September weather forecastEverett, WA

The large Snohomish River flowing near the city of Everett in Washington

September

Weather in September

The arrival of autumn in Everett, Washington is marked by cooler temperatures and increased rainfall in September. This month retains certain characteristics of summer, while slowly adopting the traits of the impending season. Rainfall, registering 1.77" (45mm), reintroduces itself steadfastly, although not quite reaching the volume of the wetter months to come. The city witnesses a significant decline in daylight hours and a corresponding decrease in sunshine duration. As Everett transitions into October, the city braces itself for colder temperatures and substantially increased rainfall.

Temperature

A subtle change in temperatures is noted in Everett as August gives way to September, with average highs reducing from a pleasant 73°F (22.8°C) to an enjoyable 67.1°F (19.5°C). During September, the nighttime temperature averages of 50°F (10°C).

Humidity

The average relative humidity in September is 77%.

Rainfall

In Everett, in September, it is raining for 12.3 days, with typically 1.77" (45mm) of accumulated precipitation. Throughout the year, there are 179.1 rainfall days, and 29.57" (751mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in Everett.

Ocean temperature

In September, the average ocean temperature is 53.2°F (11.8°C).
Note: Taking a dip in 53.2°F (11.8°C) can be perilous. Submersion in temperatures under 50°F (10°C) triggers severe cold shock accompanied by hyperventilation.

Daylight

In September, the average length of the day is 12h and 33min.
On the first day of the month, sunrise is at 6:28 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:07 am and sunset at 6:49 pm PDT.

Sunshine

In Everett, Washington, the average sunshine in September is 9.2h.

UV index

In Everett, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 3 in September interprets into the following advice:
Be vigilant - Suggestions to stave off sun damage are provided. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.

Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The average high-temperature, in September, in Everett, is 67.1°F (19.5°C), while the average low-temperature is 50°F (10°C).

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

In Everett, in September, it is raining for 12.3 days, with typically 1.77" (45mm) of accumulated precipitation.

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

In Everett, Washington, the average seawater temperature in September is 53.2°F (11.8°C). Swimming in 53.2°F (11.8°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

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

On the first day of September in Everett, sunrise is at 6:28 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:49 pm PDT.

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

The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium health risk from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

73°F

67.1°F

57°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

4.1mph

4.3mph

5.3mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

6.1

12.3

15.8

Average snowfall

Average snowfall days

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

23.1

16.1

13.8

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Everett, 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
Everett, 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
Everett, 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
Everett, 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
Everett, 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
Everett, 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
Everett, 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
Everett, 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 sea temperature in September
Everett, 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).

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

Average daylight in September: 12h and 36min

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 12min

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
Everett, 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
Everett, 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
Everett, 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
Everett, 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).