Kootenai County (Coeur d'Alene)
September
Weather in Kootenai County, Idaho for September 2026
Your guide to Kootenai County weather in September - trends and predictions
Until now, September 2026 in Kootenai County is cooler than usual, with temperatures averaging 20.7 °F, this is 4.3 °F below the typical seasonal average.
The forecast for the next days in Kootenai County predicts temperatures to be around 17 °F, close to the historical average.
In general, the average temperature in Kootenai County at the beginning of September is 28.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.1 °F by the end of September.
Kootenai County experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 32.9 mm.
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Temperatures
Rain 🌧️
More
20
Dry days
10
Rainy days
0
Snow days
25°/13°
Temperatures
11 km/h
Avg max wind
47 %
Avg humidity
Kootenai County Weather September
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Temperatures trend during September in Kootenai County
See the weather trend as well as the moving average line
September weather in Kootenai County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Partly cloudy | 34° /15° | 0 mm | 6 | |
| Sept. 2 | Partly cloudy | 29° /14° | 12.9 mm | 6 | |
| Sept. 3 |  Cloudy | 27° /15° | 14.3 mm | 5 | |
| Sept. 4 |  Sunny | 26° /14° | 20.8 mm | 5 | |
| Sept. 5 | Sunny | 29° /11° | 0 mm | 7 | |
| Sept. 6 | Sunny | 30° /12° | 0.5 mm | 6 | |
| Sept. 7 |  Overcast | 26° /15° | 15.5 mm | 5 | |
| Sept. 8 | Partly cloudy | 28° /12° | 3.5 mm | 6 | |
| Sept. 9 | Partly cloudy | 26° /13° | 0.9 mm | 6 | |
| Sept. 10 | Partly cloudy | 26° /13° | 1.4 mm | 5 | |
| Sept. 11 |  Moderate rain at times | 20° /12° | 4 mm | 4 | |
| Sept. 12 |  Heavy rain at times | 21° /11° | 1.7 mm | 3 | |
| Sept. 13 | Cloudy | 21° /10° | 3 mm | 4 | |
| Sept. 14 |  Patchy rain possible | 18° /9° | 3.7 mm | 4 | |
| Sept. 15 | Overcast | 19° /9° | 0.9 mm | 4 | |
| Sept. 16 | Sunny | 24° /9° | 0 mm | 6 | |
| Sept. 17 | Heavy rain at times | 22° /12° | 2.6 mm | 5 | |
| Sept. 18 | Overcast | 24° /12° | 0 mm | 6 | |
| Sept. 19 | Cloudy | 25° /12° | 0 mm | 6 | |
| Sept. 20 | Sunny | 24° /12° | 0 mm | 5 | |
| Sept. 21 | Sunny | 26° /13° | 0 mm | 4.7 | |
| Sept. 22 | Overcast | 21° /14° | 0 mm | 4 | |
| Sept. 23 | Overcast | 20° /11° | 0 mm | 4.2 | |
| Sept. 24 | Overcast | 24° /10° | 0 mm | 4.3 | |
| Sept. 25 | Patchy rain possible | 17° /7° | 9.5 mm | 1.8 | |
| Sept. 26 | Sunny | 13° /2° | 0 mm | 4 | |
| Sept. 27 | Overcast | 14° /5° | 0.1 mm | 3 | |
| Sept. 28 | Patchy rain possible | 11° /4° | 0.3 mm | 4 | |
| Sept. 29 | Light rain shower | 11° /3° | 11.8 mm | 3 | |
| Sept. 30 |  Mist | 9° /2° | 0.3 mm | 3 | |
| Next | |||||
Important Notice
Our weather forecast for Kootenai 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 Kootenai County forecast closer to your planned date for the most up-to-date weather information.
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Kootenai County in September - FAQ
What are the expected maximum and minimum temperatures in Kootenai County during September?
Enjoy moderate daytime temperatures of up to 25° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Kootenai County during September?
In September, Kootenai County can expect light to moderate rainfall, totaling 32.9 mm across approximately 10 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Kootenai County during September?
The average wind speed in Kootenai County during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Kootenai County
Explore the daily rainfall trends and prepare for Kootenai Countys September weather 💧
Typically, Kootenai County has 10 rainy days in September with a total of 32.9 mm of rainfall.
UV exposure in Kootenai County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Kootenai County?Get accurate weather forecasts for Kootenai County, located at latitude 47.678 and longitude -116.78. Stay updated with localized weather information tailored for Kootenai County.
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