September weather forecast
Mukilteo, WA

White buildings in neat, green fields near the iconic Mukilteo Lighthouse, Washington
White buildings in neat, green fields near the iconic Mukilteo Lighthouse, Washington

Weather in September

The first month of the autumn, September, is also an enjoyable month in Mukilteo, Washington, with average temperature ranging between min 51.4°F (10.8°C) and max 67.1°F (19.5°C).

Temperature

In September, the average high-temperature slightly decreases, from a pleasant 72.7°F (22.6°C) in August, to a comfortable 67.1°F (19.5°C). In Mukilteo, Washington, in September, the average low-temperature is 51.4°F (10.8°C).

Humidity

In September, the average relative humidity is 77%.

Rainfall

In Mukilteo, during September, the rain falls for 11.3 days and regularly aggregates up to 1.5" (38mm) of precipitation. In Mukilteo, during the entire year, the rain falls for 173.1 days and collects up to 26.02" (661mm) of precipitation.

Snowfall

In Mukilteo, Washington, snow does not fall in May through October.

Ocean temperature

In September, the average ocean temperature in Mukilteo is 53.2°F (11.8°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

The average length of the day in Mukilteo is 12.5h.

Sunshine

In September, the average sunshine is 9.4h.

UV index

In Mukilteo, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. 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 Mukilteo?

The average relative humidity in September in Mukilteo is 77%.

How much does it rain in Mukilteo in September?

In Mukilteo, Washington, in September, it is raining for 11.3 days, with typically 1.5" (38mm) of accumulated precipitation.

When it does not snow in Mukilteo?

In Mukilteo, Washington, snow does not fall in May through October.

What is the water temperature in September in Mukilteo?

In September, the average ocean temperature in Mukilteo is 53.2°F (11.8°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

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

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

How many hours of sunshine does Mukilteo have in September?

In September, the average sunshine in Mukilteo is 9.4h.

What is the UV index intensity in September in Mukilteo?

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

Average temperature in September
Mukilteo, WA

Average temperature in September - Mukilteo, WA
  • Average high temperature in September: 67.1°F

The warmest month (with the highest average high temperature) is August (72.7°F).
The month with the lowest average high temperature is December (42.6°F).

  • Average low temperature in September: 51.4°F

The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (35.4°F).

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Average pressure in September
Mukilteo, WA

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

The month with the highest atmospheric pressure is January (30.09").
Months with the lowest atmospheric pressure are March, August and September (30.01").

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Average wind speed in September
Mukilteo, WA

Average wind speed in September - Mukilteo, WA
  • Average wind speed in September: 4.2mph

The windiest month (with the highest average wind speed) is November (6.2mph).
The calmest month (with the lowest average wind speed) is August (3.6mph).

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Average humidity in September
Mukilteo, WA

Average humidity in September - Mukilteo, WA
  • Average humidity in September: 77%

Months with the highest relative humidity are February and December (84%).
The month with the lowest relative humidity is July (72%).

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Average rainfall in September
Mukilteo, WA

Average rainfall in September - Mukilteo, WA
  • Average rainfall in September: 1.5"

The wettest month (with the highest rainfall) is December (3.54").
The driest month (with the least rainfall) is July (0.43").

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Average rainfall days in September
Mukilteo, WA

Average rainfall days in September - Mukilteo, WA
  • Average rainfall days in September: 11.3 days

The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (6.3 days).

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Average snowfall in September
Mukilteo, WA

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

The month with the highest snowfall is February (4.61").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Mukilteo, WA

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

The month with the highest number of snowfall days is February (5.2 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in September
Mukilteo, WA

Average sea temperature in September - Mukilteo, WA
  • Average sea temperature in September: 53.3°F

The best month for swimming (with the highest average sea temperature) is August (53.5°F).
The coldest month (with the lowest average sea temperature) is February (45.3°F).

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

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

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in September: 9.4h

The month with the most sunshine is August (Average sunshine: 10.7h).
The month with the least sunshine is January (Average sunshine: 4.4h).

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Average sunshine days in September
Mukilteo, WA

Average sunshine days in September - Mukilteo, WA
  • Average sunshine days in September: 16.5 days

The month with the most sunshine days is August (22.6 days).
The month with the least sunshine days is November (9.1 days).

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Average UV index in September
Mukilteo, WA

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

The month with the highest UV index is July (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
Mukilteo, WA

Average cloud cover in September - Mukilteo, WA
  • Average cloud cover in September: 32

The month with the most cloud cover is December (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 25).

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Average visibility in September
Mukilteo, WA

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

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

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