September weather forecast
Pendleton, OR

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These large silos and creatively shaped red barns stand in the middle of a vast field of harvested wheat, in Pendleton, Oregon
These large silos and creatively shaped red barns stand in the middle of a vast field of harvested wheat, in Pendleton, Oregon

Weather in September

September's weather showcases cooling temperatures as Pendleton transitions slowly towards autumn. With a noticeable reduction in daylight and similar decrease in sunshine hours compared to August, September marks the soft closure of the summer season. Despite this, the pleasant weather offers an ideal opportunity for enjoying outdoor pursuits before winter sets in. Do remember, though, that while the conditions are generally soothing, there's a possible increase in wind speeds to deal with.

Temperature

Pendleton's weather changes with the onset of September, slightly falling from a moderately hot 84°F (28.9°C) in August to a still warm 74.1°F (23.4°C). September nights in Pendleton cool down to an average low-temperature of 54.7°F (12.6°C).

Humidity

In September, the average relative humidity is 46%.

Rainfall

In Pendleton, in September, it is raining for 7 days, with typically 0.51" (13mm) of accumulated precipitation. In Pendleton, during the entire year, the rain falls for 132.7 days and collects up to 12.91" (328mm) of precipitation.

Snowfall

January through April, September, November and December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 17.5 snowfall days, and 9.41" (239mm) of snow is accumulated.

Daylight

The average length of the day in September in Pendleton is 12h and 31min.
On the first day of the month, sunrise is at 6:17 am and sunset at 7:32 pm. On the last day of September, sunrise is at 6:53 am and sunset at 6:36 pm PDT.

Sunshine

In Pendleton, the average sunshine in September is 10.6h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.
Note: A daily high UV index of 4 in September leads to these guidelines:
Heed the precautions - It is counselled to guard against solar damage. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
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Frequently asked questions

What are September temperatures in Pendleton?

The high-temperature, in September, in Pendleton, is 74.1°F (23.4°C), while the low-temperature averages to 54.7°F (12.6°C).

What is the average humidity in September in Pendleton?

The average relative humidity in September in Pendleton is 46%.

How much does it rain in Pendleton in September?

In Pendleton, in September, it is raining for 7 days, with typically 0.51" (13mm) of accumulated precipitation.

When does it start to snow in Pendleton?

September is the first month it typically snows in Pendleton. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow.

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

In September, the average day length is 12h and 31min.

What time are sunrise and sunset in September in Pendleton?

On the first day of September in Pendleton, Oregon, sunrise is at 6:17 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:36 pm PDT.

How many hours of sunshine does Pendleton have in September?

In September, the average sunshine duration in Pendleton, Oregon, is 10.6h.

How high is the UV index in September in Pendleton?

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

Average temperature in September - Pendleton, OR
  • Average high temperature in September: 74.1°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is December (37.9°F).

  • Average low temperature in September: 54.7°F

The month with the highest average low temperature is August (61.7°F).
The coldest month (with the lowest average low temperature) is December (27.3°F).

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Average pressure in September
Pendleton, OR

Average pressure in September - Pendleton, OR
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is January (30.2"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).

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Average wind speed in September
Pendleton, OR

Average wind speed in September - Pendleton, OR
  • Average wind speed in September: 6.2mph

The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is September (6.2mph).

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Average humidity in September
Pendleton, OR

Average humidity in September - Pendleton, OR
  • Average humidity in September: 46%

The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (38%).

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Average rainfall in September
Pendleton, OR

Average rainfall in September - Pendleton, OR
  • Average rainfall in September: 0.51"

The wettest month (with the highest rainfall) is March (1.65").
The driest month (with the least rainfall) is July (0.24").

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Average rainfall days in September
Pendleton, OR

Average rainfall days in September - Pendleton, OR
  • Average rainfall days in September: 7 days

The month with the highest number of rainy days is March (17.1 days).
The month with the least rainy days is August (3.6 days).

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Average snowfall in September
Pendleton, OR

Average snowfall in September - Pendleton, OR
  • Average snowfall in September: 0.08"

The month with the highest snowfall is February (3.62").
The months with the least snowfall are May, June, July, August and October (0").

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Average snowfall days in September
Pendleton, OR

Average snowfall days in September - Pendleton, OR
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is December (5.5 days).
The months with the least snowfall days are May, June, July, August and October (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in September: 10h and 4min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).

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Average sunshine days in September
Pendleton, OR

Average sunshine days in September - Pendleton, OR
  • Average sunshine days in September: 21.1 days

The month with the most sunshine days is July (24.4 days).
The month with the least sunshine days is March (11.7 days).

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Average UV index in September
Pendleton, OR

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

The month with the highest UV index is July (UV index 7).
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
Pendleton, OR

Average cloud cover in September - Pendleton, OR
  • Average cloud cover in September: 16

The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 9).

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Average visibility in September
Pendleton, OR

Average visibility in September - Pendleton, OR
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Pendleton, Oregon, USA

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