September weather forecast
Scappoose, OR

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Weather in September

September, the first month of the autumn in Scappoose, is also an agreeable month, with an average temperature ranging between min 49.8°F (9.9°C) and max 72.3°F (22.4°C).

Temperature

The onset of September aligns with a soft reduction in the average high-temperature, gently falling from a moderately hot 79.7°F (26.5°C) in August to an agreeable 72.3°F (22.4°C). During September, Scappoose notes a substantial drop from the daytime peak to an average minimum temperature of 49.8°F (9.9°C).

Humidity

In Scappoose, the average relative humidity in September is 74%.

Rainfall

In September, in Scappoose, the rain falls for 11.5 days. Throughout September, 1.81" (46mm) of precipitation is accumulated. Throughout the year, there are 181.3 rainfall days, and 35.55" (903mm) of precipitation is accumulated.

Snowfall

In Scappoose, snow does not fall in April through October.

Daylight

The average length of the day in September is 12h and 31min.
On the first day of the month, sunrise is at 6:33 am and sunset at 7:48 pm. On the last day of September, in Scappoose, sunrise is at 7:09 am and sunset at 6:52 pm PDT.

Sunshine

The average sunshine in September is 9h.

UV index

In Scappoose, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: In September, the maximum UV index of 4 suggests these recommendations:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. To guard against the harmful effects of the Sun, minimize exposure during midday. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
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Frequently asked questions

What is the usual temperature for Scappoose in September?

The high-temperature, in September, in Scappoose, is 72.3°F (22.4°C), while the low-temperature averages to 49.8°F (9.9°C).

What is the average humidity in September in Scappoose?

The average relative humidity in September is 74%.

How much does it rain in Scappoose in September?

In Scappoose, Oregon, during September, the rain falls for 11.5 days and regularly aggregates up to 1.81" (46mm) of precipitation.

When it does not snow in Scappoose?

April through October are months without snowfall in Scappoose.

What is the average length of the day in September in Scappoose?

The average day length in September in Scappoose, Oregon, is 12h and 31min.

When are sunrise and sunset in September in Scappoose?

On the first day of September in Scappoose, Oregon, sunrise is at 6:33 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:52 pm PDT.

How long on average sun shines in September in Scappoose?

In September, the average sunshine duration in Scappoose, Oregon, is 9h.

How high is the UV index in September in Scappoose?

In Scappoose, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
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
Scappoose, OR

Average temperature in September - Scappoose, OR
  • Average high temperature in September: 72.3°F

The warmest month (with the highest average high temperature) is August (79.7°F).
The month with the lowest average high temperature is December (42.8°F).

  • Average low temperature in September: 49.8°F

The month with the highest average low temperature is August (52.9°F).
The coldest month (with the lowest average low temperature) is December (33.1°F).

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Average pressure in September
Scappoose, OR

Average pressure in September - Scappoose, OR
  • Average pressure in September: 30.01"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).

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Average wind speed in September
Scappoose, OR

Average wind speed in September - Scappoose, OR
  • Average wind speed in September: 4mph

The windiest month (with the highest average wind speed) is March (4.8mph).
The calmest month (with the lowest average wind speed) is September (4mph).

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Average humidity in September
Scappoose, OR

Average humidity in September - Scappoose, OR
  • Average humidity in September: 74%

The months with the highest relative humidity are February and November (87%).
The months with the lowest relative humidity are July and August (69%).

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Average rainfall in September
Scappoose, OR

Average rainfall in September - Scappoose, OR
  • Average rainfall in September: 1.81"

The wettest month (with the highest rainfall) is January (5.24").
The driest month (with the least rainfall) is August (0.43").

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Average rainfall days in September
Scappoose, OR

Average rainfall days in September - Scappoose, OR
  • Average rainfall days in September: 11.5 days

The month with the highest number of rainy days is March (21.1 days).
The months with the least rainy days are July and August (5.5 days).

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Average snowfall in September
Scappoose, OR

Average snowfall in September - Scappoose, OR
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.77").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Scappoose, OR

Average snowfall days in September - Scappoose, OR
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Scappoose, OR

Average daylight in September / Average sunshine in September - Scappoose, OR
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are January and February (Average sunshine: 3h and 48min).

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Average sunshine days in September
Scappoose, OR

Average sunshine days in September - Scappoose, OR
  • Average sunshine days in September: 16.5 days

The month with the most sunshine days is July (23.2 days).
The month with the least sunshine days is February (7.8 days).

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Average UV index in September
Scappoose, OR

Average UV index in September - Scappoose, OR
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Scappoose, OR

Average cloud cover in September - Scappoose, OR
  • Average cloud cover in September: 37

The month with the most cloud cover is February (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in September
Scappoose, OR

Average visibility in September - Scappoose, OR
  • Average visibility in September: 5mi

The month with the highest visibility is August (6mi).
The months with the lowest visibility are January, February, March, November and December (4mi).

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Scappoose, Oregon, USA

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