September weather forecast and climate
Burien, WA

Weather in September

The first month of the autumn, September, is also an agreeable month in Burien, Washington, with average temperature varying between 50.4°F (10.2°C) and 70.3°F (21.3°C).

Temperature

In Burien, the average high-temperature marginally drops, from a warm 77.7°F (25.4°C) in August, to an agreeable 70.3°F (21.3°C). The average low-temperature, in Burien, is 50.4°F (10.2°C).

Humidity

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

Rainfall

In Burien, it is raining for 10.5 days, with typically 0.91" (23mm) of accumulated precipitation. In Burien, during the entire year, the rain falls for 138.2 days and collects up to 14.09" (358mm) of precipitation.

Snowfall

In Burien snow does not fall in April through October.

Daylight

In Burien, the average length of the day is 12.5h.

Sunshine

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

UV index

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Burien?

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

How much does it rain in Burien in September?

In September, the rain falls for 10.5 days. Throughout September, 0.91" (23mm) of precipitation is accumulated.

When it does not snow in Burien?

April through October are months without snowfall.

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

In Burien, Washington, the average length of the day in September is 12.5h.

How many hours of sunshine does Burien have in September?

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

What is the UV index intensity in September in Burien?

In Burien, Washington, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV radiation.

Average temperature in September
Burien, WA

Average temperature in September - Burien, WA
  • Average high temperature in September: 70.3°F

The warmest month (with the highest average high temperature) is August (77.7°F).
The month with the lowest average high temperature is December (43.5°F).

  • Average low temperature in September: 50.4°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 (34.3°F).

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Average pressure in September
Burien, WA

Average pressure in September - Burien, WA
  • Average pressure in September: 30.01"

The month with the highest atmospheric pressure is January (30.1").
Months with the lowest atmospheric pressure are March, August and September (30.01").

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Average wind speed in September
Burien, WA

Average wind speed in September - Burien, WA
  • Average wind speed in September: 3.9mph

The windiest month (with the highest average wind speed) is March (5.3mph).
The calmest months (with the lowest average wind speed) are July and August (3.6mph).

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Average humidity in September
Burien, WA

Average humidity in September - Burien, WA
  • Average humidity in September: 74%

Months with the highest relative humidity are January and December (85%).
The month with the lowest relative humidity is July (68%).

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Average rainfall in September
Burien, WA

Average rainfall in September - Burien, WA
  • Average rainfall in September: 0.91"

The wettest month (with the highest rainfall) is December (2.2").
The driest month (with the least rainfall) is July (0.31").

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Average rainfall days in September
Burien, WA

Average rainfall days in September - Burien, WA
  • Average rainfall days in September: 10.5 days

The month with the highest number of rainy days is April (14.9 days).
The month with the least rainy days is August (5.7 days).

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Average snowfall in September
Burien, WA

Average snowfall in September - Burien, WA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (2.52").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Burien, WA

Average snowfall days in September - Burien, WA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (3.4 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Burien, WA

Average daylight in September / Average sunshine in September - Burien, WA
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in September: 9.2h

The month with the most sunshine is August (Average sunshine: 10.7h).
The month with the least sunshine is December (Average sunshine: 4.1h).

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Average sunshine days in September
Burien, WA

Average sunshine days in September - Burien, WA
  • Average sunshine days in September: 17.4 days

The month with the most sunshine days is August (22.8 days).
The month with the least sunshine days is February (13 days).

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Average UV index in September
Burien, WA

Average UV index in September - Burien, WA
  • Average UV index in September: 4

Months with the highest UV index are June, July and August (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Burien, WA

Average cloud cover in September - Burien, WA
  • Average cloud cover in September: 35

The month with the most cloud cover is December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 26).

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Average visibility in September
Burien, WA

Average visibility in September - Burien, WA
  • Average visibility in September: 6mi

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

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