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 arrival of September corresponds with a light shift in temperature, down from a moderately hot 78.4°F (25.8°C) in August to an agreeable 70.7°F (21.5°C). DuPont anticipates a considerable daily temperature fluctuation in September, with low temperatures averaging a chilly 48.9°F (9.4°C).Humidity
The average relative humidity in September is 76%.Rainfall
In DuPont, in September, during 12 rainfall days, 1.65" (42mm) of precipitation is typically accumulated. In DuPont, during the entire year, the rain falls for 174.2 days and collects up to 31.06" (789mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
In DuPont, the average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 6:31 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:09 am and sunset at 6:51 pm PDT.
Sunshine
In September, the average sunshine is 9h.UV index
In DuPont, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September in DuPont?
How many hours of sunshine does DuPont have in September?
How high is the UV index in September?
Average temperature in September
DuPont, WA
- Average high temperature in September: 70.7°F
The warmest month (with the highest average high temperature) is August (78.4°F).
The month with the lowest average high temperature is December (43.5°F).
- Average low temperature in September: 48.9°F
The month with the highest average low temperature is August (52.2°F).
The coldest month (with the lowest average low temperature) is February (34°F).
Average pressure in September
DuPont, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in September
DuPont, WA
- Average wind speed in September: 3.9mph
The windiest month (with the highest average wind speed) is March (5mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in September
DuPont, WA
- Average humidity in September: 76%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is July (69%).
Average rainfall in September
DuPont, WA
- Average rainfall in September: 1.65"
The wettest month (with the highest rainfall) is December (4.96").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in September
DuPont, WA
- Average rainfall days in September: 12 days
The month with the highest number of rainy days is March (19.7 days).
The month with the least rainy days is August (5.2 days).
Average snowfall in September
DuPont, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.73").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
DuPont, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
DuPont, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).
Average sunshine days in September
DuPont, WA
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is August (22.9 days).
The month with the least sunshine days is November (9.1 days).
Average UV index in September
DuPont, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
DuPont, WA
- Average cloud cover in September: 37
The months with the most cloud cover are January and December (Cloud cover 59).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility in September
DuPont, WA
- Average visibility in September: 5mi
The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January, February and December (4mi).
DuPont, Washington, USA
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