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
Siletz's shift into September sets the average high-temperature at a still enjoyable 65.5°F (18.6°C), a figure that deviates only slightly from August's 67.6°F (19.8°C). Siletz temperatures generally rest at a low of 52°F (11.1°C) during the September nights.Humidity
The months with the lowest humidity are April, May, July, September and October, with an average relative humidity of 81%.Rainfall
In Siletz, in September, it is raining for 6.8 days, with typically 0.91" (23mm) of accumulated precipitation. In Siletz, during the entire year, the rain falls for 139.5 days and collects up to 18.66" (474mm) of precipitation.Snowfall
In Siletz, Oregon, snow does not fall in March through October and December.Daylight
In Siletz, the average length of the day in September is 12h and 30min.On the first day of September in Siletz, sunrise is at 6:39 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 6:57 pm PDT.
Sunshine
In Siletz, the average sunshine in September is 9h.UV index
The average daily maximum UV index in September in Siletz is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: In September, the maximum UV index of 4 transforms into these recommendations:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Frequently asked questions
What are September temperatures in Siletz?
What is the least humid month in Siletz?
What is the average humidity in September in Siletz?
How much does it rain in Siletz in September?
When it does not snow in Siletz?
What is the average length of the day in September in Siletz?
When is the sunrise / sunset in September in Siletz?
How many hours of sunshine does Siletz have in September?
How high is the UV index in September in Siletz?
Average temperature in September
Siletz, OR
- Average high temperature in September: 65.5°F
The warmest month (with the highest average high temperature) is August (67.6°F).
The month with the lowest average high temperature is December (47.7°F).
- Average low temperature in September: 52°F
The month with the highest average low temperature is August (53.6°F).
The coldest month (with the lowest average low temperature) is December (40.6°F).
Average pressure in September
Siletz, OR
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is September (30.02"Hg).
Average wind speed in September
Siletz, OR
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in September
Siletz, OR
- Average humidity in September: 81%
The months with the highest relative humidity are February, March, November and December (83%).
The months with the lowest relative humidity are April, May, July, September and October (81%).
Average rainfall in September
Siletz, OR
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is December (3.07").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in September
Siletz, OR
- Average rainfall days in September: 6.8 days
The month with the highest number of rainy days is March (18.2 days).
The month with the least rainy days is August (3.7 days).
Average snowfall in September
Siletz, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.28").
The months with the least snowfall are March, April, May, June, July, August, September, October and December (0").
Average snowfall days in September
Siletz, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.9 days).
The months with the least snowfall days are March, April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Siletz, OR
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January and February (Average sunshine: 4h and 0min).
Average sunshine days in September
Siletz, OR
- Average sunshine days in September: 21.5 days
The month with the most sunshine days is July (25.8 days).
The month with the least sunshine days is March (10.9 days).
Average UV index in September
Siletz, OR
- Average UV index in September: 4
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are February, November and December (UV index 2).
Average cloud cover in September
Siletz, OR
- Average cloud cover in September: 34
The months with the most cloud cover are February and March (Cloud cover 59).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in September
Siletz, OR
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, October, November and December (6mi).
The months with the lowest visibility are August and September (5mi).
Siletz, Oregon, USA
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