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Kittitas County (Snoqualmie Pass)
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United States weather

Weather in Kittitas County, Washington for September 2026

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

    Snow Forecast ❄️

  • Snowfall in Kittitas County during September is quite rare, with fewer than 2 snowy days on average.
    According to Kittitas County snow forecast for September 2026, 1 snowy day is expected until the end of the month at Friday, September 25.

    • Temperatures

  • Until now, September 2026 in Kittitas County is slightly cooler than the historical average by 1.7 °F.

  • The forecast for the upcoming days in Kittitas County predicts a temperature of 14.1 °F, which is slightly above the historical average.

  • In general, the average temperature in Kittitas County at the beginning of September is 20.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 11 °F by the end of September.

    • Rain 🌧️

  • Kittitas County experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 63.2 mm.

    • More

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

Average dry days
24
Dry days
Average rainy days
6
Rainy days
Average snowy days
0
Snow days
Average temperatures
19°/10°
Temperatures
Average wind speed
11 km/h
Avg max wind
Average humidity
69 %
Avg humidity

Kittitas County Weather September

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

Temperatures trend during September in Kittitas County

See the weather trend as well as the moving average line

September weather in Kittitas County day by day

Click on a date for more information
August October
Date Weather Temperatures Rain Snow More
Sept. 1 Mist
Mist
 20° /11° 0.2 mm 0 cm
Sept. 2 Sunny
Sunny
 23° /10° 11.3 mm 0 cm
Sept. 3 Thundery outbreaks possible
Thundery outbreaks possible
 22° /12° 12.9 mm 0 cm
Sept. 4 Cloudy
Cloudy
 23° /12° 0.4 mm 0 cm
Sept. 5 Sunny
Sunny
 20° /11° 17 mm 0 cm
Sept. 6 Thundery outbreaks possible
Thundery outbreaks possible
 21° /12° 0 mm 0 cm
Sept. 7 Moderate rain
Moderate rain
 15° /8° 7 mm 0 cm
Sept. 8 Mist
Mist
 18° /8° 0 mm 0 cm
Sept. 9 Moderate rain at times
Moderate rain at times
 18° /10° 9.8 mm 0 cm
Sept. 10 Mist
Mist
 17° /9° 0 mm 0 cm
Sept. 11 Mist
Mist
 14° /8° 0 mm 0 cm
Sept. 12 Mist
Mist
 15° /8° 1.2 mm 0 cm
Sept. 13 Partly cloudy
Partly cloudy
 16° /7° 16.8 mm 0 cm
Sept. 14 Light rain
Light rain
 13° /6° 3.9 mm 0 cm
Sept. 15 Mist
Mist
 17° /5° 1.5 mm 0 cm
Sept. 16 Sunny
Sunny
 21° /8° 0 mm 0 cm
Sept. 17 Sunny
Sunny
 24° /10° 0 mm 0 cm
Sept. 18 Mist
Mist
 19° /8° 0 mm 0 cm
Sept. 19 Sunny
Sunny
 23° /8° 0 mm 0 cm
Sept. 20 Cloudy
Cloudy
 21° /7° 0 mm 0 cm
Sept. 21 Sunny
Sunny
 24° /9° 0 mm 0 cm
Sept. 22 Patchy rain possible
Patchy rain possible
 15° /5° 0 mm 0 cm
Sept. 23 Overcast
Overcast
 15° /5° 0 mm 0 cm
Sept. 24 Overcast
Overcast
 17° /5° 0.4 mm 0 cm
Sept. 25 Patchy rain possible
Patchy rain possible
 8° /3° 9.6 mm 1 cm
Sept. 26 Overcast
Overcast
 13° /1° 0 mm 0 cm
Sept. 27 Light rain shower
Light rain shower
 6° /5° 6.3 mm 0 cm
Sept. 28 Patchy rain possible
Patchy rain possible
 9° /4° 3.2 mm 0 cm
Sept. 29 Light rain shower
Light rain shower
 10° /4° 5 mm 0 cm
Sept. 30 Sunny
Sunny
 14° /3° 0.1 mm 0 cm
Next
Important Notice
Our weather forecast for Kittitas 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 Kittitas County forecast closer to your planned date for the most up-to-date weather information.
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Kittitas County in September - FAQ

What are the expected maximum and minimum temperatures in Kittitas County during September?
Enjoy moderate daytime temperatures of up to 19° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Kittitas County during September?
Moderate rainfall is anticipated in Kittitas County during September, with a total of 63.2 mm spread over approximately 6 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Kittitas County during September?
The average wind speed in Kittitas County during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.

Kittitas County snow forecast September 2026

Track daily snowfall levels and discover Kittitas County’s snowy potential this September ❄️

September rainfall patterns in Kittitas County

Explore the daily rainfall trends and prepare for Kittitas Countys September weather 💧
Typically, Kittitas County has 6 rainy days in September with a total of 63.2 mm of rainfall.

UV exposure in Kittitas County during September

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

Get accurate weather forecasts for Kittitas County, located at latitude 47.392 and longitude -121.4. Stay updated with localized weather information tailored for Kittitas County.

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