September weather forecast
Siletz, OR

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Weather in September

The first month of the autumn, September, is also an enjoyable month in Siletz, Oregon, with temperature in the range of an average high of 65.5°F (18.6°C) and an average low of 52°F (11.1°C).

Temperature

September's average high-temperature is a still refreshing 65.5°F (18.6°C), maintaining a close comparison with August's 67.6°F (19.8°C). An average nighttime temperature of 52°F (11.1°C) is noted in Siletz during the month of September.

Humidity

April, May, July, September and October, with an average relative humidity of 81%, are the least humid months in Siletz.

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, snow does not fall in March through October and December.

Daylight

In Siletz, Oregon, the average length of the day in September is 12h and 30min.
On the first day of September, 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

The average sunshine in September is 9h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, a regular UV index of 4 translates into these guidelines:
Exercise prevention - Protecting skin and eyes from harm is required. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.

Frequently asked questions

What is the usual temperature for Siletz in September?

The high-temperature during September is 65.5°F (18.6°C) and the low-temperature is 52°F (11.1°C).

What are the least humid months?

The months with the lowest humidity are April, May, July, September and October, with an average relative humidity of 81%.

What is the average humidity in September?

In Siletz, Oregon, the average relative humidity in September is 81%.

How many days does it rain in September in Siletz?

In Siletz, during September, the rain falls for 6.8 days and regularly aggregates up to 0.91" (23mm) of precipitation.

When it does not snow?

March through October and December are months without snowfall.

What is the average length of the day in September?

In September, the average day length is 12h and 30min.

What time are sunrise and sunset in September?

On the first day of September, 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.

How long on average sun shines in September?

In September, the average sunshine duration is 9h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Siletz, OR

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / 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 - 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 - 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 - 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 - 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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