September weather forecastSkykomish, WA
September
Weather in September
September, the first month of the autumn in Skykomish, is still a comfortable month, with an average temperature ranging between min 40.5°F (4.7°C) and max 62.1°F (16.7°C).Temperature
Start of September brings a slight shift in the average high-temperature, dipping a bit from August's agreeable 69.4°F (20.8°C) to a comfortable 62.1°F (16.7°C). September presents a pronounced divergence from daily peak temperatures, with the average low-temperature of 40.5°F (4.7°C).Humidity
The average relative humidity in September is 77%.Rainfall
In September, the rain falls for 15.1 days. Throughout September, 2.6" (66mm) of precipitation is accumulated. In Skykomish, during the entire year, the rain falls for 207.7 days and collects up to 61.81" (1570mm) of precipitation.Snowfall
In Skykomish, snow does not fall in June through October.Daylight
The average length of the day in September is 12h and 33min.On the first day of the month, sunrise is at 6:25 am and sunset at 7:45 pm. On the last day of September, sunrise is at 7:04 am and sunset at 6:45 pm PDT.
Sunshine
In September, the average sunshine is 8h.UV index
In September, the average daily maximum UV index in Skykomish is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index of 2 during September leads to these instructions:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. To avoid the Sun's strongest rays, limit exposure around the mid-day period. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Skykomish, WA
- Average high temperature in September: 62.1°F
The warmest month (with the highest average high temperature) is August (69.4°F).
The month with the lowest average high temperature is December (32.9°F).
- Average low temperature in September: 40.5°F
The month with the highest average low temperature is August (44.2°F).
The coldest month (with the lowest average low temperature) is December (22.1°F).
Average pressure in September
Skykomish, WA
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (29.98"Hg).
Average wind speed in September
Skykomish, WA
- Average wind speed in September: 3.4mph
The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest months (with the lowest average wind speed) are August and September (3.4mph).
Average humidity in September
Skykomish, WA
- Average humidity in September: 77%
The month with the highest relative humidity is February (93%).
The months with the lowest relative humidity are July and August (73%).
Average rainfall in September
Skykomish, WA
- Average rainfall in September: 2.6"
The wettest month (with the highest rainfall) is January (9.96").
The driest month (with the least rainfall) is July (0.94").
Average rainfall days in September
Skykomish, WA
- Average rainfall days in September: 15.1 days
The month with the highest number of rainy days is April (22.6 days).
The month with the least rainy days is August (9.9 days).
Average snowfall in September
Skykomish, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (16.26").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Skykomish, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (11 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Skykomish, WA
- Average daylight in September: 12h and 30min
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 30min).
- Average sunshine in September: 8h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 0min).
Average sunshine days in September
Skykomish, WA
- Average sunshine days in September: 12.5 days
The month with the most sunshine days is August (17.9 days).
The months with the least sunshine days are February and April (5.8 days).
Average UV index in September
Skykomish, 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 and November (UV index 1).
Average cloud cover in September
Skykomish, WA
- Average cloud cover in September: 48
The month with the most cloud cover is March (Cloud cover 71).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in September
Skykomish, WA
- Average visibility in September: 4mi
The months with the highest visibility are July and August (5mi).
The months with the lowest visibility are January and February (3mi).
