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
Stehekin's September weather features a mild decline in high-temperatures, reducing from a pleasant 71.4°F (21.9°C) in August to a comfortable 61.3°F (16.3°C). Stehekin records a significant temperature drop in September nights, lowering to an average of 39.2°F (4°C).Humidity
In September, the average relative humidity is 68%.Rainfall
In Stehekin, during September, the rain falls for 6 days and regularly aggregates up to 0.79" (20mm) of precipitation. Throughout the year, there are 65.5 rainfall days, and 10.67" (271mm) of precipitation is accumulated.Snowfall
January through July, September through December are months with snowfall. September is the first month it typically snows in Stehekin. Throughout September, in the average 2.6 snowfall days, it receives 1.85" (47mm) of snow. In Stehekin, during the entire year, snow falls for 97 days and aggregates up to 51.61" (1311mm) of snow.Daylight
The average length of the day in September is 12h and 34min.On the first day of September, sunrise is at 6:21 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:42 pm PDT.
Sunshine
In Stehekin, the average sunshine in September is 10.2h.UV index
The average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 2 suggests these recommendations:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How many days does it rain in September in Stehekin?
When does it start to snow?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Stehekin, WA
- Average high temperature in September: 61.3°F
The warmest month (with the highest average high temperature) is August (71.4°F).
The month with the lowest average high temperature is December (25.7°F).
- Average low temperature in September: 39.2°F
The month with the highest average low temperature is August (46.4°F).
The coldest month (with the lowest average low temperature) is December (12.6°F).
Average pressure in September
Stehekin, 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 (29.95"Hg).
Average wind speed in September
Stehekin, WA
- Average wind speed in September: 4.6mph
The windiest month (with the highest average wind speed) is June (5.2mph).
The calmest month (with the lowest average wind speed) is December (4.2mph).
Average humidity in September
Stehekin, WA
- Average humidity in September: 68%
The months with the highest relative humidity are January, February and December (93%).
The months with the lowest relative humidity are July and August (60%).
Average rainfall in September
Stehekin, WA
- Average rainfall in September: 0.79"
The wettest months (with the highest rainfall) are January and December (1.34").
The driest month (with the least rainfall) is August (0.43").
Average rainfall days in September
Stehekin, WA
- Average rainfall days in September: 6 days
The month with the highest number of rainy days is June (10.4 days).
The month with the least rainy days is December (2.1 days).
Average snowfall in September
Stehekin, WA
- Average snowfall in September: 1.85"
The month with the highest snowfall is December (9.8").
The month with the least snowfall is August (0").
Average snowfall days in September
Stehekin, WA
- Average snowfall days in September: 2.6 days
The month with the highest number of snowfall days is March (13.7 days).
The month with the least snowfall days is August (0.2 days).
Average daylight in September /
Average sunshine in September
Stehekin, 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: 10h and 1min
The month with the most sunshine is August (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in September
Stehekin, WA
- Average sunshine days in September: 20.7 days
The month with the most sunshine days is August (22.9 days).
The months with the least sunshine days are April and May (15.4 days).
Average UV index in September
Stehekin, WA
- Average UV index in September: 2
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
Stehekin, WA
- Average cloud cover in September: 31
The month with the most cloud cover is December (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in September
Stehekin, WA
- Average visibility in September: 6mi
The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January and February (2mi).
Stehekin, Washington, USA
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