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 arrival of September correlates with a minor temperature reduction, down from August's moderately hot 84.7°F (29.3°C) to a still warm 79.2°F (26.2°C). Norfolk temperatures generally rest at a low of 68.4°F (20.2°C) during the September nights.Humidity
The average relative humidity in September is 76%.Rainfall
In Norfolk, in September, it is raining for 13 days, with typically 2.28" (58mm) of accumulated precipitation. Throughout the year, in Norfolk, there are 151.9 rainfall days, and 20.35" (517mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Ocean temperature
In Norfolk, in September, the average water temperature is 75.6°F (24.2°C).Note: If cold is not your friend, swimming at 75.6°F (24.2°C) might be daunting. But the right mix of sunshine, wind, and external temperature can make a difference. Although wetsuits are not essential, they can enhance the swimming experience.
Daylight
The average length of the day in September in Norfolk is 12h and 24min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:33 pm. On the last day of September, sunrise is at 7:00 am and sunset at 6:49 pm EDT.
Sunshine
The average sunshine in September in Norfolk is 9.4h.UV index
In September, the average daily maximum UV index in Norfolk is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum UV index, 5 during September, leads to the following recommendations:
Adopt protective measures - It is advised to guard against sun damage. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Experience reduced UV exposure by about half when donning a wide-brim hat. Alert! Sand and water increase UV exposure due to their reflective properties.
Frequently asked questions
What is the usual temperature for Norfolk in September?
What is the average humidity in September in Norfolk?
How many days does it rain in September in Norfolk?
When it does not snow in Norfolk?
What is the water temperature in September in Norfolk?
What is the average length of the day in September in Norfolk?
What time are sunrise and sunset in September in Norfolk?
How long on average sun shines in September in Norfolk?
How high is the UV index in September in Norfolk?
Average temperature in September
Norfolk, VA
- Average high temperature in September: 79.2°F
The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (45.9°F).
- Average low temperature in September: 68.4°F
The month with the highest average low temperature is July (73.6°F).
The coldest month (with the lowest average low temperature) is January (34.7°F).
Average pressure in September
Norfolk, VA
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Norfolk, VA
- Average wind speed in September: 8.7mph
The windiest months (with the highest average wind speed) are March and April (10.5mph).
The calmest month (with the lowest average wind speed) is August (7.5mph).
Average humidity in September
Norfolk, VA
- Average humidity in September: 76%
The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are July and November (74%).
Average rainfall in September
Norfolk, VA
- Average rainfall in September: 2.28"
The wettest month (with the highest rainfall) is August (2.52").
The driest month (with the least rainfall) is November (1.1").
Average rainfall days in September
Norfolk, VA
- Average rainfall days in September: 13 days
The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is November (8.3 days).
Average snowfall in September
Norfolk, VA
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.47").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Norfolk, VA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in September
Norfolk, VA
- Average sea temperature in September: 75.6°F
The best month for swimming (with the highest average sea temperature) is August (80°F).
The coldest month (with the lowest average sea temperature) is February (44.5°F).
Average daylight in September /
Average sunshine in September
Norfolk, VA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 24min).
Average sunshine days in September
Norfolk, VA
- Average sunshine days in September: 13.9 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is August (10.8 days).
Average UV index in September
Norfolk, VA
- Average UV index in September: 5
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in September
Norfolk, VA
- Average cloud cover in September: 33
The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in September
Norfolk, VA
- 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).
Norfolk, Virginia, USA
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