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
A minor decrease in the average high-temperature is observed during September, shifting from a moderately hot 81°F (27.2°C) in August to a pleasant 73°F (22.8°C). September generally records an average low-temperature of 55.8°F (13.2°C).Humidity
In September, the average relative humidity is 78%.Rainfall
September is the month with the least rainfall. Rain falls for 9.4 days and accumulates 0.55" (14mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September, sunrise is at 6:11 am and sunset at 7:18 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 6:28 pm EDT.
Sunshine
In Norfolk, the average sunshine in September is 8.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: A typical high UV index of 4 in September suggests the following recommendations:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
What is the driest month in Norfolk?
How much does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Norfolk have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Norfolk have in September?
How high is the UV index in September?
Average temperature in September
Norfolk, MA
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in September: 55.8°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in September
Norfolk, MA
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Norfolk, MA
- Average wind speed in September: 6.3mph
The windiest months (with the highest average wind speed) are January, February and March (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in September
Norfolk, MA
- Average humidity in September: 78%
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (71%).
Average rainfall in September
Norfolk, MA
- Average rainfall in September: 0.55"
The wettest month (with the highest rainfall) is July (1.18").
The driest month (with the least rainfall) is September (0.55").
Average rainfall days in September
Norfolk, MA
- Average rainfall days in September: 9.4 days
The month with the highest number of rainy days is July (14 days).
The month with the least rainy days is January (6.2 days).
Average snowfall in September
Norfolk, MA
- Average snowfall in September: 0"
The month with the highest snowfall is March (1.61").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Norfolk, MA
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (5.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Norfolk, MA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in September
Norfolk, MA
- Average sunshine days in September: 18.5 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is June (14.6 days).
Average UV index in September
Norfolk, MA
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Norfolk, MA
- Average cloud cover in September: 39
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in September
Norfolk, MA
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, May, October, November and December (6mi).
The months with the lowest visibility are June, July, August and September (5mi).
Norfolk, Massachusetts, USA
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