September weather forecastHatteras, NC
September
Weather in September
September in Hatteras signals the summer season winding down, and October ushering in cooler weather. Shorter daylight hours begin to hint at the end of the sunny, outdoor-friendly period. The sea temperature cools down to 79°F (26.1°C), hinting for a stir in marine life patterns. Stronger winds persist, with average speeds of 13.4mph (21.6km/h) to remind of the impending autumn. A lower than average rainfall of 0.55" (14mm) over nine days is significant in what marks the end of the summer.Temperature
September's advent presents an average high-temperature of a still moderately hot 77.9°F (25.5°C), indicating a slight variation from the conditions of the previous month. Night temperatures in September exhibit a subtle decrease, settling at an average of 75.2°F (24°C).Humidity
In Hatteras, the average relative humidity in September is 77%.Rainfall
In Hatteras, in September, it is raining for 9 days, with typically 0.55" (14mm) of accumulated precipitation. In Hatteras, during the entire year, the rain falls for 100.9 days and collects up to 8.58" (218mm) of precipitation.Snowfall
In Hatteras, snow does not fall in April through November.Ocean temperature
In September, the average ocean temperature is 78.8°F (26°C).Note: For any water activity, surface water temperatures from 77°F (25°C) to 84.2°F (29°C) are deemed perfect and extremely pleasing for enduring enjoyment.
Daylight
The average length of the day in September in Hatteras is 12h and 23min.On the first day of September, sunrise is at 6:35 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:47 pm EDT.
Sunshine
In September, the average sunshine is 9.7h.UV index
In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The UV index of 6 in September translates into these instructions:
Guard against overexposure. Protection from sun-induced harm is essential. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Heads up! UV intensity is amplified by reflections from water and sand.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Hatteras, NC
- Average high temperature in September: 77.9°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (54.5°F).
- Average low temperature in September: 75.2°F
The month with the highest average low temperature is July (78.4°F).
The coldest month (with the lowest average low temperature) is January (46°F).
Average pressure in September
Hatteras, NC
- Average pressure in September: 30.01"Hg
The months with the highest atmospheric pressure are January, November and December (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in September
Hatteras, NC
- Average wind speed in September: 13.4mph
The windiest month (with the highest average wind speed) is March (17mph).
The calmest month (with the lowest average wind speed) is August (12mph).
Average humidity in September
Hatteras, NC
- Average humidity in September: 77%
The months with the highest relative humidity are May, June and July (79%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Hatteras, NC
- Average rainfall in September: 0.55"
The wettest month (with the highest rainfall) is August (1.06").
The driest month (with the least rainfall) is January (0.31").
Average rainfall days in September
Hatteras, NC
- Average rainfall days in September: 9 days
The month with the highest number of rainy days is July (13.5 days).
The month with the least rainy days is February (5.6 days).
Average snowfall days in September
Hatteras, NC
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January, February, March and December (0.1 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
Hatteras, NC
- Average sea temperature in September: 79°F
The best months for swimming (with the highest average sea temperature) are July and August (81°F).
The coldest month (with the lowest average sea temperature) is February (61°F).
Average daylight in September /
Average sunshine in September
Hatteras, NC
- Average daylight in September: 12h and 24min
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: 9h and 42min
The months with the most sunshine are June and July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 18min).
Average sunshine days in September
Hatteras, NC
- Average sunshine days in September: 16 days
The month with the most sunshine days is January (22.6 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in September
Hatteras, 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
Hatteras, NC
- Average cloud cover in September: 32
The month with the most cloud cover is March (Cloud cover 43).
The month with the least cloud cover is June (Cloud cover 26).
Average visibility in September
Hatteras, 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).
