Kittitas County (Snoqualmie Pass)
September
Weather in Kittitas County, Washington for September 2027
Your guide to Kittitas County weather in September - trends and predictions
Kittitas County experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 107.4 mm.
Is September a good time to visit Kittitas County? check out the best time to travel to Kittitas County page.
✨ Is September a good time to visit Kittitas County? – Ask the AI Weatherman
Rain 🌧️
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22
Dry days
8
Rainy days
0
Snow days
18°/8°
Temperatures
11 km/h
Avg max wind
69 %
Avg humidity
Kittitas County Weather September
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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
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Mist | 20° /11° | 0.2 mm | 4 | |
| Sept. 2 |  Moderate rain | 23° /11° | 11.3 mm | 5 | |
| Sept. 3 |  Thundery outbreaks possible | 22° /12° | 12.9 mm | 5 | |
| Sept. 4 |  Cloudy | 23° /13° | 0.4 mm | 4 | |
| Sept. 5 | Moderate rain | 20° /12° | 17 mm | 5 | |
| Sept. 6 | Thundery outbreaks possible | 21° /12° | 0 mm | 5 | |
| Sept. 7 | Moderate rain | 15° /9° | 7 mm | 2 | |
| Sept. 8 | Mist | 18° /9° | 0 mm | 4 | |
| Sept. 9 |  Moderate rain at times | 18° /10° | 9.8 mm | 3 | |
| Sept. 10 | Mist | 17° /10° | 0 mm | 2 | |
| Sept. 11 | Mist | 14° /8° | 0 mm | 2 | |
| Sept. 12 |  Patchy rain possible | 15° /9° | 1.2 mm | 2 | |
| Sept. 13 | Moderate rain | 16° /8° | 16.8 mm | 4 | |
| Sept. 14 |  Light rain | 13° /6° | 3.9 mm | 2 | |
| Sept. 15 | Patchy rain possible | 17° /6° | 1.5 mm | 3 | |
| Sept. 16 |  Sunny | 21° /9° | 0 mm | 5 | |
| Sept. 17 | Sunny | 24° /11° | 0 mm | 5 | |
| Sept. 18 | Mist | 19° /8° | 0 mm | 5 | |
| Sept. 19 | Sunny | 23° /9° | 0 mm | 5 | |
| Sept. 20 | Cloudy | 21° /8° | 0 mm | 4.9 | |
| Sept. 21 | Light rain | 17° /7° | 3.9 mm | 3 | |
| Sept. 22 | Mist | 16° /5° | 0 mm | 4 | |
| Sept. 23 | Sunny | 18° /7° | 0 mm | 3 | |
| Sept. 24 | Sunny | 20° /9° | 0.3 mm | 3 | |
| Sept. 25 | Light rain | 12° /5° | 5.8 mm | 2 | |
| Sept. 26 |  Overcast | 14° /2° | 0 mm | 4 | |
| Sept. 27 | Overcast | 18° /5° | 0 mm | 4 | |
| Sept. 28 | Overcast | 17° /7° | 0.1 mm | 3 | |
| Sept. 29 | Moderate rain | 11° /8° | 10.5 mm | 1 | |
| Sept. 30 | Light rain | 13° /6° | 4.6 mm | 2 | |
| 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.
Change Month
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 18° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Kittitas County during September?
Significant rainfall exceeding 107.4 mm is expected in Kittitas County during September, occurring over more than 8 days. Preparing for wet conditions is recommended in your planning.
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.
September rainfall patterns in Kittitas County
Explore the daily rainfall trends and prepare for Kittitas Countys September weather 💧
Typically, Kittitas County has 8 rainy days in September with a total of 107.4 mm of rainfall.
UV exposure in Kittitas County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Kittitas County
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