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 onset of September entails a temperature shift, as the average high-temperature decreases from a moderately hot 80.2°F (26.8°C) in August to an agreeable 69.1°F (20.6°C). With a notable disparity from daily peak temperatures, the average low-temperature settles at a frosty 43°F (6.1°C) throughout September.Humidity
The average relative humidity in September is 61%.Rainfall
In Usk, in September, during 9 rainfall days, 1.02" (26mm) of precipitation is typically accumulated. In Usk, during the entire year, the rain falls for 130.2 days and collects up to 24.17" (614mm) of precipitation.Snowfall
January through June, September through December are months with snowfall in Usk. September is the first month it typically snows. Throughout September, in the average 0.6 snowfall days, it receives 0.47" (12mm) of snow. Throughout the year, there are 122.5 snowfall days, and 103.78" (2636mm) of snow is accumulated.Daylight
In Usk, Washington, the average length of the day in September is 12h and 34min.On the first day of the month, sunrise is at 6:07 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:29 pm PDT.
Sunshine
The average sunshine in September is 9.9h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: The maximum daily UV index, 3 in September, converts into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How much does it rain in September?
When does it start snowing?
How many hours of daylight does Usk have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Usk have in September?
What is the UV index intensity in September?
Average temperature in September
Usk, WA
- Average high temperature in September: 69.1°F
The warmest month (with the highest average high temperature) is August (80.2°F).
The month with the lowest average high temperature is December (28.8°F).
- Average low temperature in September: 43°F
The month with the highest average low temperature is August (50.2°F).
The coldest months (with the lowest average low temperature) are February and December (18°F).
Average pressure in September
Usk, WA
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Usk, WA
- Average wind speed in September: 3.9mph
The windiest month (with the highest average wind speed) is April (4.4mph).
The calmest month (with the lowest average wind speed) is December (3.3mph).
Average humidity in September
Usk, WA
- Average humidity in September: 61%
The month with the highest relative humidity is January (95%).
The month with the lowest relative humidity is August (51%).
Average rainfall in September
Usk, WA
- Average rainfall in September: 1.02"
The wettest month (with the highest rainfall) is January (2.99").
The driest month (with the least rainfall) is August (0.51").
Average rainfall days in September
Usk, WA
- Average rainfall days in September: 9 days
The month with the highest number of rainy days is April (17.2 days).
The months with the least rainy days are February and August (6.8 days).
Average snowfall in September
Usk, WA
- Average snowfall in September: 0.47"
The month with the highest snowfall is January (23.39").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Usk, WA
- Average snowfall days in September: 0.6 days
The month with the highest number of snowfall days is December (21.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Usk, WA
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 9h and 5min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in September
Usk, WA
- Average sunshine days in September: 18.5 days
The month with the most sunshine days is August (21.9 days).
The months with the least sunshine days are February, March and April (7.8 days).
Average UV index in September
Usk, WA
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are February, November and December (UV index 1).
Average cloud cover in September
Usk, WA
- Average cloud cover in September: 24
The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is August (Cloud cover 14).
Average visibility in September
Usk, WA
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The month with the lowest visibility is January (2mi).
Usk, Washington, USA
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