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
September involves a decrease in temperature, down from a moderately hot 75.4°F (24.1°C) in August to a comfortable 64.6°F (18.1°C). South Cle Elum logs a notable disparity from the daily highs during September, as the nighttime temperature lowers to an average of 42.3°F (5.7°C).Humidity
The average relative humidity in September is 68%.Rainfall
In South Cle Elum, during September, the rain falls for 10.7 days and regularly aggregates up to 1.1" (28mm) of precipitation. In South Cle Elum, during the entire year, the rain falls for 161.2 days and collects up to 28.46" (723mm) of precipitation.Snowfall
Months with snowfall in South Cle Elum are January through May, September through December. September is the first month it typically snows in South Cle Elum. Throughout September, in the average 0.2 snowfall days, it receives 0.2" (5mm) of snow. Throughout the year, there are 69.9 snowfall days, and 60.24" (1530mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 32min.On the first day of September in South Cle Elum, sunrise is at 6:24 am and sunset at 7:42 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:44 pm PDT.
Sunshine
In September, the average sunshine in South Cle Elum is 10.2h.UV index
In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 3 during September translates into the following guidance:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Frequently asked questions
What are the temperatures in South Cle Elum in September?
What is the average humidity in September in South Cle Elum?
How much does it rain in South Cle Elum in September?
When does it start to snow in South Cle Elum?
How many hours of daylight does South Cle Elum have in September?
When are sunrise and sunset in September in South Cle Elum?
How many hours of sunshine does South Cle Elum have in September?
What is the UV index reading in September in South Cle Elum?
Average temperature in September
South Cle Elum, WA
- Average high temperature in September: 64.6°F
The warmest month (with the highest average high temperature) is August (75.4°F).
The month with the lowest average high temperature is December (29.7°F).
- Average low temperature in September: 42.3°F
The month with the highest average low temperature is August (47.8°F).
The coldest month (with the lowest average low temperature) is December (18.3°F).
Average pressure in September
South Cle Elum, WA
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is August (29.96"Hg).
Average wind speed in September
South Cle Elum, WA
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is June (6.7mph).
The calmest month (with the lowest average wind speed) is December (4.2mph).
Average humidity in September
South Cle Elum, WA
- Average humidity in September: 68%
The months with the highest relative humidity are January and February (92%).
The months with the lowest relative humidity are July and August (60%).
Average rainfall in September
South Cle Elum, WA
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is January (4.41").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in September
South Cle Elum, WA
- Average rainfall days in September: 10.7 days
The months with the highest number of rainy days are March and April (18.3 days).
The month with the least rainy days is August (5.5 days).
Average snowfall in September
South Cle Elum, WA
- Average snowfall in September: 0.2"
The month with the highest snowfall is January (16.3").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
South Cle Elum, WA
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (15.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
South Cle Elum, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 10h and 1min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in September
South Cle Elum, WA
- Average sunshine days in September: 16.3 days
The month with the most sunshine days is August (22.8 days).
The month with the least sunshine days is February (6.8 days).
Average UV index in September
South Cle Elum, WA
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
South Cle Elum, WA
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 18).
Average visibility in September
South Cle Elum, 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 (3mi).
South Cle Elum, Washington, USA
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