September weather forecast
Lake Stevens, WA

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Weather in September

The first month of the autumn, September, is also an enjoyable month in Lake Stevens, Washington, with an average temperature varying between 50°F (10°C) and 67.1°F (19.5°C).

Temperature

In Lake Stevens, the average high-temperature in September slightly decreases from a pleasant 73°F (22.8°C) in August to an enjoyable 67.1°F (19.5°C). The nighttime temperature in Lake Stevens, during September, averages of 50°F (10°C).

Humidity

In Lake Stevens, the average relative humidity in September is 77%.

Rainfall

In September, in Lake Stevens, the rain falls for 12.3 days. Throughout September, 1.77" (45mm) of precipitation is accumulated. In Lake Stevens, during the entire year, the rain falls for 179.1 days and collects up to 29.57" (751mm) of precipitation.

Snowfall

In Lake Stevens, snow does not fall in May through October.

Daylight

In Lake Stevens, the average length of the day in September is 12h and 33min.
On the first day of September, sunrise is at 6:27 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:48 pm PDT.

Sunshine

In September, the average sunshine in Lake Stevens is 9.2h.

UV index

In Lake Stevens, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the UV index of 3 transforms into the following advice:
Take necessary precautions - Defending against sun damage is advocated. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in Lake Stevens in September?

The high-temperature during September is 67.1°F (19.5°C) and the low-temperature is 50°F (10°C).

What is the average humidity in September in Lake Stevens?

In September, the average relative humidity in Lake Stevens, Washington, is 77%.

How much does it rain in Lake Stevens in September?

In Lake Stevens, Washington, in September, during 12.3 rainfall days, 1.77" (45mm) of precipitation is typically accumulated.

When it does not snow in Lake Stevens?

In Lake Stevens, snow does not fall in May through October.

What is the average length of the day in September in Lake Stevens?

In Lake Stevens, the average day length in September is 12h and 33min.

What time are sunrise and sunset in September in Lake Stevens?

In September, on the first day of the month, sunrise is at 6:27 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:48 pm PDT.

How many hours of sunshine does Lake Stevens have in September?

In Lake Stevens, the average sunshine duration in September is 9.2h.

What is the UV index intensity in September in Lake Stevens?

The average daily maximum UV index in September is 3. A UV Index estimate 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
Lake Stevens, WA

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

The warmest month (with the highest average high temperature) is August (73°F).
The month with the lowest average high temperature is December (42.3°F).

  • Average low temperature in September: 50°F

The month with the highest average low temperature is August (52.5°F).
The coldest month (with the lowest average low temperature) is December (34.7°F).

Average pressure in September
Lake Stevens, WA

Average pressure in September - Lake Stevens, WA
  • Average pressure in September: 30.01"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

Average wind speed in September
Lake Stevens, WA

Average wind speed in September - Lake Stevens, WA
  • Average wind speed in September: 4mph

The windiest months (with the highest average wind speed) are March and November (5.8mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).

Average humidity in September
Lake Stevens, WA

Average humidity in September - Lake Stevens, WA
  • Average humidity in September: 77%

The months with the highest relative humidity are January and December (85%).
The month with the lowest relative humidity is July (73%).

Average rainfall in September
Lake Stevens, WA

Average rainfall in September - Lake Stevens, WA
  • Average rainfall in September: 1.77"

The wettest month (with the highest rainfall) is November (4.06").
The driest month (with the least rainfall) is July (0.47").

Average rainfall days in September
Lake Stevens, WA

Average rainfall days in September - Lake Stevens, WA
  • Average rainfall days in September: 12.3 days

The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (6.1 days).

Average snowfall in September
Lake Stevens, WA

Average snowfall in September - Lake Stevens, WA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (2.68").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Lake Stevens, WA

Average snowfall days in September - Lake Stevens, WA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (3.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Lake Stevens, WA

Average daylight in September / Average sunshine in September - Lake Stevens, WA
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are January and December (Average sunshine: 4h and 12min).

Average sunshine days in September
Lake Stevens, WA

Average sunshine days in September - Lake Stevens, WA
  • Average sunshine days in September: 16.1 days

The month with the most sunshine days is August (23.1 days).
The months with the least sunshine days are February and November (8.6 days).

Average UV index in September
Lake Stevens, WA

Average UV index in September - Lake Stevens, WA
  • Average UV index in September: 3

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

Average cloud cover in September
Lake Stevens, WA

Average cloud cover in September - Lake Stevens, WA
  • Average cloud cover in September: 34

The month with the most cloud cover is December (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 26).

Average visibility in September
Lake Stevens, WA

Average visibility in September - Lake Stevens, WA
  • Average visibility in September: 6mi

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

Lake Stevens, Washington, USA

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