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
September's arrival subtly correlates with a reduction in the average high-temperature, down from a hot 30.8°C (87.4°F) in August to a moderately hot 27.7°C (81.9°F). Rui'an observes an average low-temperature of 21.8°C (71.2°F) during September.Heat index
The heat index for September is evaluated at a tropical 32°C (89.6°F). Exposure and extended activity could potentially cause a state of fatigue and lead to heat cramps.It is crucial to understand that heat index figures are for shade and gentle wind conditions. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', arises from combining readings of air temperature and relative moisture content. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
Humidity
In September, the average relative humidity is 82%.Rainfall
In September, the rain falls for 16.8 days. Throughout September, 52mm (2.05") of precipitation is accumulated. Throughout the year, there are 173.8 rainfall days, and 587mm (23.11") of precipitation is accumulated.Snowfall
In Rui'an, snow does not fall in February through December.Daylight
The average length of the day in September in Rui'an, China, is 12h and 20min.On the first day of the month, sunrise is at 05:36 and sunset at 18:18. On the last day of September, sunrise is at 05:49 and sunset at 17:44 CST.
Sunshine
In Rui'an, the average sunshine in September is 8.2h.UV index
In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A maximum high UV index of 5 in September translates into the following recommendations:
Undertake precautions - Obligation exists to protect against skin and eye damage. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Rui'an in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Rui'an have in September?
How high is the UV index in September?
Average temperature in September
Rui'an, China
- Average high temperature in September: 27.7°C
The warmest month (with the highest average high temperature) is August (30.8°C).
The month with the lowest average high temperature is January (11.6°C).
- Average low temperature in September: 21.8°C
The month with the highest average low temperature is July (24.6°C).
The coldest month (with the lowest average low temperature) is January (6.4°C).
Average pressure in September
Rui'an, China
- Average pressure in September: 1011.6mbar
The month with the highest atmospheric pressure is January (1025.1mbar).
The months with the lowest atmospheric pressure are July and August (1006.2mbar).
Average wind speed in September
Rui'an, China
- Average wind speed in September: 9.4km/h
The windiest month (with the highest average wind speed) is October (10.6km/h).
The calmest month (with the lowest average wind speed) is May (7.1km/h).
Average humidity in September
Rui'an, China
- Average humidity in September: 82%
The month with the highest relative humidity is June (88%).
The month with the lowest relative humidity is December (75%).
Average rainfall in September
Rui'an, China
- Average rainfall in September: 52mm
The wettest month (with the highest rainfall) is June (110mm).
The driest months (with the least rainfall) are January and February (18mm).
Average rainfall days in September
Rui'an, China
- Average rainfall days in September: 16.8 days
The month with the highest number of rainy days is August (19.5 days).
The month with the least rainy days is January (10.5 days).
Average snowfall in September
Rui'an, China
- Average snowfall in September: 0mm
The month with the highest snowfall is January (1mm).
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in September
Rui'an, China
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (0.2 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Rui'an, China
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 13h and 54min).
The month with the shortest days is December (Average daylight: 10h and 24min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is August (Average sunshine: 9h and 54min).
The months with the least sunshine are February and November (Average sunshine: 4h and 36min).
Average sunshine days in September
Rui'an, China
- Average sunshine days in September: 11.1 days
The month with the most sunshine days is December (18 days).
The month with the least sunshine days is June (9.2 days).
Average UV index in September
Rui'an, China
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, February and December (UV index 3).
Average cloud cover in September
Rui'an, China
- Average cloud cover in September: 46
The month with the most cloud cover is June (Cloud cover 61).
The months with the least cloud cover are July, August and October (Cloud cover 40).
Average visibility in September
Rui'an, China
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, August, September, October, November and December (9km).
The month with the lowest visibility is June (7km).
