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Chelan County (Wenatchee)
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United States weather

Weather in Chelan County, Washington for September 2027

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

    Temperatures

  • In general, the average temperature in Chelan County at the beginning of September is 30.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.7 °C by the end of September.

    • Rain 🌧️

  • With an average of 2 rainy days, Chelan County experiences minimal rainfall in September.

    • More

  • Is September a good time to visit Chelan County? check out the best time to travel to Chelan County page.

  • ✨ Is September a good time to visit Chelan County? – Ask the AI Weatherman

Average dry days
28
Dry days
Average rainy days
2
Rainy days
Average snowy days
0
Snow days
Average temperatures
25°/10°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
49 %
Avg humidity

Chelan County Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Overcast
34°
2
Patchy rain possible
32°
3
Patchy rain possible
30°
4
Sunny
30°
5
Sunny
30°
6
Overcast
31°
7
Cloudy
29°
8
Partly cloudy
30°
9
Partly cloudy
26°
10
Partly cloudy
29°
11
Patchy rain possible
25°
12
Partly cloudy
25°
13
Light rain
22°
14
Partly cloudy
21°
15
Sunny
21°
16
Sunny
25°
17
Sunny
26°
18
Sunny
25°
19
Sunny
27°
20
Sunny
25°
21
Overcast
23°
22
Overcast
23°
23
Partly cloudy
25°
24
Sunny
26°
25
Patchy rain possible
22°
26
Cloudy
19°
27
Partly cloudy
21°
28
Overcast
22°
29
Partly cloudy
17°
30
Sunny
17°

Temperatures trend during September in Chelan County

See the weather trend as well as the moving average line

September weather in Chelan County day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Overcast
Overcast
 34° /15° 0 mm 6
Sept. 2 Patchy rain possible
Patchy rain possible
 32° /13° 2.4 mm 6
Sept. 3 Patchy rain possible
Patchy rain possible
 30° /13° 1.2 mm 6.4
Sept. 4 Sunny
Sunny
 30° /13° 0.2 mm 6.4
Sept. 5 Sunny
Sunny
 30° /13° 0 mm 6.3
Sept. 6 Overcast
Overcast
 31° /14° 0 mm 6
Sept. 7 Cloudy
Cloudy
 29° /14° 0 mm 5
Sept. 8 Partly cloudy
Partly cloudy
 30° /12° 0 mm 6
Sept. 9 Partly cloudy
Partly cloudy
 26° /11° 0 mm 5
Sept. 10 Partly cloudy
Partly cloudy
 29° /11° 0 mm 5
Sept. 11 Patchy rain possible
Patchy rain possible
 25° /10° 0 mm 5
Sept. 12 Partly cloudy
Partly cloudy
 25° /9° 0.7 mm 4
Sept. 13 Light rain
Light rain
 22° /8° 8.8 mm 5
Sept. 14 Partly cloudy
Partly cloudy
 21° /8° 0 mm 5
Sept. 15 Sunny
Sunny
 21° /6° 0.3 mm 5
Sept. 16 Sunny
Sunny
 25° /8° 0 mm 5.3
Sept. 17 Sunny
Sunny
 26° /10° 0 mm 5.2
Sept. 18 Sunny
Sunny
 25° /10° 0 mm 5.1
Sept. 19 Sunny
Sunny
 27° /10° 0 mm 5
Sept. 20 Sunny
Sunny
 25° /10° 0 mm 4.9
Sept. 21 Overcast
Overcast
 23° /8° 0 mm 4.8
Sept. 22 Overcast
Overcast
 23° /6° 0 mm 4.7
Sept. 23 Partly cloudy
Partly cloudy
 25° /10° 0 mm 4.6
Sept. 24 Sunny
Sunny
 26° /10° 0 mm 4.5
Sept. 25 Patchy rain possible
Patchy rain possible
 22° /11° 2.3 mm 4.5
Sept. 26 Cloudy
Cloudy
 19° /6° 0.1 mm 4.4
Sept. 27 Partly cloudy
Partly cloudy
 21° /8° 0 mm 4.3
Sept. 28 Overcast
Overcast
 22° /7° 0 mm 4.2
Sept. 29 Partly cloudy
Partly cloudy
 17° /6° 0.2 mm 4
Sept. 30 Sunny
Sunny
 17° /6° 0 mm 4
Next
Important Notice
Our weather forecast for Chelan 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 Chelan County forecast closer to your planned date for the most up-to-date weather information.
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Chelan County in September - FAQ

What are the expected maximum and minimum temperatures in Chelan County during September?
Enjoy moderate daytime temperatures of up to 25° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Chelan County during September?
Expect minimal rainfall in Chelan County during September, with a total of 16.3 mm over approximately 2 days. This minimal precipitation is unlikely to significantly impact plans.

What are the typical wind conditions in Chelan County during September?
The average wind speed in Chelan County during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Chelan County

Explore the daily rainfall trends and prepare for Chelan Countys September weather 💧
Typically, Chelan County has 2 rainy days in September with a total of 16.3 mm of rainfall.

UV exposure in Chelan County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Wenatchee
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