September weather forecastTopsail Beach, NC
September
Weather in September
The arrival of September in Topsail Beach signifies a mild retreat from summer, with temperatures lowering to an average high of 81.9°F (27.7°C). The sea remains invitingly warm, with temperatures averaging 80.4°F (26.9°C). The daylight hours start to significantly shorten, marking a shift towards the cozier months ahead. The weather retains a summer ambiance, with the UV index dropping to a moderate value of 6. Interestingly, September experiences the highest rainfall of the year, averaging 2.91" (74mm), indicating the start of fall showers.Temperature
Topsail Beach, North Carolina, registers an average high-temperature of a still warm 81.9°F (27.7°C) at the commencement of September, closely related to the preceding month. In the month of September, the average temperature dips to an agreeable 72°F (22.2°C) during the night.Heat index
September's heat index is calculated to be a tropical 87.8°F (31°C). With extended exposure and activity, one might feel exhausted and experience heat cramps.Remember that heat index calculations are made for conditions in the shade with light wind. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', reflects the blend of air temperature and relative humidity to give a temperature impression. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Juveniles are regularly less conscious of the need to recuperate and rehydrate. Thirst is a tardy symptom of dehydration - hydration, especially during lengthy physical activities, should be maintained.
Humidity
The average relative humidity in September is 76%.Rainfall
The month with the most rainfall is September, when the rain falls for 14.4 days and typically aggregates up to 2.91" (74mm) of precipitation.Snowfall
March through November are months without snowfall.Ocean temperature
In Topsail Beach, in September, the average water temperature is 80.4°F (26.9°C).Note: For engaging in water activities including swimming and diving, temperatures from 77°F (25°C) to 84.2°F (29°C) are perceived as perfect, providing pleasure for extended durations.
Daylight
The average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 6:44 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:55 pm EDT.
Sunshine
In Topsail Beach, the average sunshine in September is 9.6h.UV index
In Topsail Beach, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for average individuals.Note: The daily high UV index of 6 during September translates into the following recommendations:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Stay cautious! Sand and water reflections increase UV radiation potency.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Topsail Beach, NC
- Average high temperature in September: 81.9°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (54.5°F).
- Average low temperature in September: 72°F
The month with the highest average low temperature is July (77°F).
The coldest month (with the lowest average low temperature) is January (42.4°F).
Average pressure in September
Topsail Beach, NC
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Topsail Beach, NC
- Average wind speed in September: 9.3mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is August (8.2mph).
Average humidity in September
Topsail Beach, NC
- Average humidity in September: 76%
The months with the highest relative humidity are August and December (77%).
The months with the lowest relative humidity are January and March (73%).
Average rainfall in September
Topsail Beach, NC
- Average rainfall in September: 2.91"
The wettest month (with the highest rainfall) is September (2.91").
The driest month (with the least rainfall) is January (0.79").
Average rainfall days in September
Topsail Beach, NC
- Average rainfall days in September: 14.4 days
The month with the highest number of rainy days is August (19.5 days).
The month with the least rainy days is November (8.2 days).
Average snowfall in September
Topsail Beach, NC
- Average snowfall in September: 0"
The months with the highest snowfall are January, February and December (0.04").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Topsail Beach, NC
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (0.3 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
Topsail Beach, NC
- Average sea temperature in September: 80.4°F
The best month for swimming (with the highest average sea temperature) is August (82.8°F).
The coldest month (with the lowest average sea temperature) is February (57.5°F).
Average daylight in September /
Average sunshine in September
Topsail Beach, NC
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 9h and 36min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days in September
Topsail Beach, NC
- Average sunshine days in September: 13.1 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is August (8.2 days).
Average UV index in September
Topsail Beach, NC
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).
Average cloud cover in September
Topsail Beach, NC
- Average cloud cover in September: 30
The months with the most cloud cover are February and December (Cloud cover 39).
The months with the least cloud cover are June and July (Cloud cover 26).
Average visibility in September
Topsail Beach, 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).
