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Snohomish County (Everett)
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United States weather

Weather in Snohomish County, Washington for September 2026

Your guide to Snohomish County weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Snohomish County has been nearly identical to the historical average, with a temperature of 21.6 °F (showing only a slight deviation of 0.5 °F).

  • The forecast for the upcoming days in Snohomish County predicts a temperature of 17.1 °F, which is slightly above the historical average.

  • In general, the average temperature in Snohomish County at the beginning of September is 23.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.3 °F by the end of September.

    • Rain 🌧️

  • Snohomish County experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 72.9 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
19°/11°
Temperatures
Average wind speed
10 km/h
Avg max wind
Average humidity
82 %
Avg humidity

Snohomish County Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Partly cloudy
23°
2
Fog
22°
3
Patchy rain possible
22°
4
Overcast
24°
5
Sunny
28°
6
Sunny
26°
7
Partly cloudy
22°
8
Sunny
24°
9
Fog
22°
10
Patchy rain possible
20°
11
Light rain
16°
12
Fog
19°
13
Mist
17°
14
Light rain shower
18°
15
Fog
19°
16
Mist
24°
17
Partly cloudy
20°
18
Fog
17°
19
Mist
18°
20
Mist
19°
21
Mist
21°
22
Patchy rain possible
17°
23
Overcast
19°
24
Overcast
15°
25
Light rain
15°
26
Overcast
17°
27
Patchy rain possible
12°
28
Patchy rain possible
17°
29
Patchy rain possible
15°
30
Sunny
16°

Temperatures trend during September in Snohomish County

See the weather trend as well as the moving average line

September weather in Snohomish County day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Partly cloudy
Partly cloudy
 23° /13° 0 mm 5
Sept. 2 Fog
Fog
 22° /12° 10.1 mm 4
Sept. 3 Patchy rain possible
Patchy rain possible
 22° /12° 0 mm 4
Sept. 4 Overcast
Overcast
 24° /12° 0 mm 4
Sept. 5 Sunny
Sunny
 28° /13° 0.1 mm 7
Sept. 6 Sunny
Sunny
 26° /13° 0 mm 6
Sept. 7 Partly cloudy
Partly cloudy
 22° /13° 13 mm 4
Sept. 8 Sunny
Sunny
 24° /12° 0 mm 5
Sept. 9 Fog
Fog
 22° /11° 0 mm 4
Sept. 10 Patchy rain possible
Patchy rain possible
 20° /12° 0.1 mm 4
Sept. 11 Light rain
Light rain
 16° /11° 1.3 mm 3
Sept. 12 Fog
Fog
 19° /10° 0.5 mm 3
Sept. 13 Mist
Mist
 17° /10° 3.8 mm 3
Sept. 14 Light rain shower
Light rain shower
 18° /11° 2.6 mm 3
Sept. 15 Fog
Fog
 19° /10° 0.1 mm 4
Sept. 16 Mist
Mist
 24° /9° 0 mm 5
Sept. 17 Partly cloudy
Partly cloudy
 20° /11° 0 mm 4
Sept. 18 Fog
Fog
 17° /11° 0 mm 4
Sept. 19 Mist
Mist
 18° /9° 0 mm 3
Sept. 20 Mist
Mist
 19° /9° 0 mm 4
Sept. 21 Mist
Mist
 21° /9° 0 mm 4.1
Sept. 22 Patchy rain possible
Patchy rain possible
 17° /10° 0.2 mm 1
Sept. 23 Overcast
Overcast
 19° /8° 0 mm 3.6
Sept. 24 Overcast
Overcast
 15° /9° 10.5 mm 2.1
Sept. 25 Light rain
Light rain
 15° /8° 24 mm 3.3
Sept. 26 Overcast
Overcast
 17° /7° 0 mm 4
Sept. 27 Patchy rain possible
Patchy rain possible
 12° /9° 4.4 mm 3
Sept. 28 Patchy rain possible
Patchy rain possible
 17° /10° 0.2 mm 5
Sept. 29 Patchy rain possible
Patchy rain possible
 15° /8° 3.6 mm 4
Sept. 30 Sunny
Sunny
 16° /7° 0 mm 5
Next
Important Notice
Our weather forecast for Snohomish County in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Snohomish County forecast closer to your planned date for the most up-to-date weather information.
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Snohomish County in September - FAQ

What are the expected maximum and minimum temperatures in Snohomish County during September?
Enjoy moderate daytime temperatures of up to 19° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Snohomish County during September?
Moderate rainfall is anticipated in Snohomish County during September, with a total of 72.9 mm spread over approximately 8 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Snohomish County during September?
The average wind speed in Snohomish County during September is 10 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Snohomish County

Explore the daily rainfall trends and prepare for Snohomish Countys September weather 💧
Typically, Snohomish County has 8 rainy days in September with a total of 72.9 mm of rainfall.

UV exposure in Snohomish County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Everett
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Location coordinates Where is Snohomish County?

Get accurate weather forecasts for Snohomish County, located at latitude 47.979 and longitude -122.202. Stay updated with localized weather information tailored for Snohomish County.

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