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 corresponds with a decrease in the average high-temperature, down to a comfortable 61.3°F (16.3°C) from a pleasant 71.4°F (21.9°C). In Stehekin, the September nights descend to a significantly cooler average of 39.2°F (4°C) compared to daytime highs.Humidity
In September, the average relative humidity is 68%.Rainfall
In Stehekin, in September, it is raining for 6 days, with typically 0.79" (20mm) of accumulated precipitation. Throughout the year, there are 65.5 rainfall days, and 10.67" (271mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through July, September through December. 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, Washington, during the entire year, snow falls for 97 days and aggregates up to 51.61" (1311mm) of snow.Daylight
In Stehekin, the average length of the day in September is 12h and 34min.On the first day of September in Stehekin, 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
The average sunshine in September in Stehekin is 10.2h.UV index
In September, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the maximum UV index of 2 transforms into these recommendations:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Frequently asked questions
What are September temperatures in Stehekin?
What is the average humidity in September in Stehekin?
How much does it rain in Stehekin in September?
When does it start snowing in Stehekin?
How many hours of daylight does Stehekin have in September?
When are sunrise and sunset in September in Stehekin?
How long on average sun shines in September in Stehekin?
How high is the UV index in September in Stehekin?
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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