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 shift from August to September in Smithfield coincides with a small decrease in the average high-temperature, down to a pleasant 72.9°F (22.7°C) from a warm 80.4°F (26.9°C). Throughout the month of September, Smithfield witnesses an average low-temperature of 55.9°F (13.3°C).Humidity
February, June, September and October, with an average relative humidity of 78%, are the most humid months.Rainfall
September is the month with the least rainfall. Rain falls for 10.3 days and accumulates 1.06" (27mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September in Smithfield, Rhode Island, is 12h and 28min.On the first day of the month, sunrise is at 6:12 am and sunset at 7:19 pm. On the last day of September, in Smithfield, sunrise is at 6:42 am and sunset at 6:29 pm EDT.
Sunshine
In Smithfield, the average sunshine in September is 8.3h.UV index
The average daily maximum UV index in September in Smithfield is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In September, the maximum UV index of 4 suggests these recommendations:
Act with care - The need to guard against sun damage is communicated. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Smithfield?
What is the most humid month in Smithfield?
What is the average humidity in September in Smithfield?
What is the driest month in Smithfield?
How many days does it rain in September in Smithfield?
When it does not snow in Smithfield?
Does it snow in Smithfield in September?
What is the average length of the day in September in Smithfield?
When is the sunrise / sunset in September in Smithfield?
How long on average sun shines in September in Smithfield?
How high is the UV index in September in Smithfield?
Average temperature in September
Smithfield, RI
- Average high temperature in September: 72.9°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.8°F).
- Average low temperature in September: 55.9°F
The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (21.7°F).
Average pressure in September
Smithfield, RI
- Average pressure in September: 30.05"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
Smithfield, RI
- Average wind speed in September: 6.7mph
The windiest months (with the highest average wind speed) are February and March (9.4mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
Smithfield, RI
- Average humidity in September: 78%
The months with the highest relative humidity are February, June, September and October (78%).
The month with the lowest relative humidity is April (71%).
Average rainfall in September
Smithfield, RI
- Average rainfall in September: 1.06"
The wettest month (with the highest rainfall) is April (2.52").
The driest month (with the least rainfall) is September (1.06").
Average rainfall days in September
Smithfield, RI
- Average rainfall days in September: 10.3 days
The month with the highest number of rainy days is June (15.1 days).
The month with the least rainy days is January (7.1 days).
Average snowfall in September
Smithfield, RI
- Average snowfall in September: 0"
The month with the highest snowfall is March (3.03").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Smithfield, RI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is March (6.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Smithfield, RI
- 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
Smithfield, RI
- Average sunshine days in September: 17.8 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is April (13.6 days).
Average UV index in September
Smithfield, RI
- 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
Smithfield, RI
- 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 34).
Average visibility in September
Smithfield, RI
- 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).
Smithfield, Rhode Island, USA
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