September weather forecast
Beaverton, OR

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Colored yellow, brown and golden tree colors under a perfect blue, cloudy sky in the fall, mirrored in the calm lake water in Beaverton, Oregon
Colored yellow, brown and golden tree colors under a perfect blue, cloudy sky in the fall, mirrored in the calm lake water in Beaverton, Oregon

Weather in September

The transitional month of September slows down the pace of summer and inches towards autumn. The dry spell finally ends with a significant increase in precipitation to 1.54" (39mm). Warmer temperatures persist, but with a trend of gradual cooling. Hours of daylight start to decline, hinting at the forthcoming fall season. The September weather paints Beaverton in brilliant hues of yellow and brown.

Temperature

Beaverton's weather in September involves a mild decrease in the average high-temperature, moving down slightly from August's warm 81.7°F (27.6°C) to a still moderately hot 74.3°F (23.5°C). September's nights in Beaverton exhibit a sharp contrast from day highs, with an average temperature of 52°F (11.1°C).

Humidity

The average relative humidity in September is 69%.

Rainfall

In September, the rain falls for 10.5 days. Throughout September, 1.54" (39mm) of precipitation is accumulated. In Beaverton, during the entire year, the rain falls for 173.2 days and collects up to 30.55" (776mm) of precipitation.

Snowfall

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

Daylight

In September, the average length of the day in Beaverton 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, sunrise is at 7:09 am and sunset at 6:52 pm PDT.

Sunshine

In September, the average sunshine in Beaverton is 9.2h.

UV index

The average daily maximum UV index in September in Beaverton is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: During September, 4 as the daily maximum UV index converts into the following advice:
Put precautions into practice - Guidance to elude sunburn is provided. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
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Frequently asked questions

What is the usual temperature for Beaverton in September?

An average high-temperature, in September, in Beaverton, is 74.3°F (23.5°C) and the average low-temperature is 52°F (11.1°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines relative humidity and air temperature, is computed to be 84.2°F (29°C).

What is the average humidity in September in Beaverton?

In Beaverton, the average relative humidity in September is 69%.

How much does it rain in Beaverton in September?

In September, in Beaverton, the rain falls for 10.5 days. Throughout September, 1.54" (39mm) of precipitation is accumulated.

When it does not snow in Beaverton?

April through October are months without snowfall.

How many hours of daylight does Beaverton have in September?

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

When are sunrise and sunset in September in Beaverton?

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

How many hours of sunshine does Beaverton have in September?

The average sunshine duration in September in Beaverton is 9.2h.

How high is the UV index in September in Beaverton?

The average daily maximum UV index in September in Beaverton, Oregon, is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability 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
Beaverton, OR

Average temperature in September - Beaverton, OR
  • Average high temperature in September: 74.3°F

The warmest month (with the highest average high temperature) is August (81.7°F).
The month with the lowest average high temperature is December (44.2°F).

  • Average low temperature in September: 52°F

The month with the highest average low temperature is August (55.6°F).
The coldest month (with the lowest average low temperature) is December (34.7°F).

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Average pressure in September
Beaverton, OR

Average pressure in September - Beaverton, 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
Beaverton, OR

Average wind speed in September - Beaverton, OR
  • Average wind speed in September: 4.1mph

The windiest month (with the highest average wind speed) is January (5.4mph).
The calmest month (with the lowest average wind speed) is August (4mph).

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Average humidity in September
Beaverton, OR

Average humidity in September - Beaverton, OR
  • Average humidity in September: 69%

The months with the highest relative humidity are February and December (84%).
The month with the lowest relative humidity is August (63%).

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Average rainfall in September
Beaverton, OR

Average rainfall in September - Beaverton, OR
  • Average rainfall in September: 1.54"

The wettest month (with the highest rainfall) is December (4.61").
The driest month (with the least rainfall) is July (0.31").

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Average rainfall days in September
Beaverton, OR

Average rainfall days in September - Beaverton, OR
  • Average rainfall days in September: 10.5 days

The month with the highest number of rainy days is March (20.6 days).
The month with the least rainy days is August (4.6 days).

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Average snowfall in September
Beaverton, OR

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

The month with the highest snowfall is February (1.61").
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
Beaverton, OR

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

The month with the highest number of snowfall days is February (2.2 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
Beaverton, OR

Average daylight in September / Average sunshine in September - Beaverton, 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: 9h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 54min).

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Average sunshine days in September
Beaverton, OR

Average sunshine days in September - Beaverton, OR
  • Average sunshine days in September: 17.9 days

The month with the most sunshine days is July (24.9 days).
The month with the least sunshine days is March (8.6 days).

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Average UV index in September
Beaverton, OR

Average UV index in September - Beaverton, 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
Beaverton, OR

Average cloud cover in September - Beaverton, OR
  • Average cloud cover in September: 33

The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 23).

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Average visibility in September
Beaverton, OR

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

The months with the highest visibility are July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, June, October, November and December (5mi).

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Beaverton, Oregon, USA

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