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
Irumagawa's transition into September involves a gentle shift in temperature, receding from a tropical 32°C (89.6°F) in August to a warm 27.4°C (81.3°F). An average low-temperature of 20.5°C (68.9°F) marks the nights in Irumagawa throughout September.Heat index
For September, the heat index is computed to be a tropical 30°C (86°F). Extended exposure and activity might lead to tiredness, potentially resulting in heat cramps.Remember that heat index calculations are made for conditions in the shade with light wind. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Humidity
In September, the average relative humidity in Irumagawa is 72%.Rainfall
In September, the rain falls for 14.7 days. Throughout September, 90mm (3.54") of precipitation is accumulated. Throughout the year, in Irumagawa, there are 146.2 rainfall days, and 669mm (26.34") of precipitation is accumulated.Snowfall
April through October and December are months without snowfall in Irumagawa, Japan.Daylight
The average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 05:14 and sunset at 18:10. On the last day of September, sunrise is at 05:36 and sunset at 17:27 JST.
Sunshine
The average sunshine in September is 7.7h.UV index
The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.Note: A typical high UV index of 5 in September suggests the following recommendations:
Guard yourself - An obligation to protect skin and eyes from harm exists. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Frequently asked questions
What are the temperatures in Irumagawa in September?
What is the average humidity in September in Irumagawa?
How much does it rain in Irumagawa in September?
When it does not snow in Irumagawa?
What is the average length of the day in September in Irumagawa?
When are sunrise and sunset in September in Irumagawa?
How many hours of sunshine does Irumagawa have in September?
How high is the UV index in September in Irumagawa?
Average temperature in September
Irumagawa, Japan
- Average high temperature in September: 27.4°C
The warmest month (with the highest average high temperature) is August (32°C).
The month with the lowest average high temperature is January (8.4°C).
- Average low temperature in September: 20.5°C
The month with the highest average low temperature is August (24.7°C).
The coldest month (with the lowest average low temperature) is January (1.4°C).
Average pressure in September
Irumagawa, Japan
- Average pressure in September: 1013.7mbar
The month with the highest atmospheric pressure is November (1018.4mbar).
The month with the lowest atmospheric pressure is June (1009.2mbar).
Average wind speed in September
Irumagawa, Japan
- Average wind speed in September: 9km/h
The windiest month (with the highest average wind speed) is April (11.5km/h).
The calmest month (with the lowest average wind speed) is July (8.7km/h).
Average humidity in September
Irumagawa, Japan
- Average humidity in September: 72%
The months with the highest relative humidity are June and July (73%).
The month with the lowest relative humidity is January (58%).
Average rainfall in September
Irumagawa, Japan
- Average rainfall in September: 90mm
The wettest month (with the highest rainfall) is October (102mm).
The driest month (with the least rainfall) is December (21mm).
Average rainfall days in September
Irumagawa, Japan
- Average rainfall days in September: 14.7 days
The month with the highest number of rainy days is June (18.5 days).
The month with the least rainy days is January (4.8 days).
Average snowfall in September
Irumagawa, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (39mm).
The months with the least snowfall are April, May, June, July, August, September, October and December (0mm).
Average snowfall days in September
Irumagawa, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.1 days).
The months with the least snowfall days are April, May, June, July, August, September, October and December (0 days).
Average daylight in September /
Average sunshine in September
Irumagawa, 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 4min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The months with the least sunshine are February and November (Average sunshine: 6h and 12min).
Average sunshine days in September
Irumagawa, Japan
- Average sunshine days in September: 11.7 days
The month with the most sunshine days is January (25.3 days).
The month with the least sunshine days is June (9.1 days).
Average UV index in September
Irumagawa, Japan
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in September
Irumagawa, Japan
- Average cloud cover in September: 42
The month with the most cloud cover is June (Cloud cover 45).
The month with the least cloud cover is January (Cloud cover 26).
Average visibility in September
Irumagawa, Japan
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, November and December (10km).
The months with the lowest visibility are June, July, August, September and October (9km).
Irumagawa, Japan
Weather forecast for your location
2. Allow the app to use your location
