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 sea temperature 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 start of September signals a gentle decrease in the average high-temperature, transitioning from a tropical 31.4°C (88.5°F) in August to a moderately hot 27.4°C (81.3°F). The average low-temperature of 21.1°C (70°F) is witnessed in Hekinan during September.Heat index
For September, the heat index is evaluated at a tropical 30°C (86°F). When exposure and activity are sustained, they could induce fatigue, with a chance of heat cramps.One should consider that heat index numbers are for shaded settings and light wind. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. An individual's perception of weather can be swayed by a variety of elements including metabolic differences, pregnancy status, and their level of physical exertion. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
Humidity
In Hekinan, the average relative humidity in September is 75%.Rainfall
In Hekinan, in September, it is raining for 15.5 days, with typically 98mm (3.86") of accumulated precipitation. Throughout the year, in Hekinan, there are 156 rainfall days, and 899mm (35.39") of precipitation is accumulated.Snowfall
March through November are months without snowfall.Sea temperature
In Hekinan, in September, the average water temperature is 25.9°C (78.6°F).Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.
Daylight
The average length of the day in September is 12h and 24min.On the first day of September in Hekinan, sunrise is at 05:24 and sunset at 18:19. On the last day of the month, sunrise is at 05:46 and sunset at 17:37 JST.
Sunshine
In September, the average sunshine in Hekinan is 8.7h.UV index
The average daily maximum UV index in September in Hekinan is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: A maximum daily UV index of 5 during September morphs into the following directions:
Undertake precautions - It is suggested to shield oneself from sunburn. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Warning! The Sun's UV rays intensify with reflections from sand and water.
Frequently asked questions
What are the temperatures in Hekinan in September?
What is the average humidity in September in Hekinan?
How many days does it rain in September in Hekinan?
When it does not snow in Hekinan?
How warm is the water in September in Hekinan?
What is the average length of the day in September in Hekinan?
When is the sunrise / sunset in September in Hekinan?
How long on average sun shines in September in Hekinan?
What is the UV index reading in September in Hekinan?
Average temperature in September
Hekinan, Japan
- Average high temperature in September: 27.4°C
The warmest month (with the highest average high temperature) is August (31.4°C).
The month with the lowest average high temperature is January (8.3°C).
- Average low temperature in September: 21.1°C
The month with the highest average low temperature is August (25°C).
The coldest month (with the lowest average low temperature) is January (2.6°C).
Average pressure in September
Hekinan, Japan
- Average pressure in September: 1013.1mbar
The month with the highest atmospheric pressure is November (1019.1mbar).
The month with the lowest atmospheric pressure is June (1009mbar).
Average wind speed in September
Hekinan, Japan
- Average wind speed in September: 10.2km/h
The windiest month (with the highest average wind speed) is January (14.3km/h).
The calmest month (with the lowest average wind speed) is July (9.1km/h).
Average humidity in September
Hekinan, Japan
- Average humidity in September: 75%
The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is February (69%).
Average rainfall in September
Hekinan, Japan
- Average rainfall in September: 98mm
The wettest month (with the highest rainfall) is July (161mm).
The driest month (with the least rainfall) is January (27mm).
Average rainfall days in September
Hekinan, Japan
- Average rainfall days in September: 15.5 days
The month with the highest number of rainy days is July (20.5 days).
The month with the least rainy days is November (8.6 days).
Average snowfall in September
Hekinan, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is January (15mm).
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Hekinan, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.7 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Hekinan, Japan
- Average sea temperature in September: 25.9°C
The best month for swimming (with the highest average sea temperature) is August (27.1°C).
The coldest months (with the lowest average sea temperature) are February and March (14.6°C).
Average daylight in September /
Average sunshine in September
Hekinan, 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 54min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 48min).
Average sunshine days in September
Hekinan, Japan
- Average sunshine days in September: 12.1 days
The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is July (7.8 days).
Average UV index in September
Hekinan, Japan
- Average UV index in September: 5
The months with the highest UV index are July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Hekinan, Japan
- Average cloud cover in September: 37
The month with the most cloud cover is July (Cloud cover 43).
The month with the least cloud cover is November (Cloud cover 31).
Average visibility in September
Hekinan, 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).
Hekinan, Japan
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