up to 1065mm (41.93") of precipitation.Snowfall
April through November are months without snowfall.Daylight
In Yanagawa, the average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 05:52 and sunset at 18:43. On the last day of September, sunrise is at 06:12 and sunset at 18:04 JST.
Sunshine
In September, the average sunshine is 8.6h.UV index
In Yanagawa, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: In September, an average UV index of 5 transforms into the following instructions:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. To guard against the harmful effects of the Sun, minimize exposure during midday. Stay sun-safe with clothing that is both closely woven and worn loosely.
Frequently asked questions
What are the temperatures in Yanagawa in September?
What is the average humidity in September in Yanagawa?
How many days does it rain in September in Yanagawa?
When it does not snow in Yanagawa?
How many hours of daylight does Yanagawa have in September?
When are sunrise and sunset in September in Yanagawa?
How many hours of sunshine does Yanagawa have in September?
What is the UV index intensity in September in Yanagawa?
Average temperature in September
Yanagawa, Japan
- Average high temperature in September: 27.8°C
The warmest month (with the highest average high temperature) is August (31.5°C).
The month with the lowest average high temperature is January (9.2°C).
- Average low temperature in September: 20.5°C
The month with the highest average low temperature is August (24.5°C).
The coldest month (with the lowest average low temperature) is January (3.6°C).
Average pressure in September
Yanagawa, Japan
- Average pressure in September: 1012mbar
The month with the highest atmospheric pressure is January (1022mbar).
The month with the lowest atmospheric pressure is June (1008.2mbar).
Average wind speed in September
Yanagawa, Japan
- Average wind speed in September: 8.5km/h
The windiest month (with the highest average wind speed) is March (10km/h).
The calmest month (with the lowest average wind speed) is June (7.6km/h).
Average humidity in September
Yanagawa, Japan
- Average humidity in September: 77%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is March (71%).
Average rainfall in September
Yanagawa, Japan
- Average rainfall in September: 76mm
The wettest month (with the highest rainfall) is July (204mm).
The driest month (with the least rainfall) is January (43mm).
Average rainfall days in September
Yanagawa, Japan
- Average rainfall days in September: 15 days
The month with the highest number of rainy days is July (22 days).
The month with the least rainy days is October (10.4 days).
Average snowfall in September
Yanagawa, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is January (21mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Yanagawa, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.9 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
Yanagawa, Japan
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in September
Yanagawa, Japan
- Average sunshine days in September: 13.1 days
The month with the most sunshine days is October (18.3 days).
The month with the least sunshine days is July (6.8 days).
Average UV index in September
Yanagawa, 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
Yanagawa, Japan
- Average cloud cover in September: 37
The month with the most cloud cover is June (Cloud cover 48).
The month with the least cloud cover is October (Cloud cover 31).
Average visibility in September
Yanagawa, Japan
- Average visibility in September: 9km
The months with the highest visibility are October and November (10km).
The months with the lowest visibility are June and July (8km).
Yanagawa, Japan
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