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 ushering in of September brings an average high-temperature of a moderately hot 81.5°F (27.5°C), closely mirroring the 86.5°F (30.3°C) of August. During September, Princeton's temperature falls to a steady low-temperature average of 65.3°F (18.5°C).Heat index
September's mean heat index is appraised at a hot 87.8°F (31°C). If one sustains activity during exposure, it could lead to a sense of fatigue, with a chance of heat cramps.It is emphasized that the heat index's values are meant for shaded zones with mild winds. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', joins air temperature with relative humidity to produce a temperature perception for humans. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are extremely vital to babies and toddlers. 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
The months with the highest humidity are August and September, with an average relative humidity of 78%.Rainfall
In Princeton, in September, during 13.2 rainfall days, 3.31" (84mm) of precipitation is typically accumulated. Throughout the year, there are 161 rainfall days, and 32.95" (837mm) of precipitation is accumulated.Snowfall
In Princeton, snow does not fall in April through November.Daylight
In Princeton, North Carolina, the average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 6:45 am and sunset at 7:39 pm. On the last day of September, sunrise is at 7:07 am and sunset at 6:57 pm EDT.
Sunshine
The average sunshine in September is 8.9h.UV index
In Princeton, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Boost your sun resistance with garments that are densely woven yet spacious.
Frequently asked questions
What is the temperature in September in Princeton?
What are the most humid months in Princeton?
What is the average humidity in September in Princeton?
How many days does it rain in September in Princeton?
When it does not snow in Princeton?
What is the average length of the day in September in Princeton?
What time are sunrise and sunset in September in Princeton?
How many hours of sunshine does Princeton have in September?
What is the UV index intensity in September in Princeton?
Average temperature in September
Princeton, NC
- Average high temperature in September: 81.5°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (49.1°F).
- Average low temperature in September: 65.3°F
The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (34.3°F).
Average pressure in September
Princeton, NC
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Princeton, NC
- Average wind speed in September: 6.8mph
The windiest month (with the highest average wind speed) is April (9.1mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in September
Princeton, NC
- Average humidity in September: 78%
The months with the highest relative humidity are August and September (78%).
The months with the lowest relative humidity are January, March and November (73%).
Average rainfall in September
Princeton, NC
- Average rainfall in September: 3.31"
The wettest month (with the highest rainfall) is August (4.02").
The driest month (with the least rainfall) is January (1.93").
Average rainfall days in September
Princeton, NC
- Average rainfall days in September: 13.2 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is November (8.6 days).
Average snowfall in September
Princeton, NC
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.1").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Princeton, NC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (1.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Princeton, NC
- 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: 8h and 5min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in September
Princeton, NC
- Average sunshine days in September: 14.9 days
The month with the most sunshine days is October (20.2 days).
The month with the least sunshine days is July (10.1 days).
Average UV index in September
Princeton, NC
- 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
Princeton, NC
- Average cloud cover in September: 37
The months with the most cloud cover are February and March (Cloud cover 42).
The month with the least cloud cover is June (Cloud cover 32).
Average visibility in September
Princeton, NC
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Princeton, North Carolina, USA
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