Idaho (Coeur d'Alene)
September
Weather in Idaho for September 2027
Your guide to Idaho weather in September - trends and predictions
In general, the average temperature in Idaho at the beginning of September is 28.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20 °C by the end of September.
Idaho experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 94.1 mm.
Is September a good time to visit Idaho? check out the best time to travel to Idaho page.
✨ Is September a good time to visit Idaho? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
23
Dry days
7
Rainy days
0
Snow days
23°/12°
Temperatures
11 km/h
Avg max wind
51 %
Avg humidity
Idaho Weather September
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What’s the Weather Like in Idaho This September?
Discover the average temperatures and weather trends across Idaho’s cities this September.
Temperatures trend during September in Idaho
See the weather trend as well as the moving average line
September weather in Idaho day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Partly cloudy | 33° /16° | 0 mm | 6 | |
| Sept. 2 |  Moderate rain | 29° /15° | 12.9 mm | 6 | |
| Sept. 3 | Moderate rain | 26° /16° | 14.3 mm | 5 | |
| Sept. 4 | Moderate rain | 26° /15° | 20.8 mm | 5 | |
| Sept. 5 |  Sunny | 28° /12° | 0 mm | 6.2 | |
| Sept. 6 | Sunny | 30° /12° | 0.5 mm | 6 | |
| Sept. 7 | Moderate rain | 26° /15° | 15.5 mm | 5 | |
| Sept. 8 |  Light rain | 28° /12° | 3.5 mm | 5.9 | |
| Sept. 9 | Partly cloudy | 26° /14° | 0.9 mm | 5.8 | |
| Sept. 10 |  Patchy rain possible | 26° /13° | 1.4 mm | 5 | |
| Sept. 11 | Light rain | 20° /12° | 4 mm | 4 | |
| Sept. 12 | Patchy rain possible | 21° /11° | 1.7 mm | 3 | |
| Sept. 13 | Light rain | 21° /11° | 3 mm | 4 | |
| Sept. 14 | Light rain | 18° /9° | 3.7 mm | 4 | |
| Sept. 15 |  Overcast | 19° /9° | 0.9 mm | 4 | |
| Sept. 16 | Sunny | 24° /9° | 0 mm | 5.2 | |
| Sept. 17 | Light rain | 22° /13° | 2.6 mm | 5 | |
| Sept. 18 | Overcast | 24° /12° | 0 mm | 5 | |
| Sept. 19 |  Cloudy | 25° /13° | 0 mm | 4.9 | |
| Sept. 20 | Sunny | 23° /12° | 0 mm | 4.8 | |
| Sept. 21 | Overcast | 22° /10° | 0.5 mm | 4.8 | |
| Sept. 22 | Overcast | 20° /11° | 0.7 mm | 4 | |
| Sept. 23 | Sunny | 23° /10° | 0 mm | 4.6 | |
| Sept. 24 | Sunny | 26° /12° | 0 mm | 4.5 | |
| Sept. 25 | Light rain | 23° /12° | 2.6 mm | 4.4 | |
| Sept. 26 | Cloudy | 17° /7° | 0 mm | 4 | |
| Sept. 27 | Overcast | 19° /8° | 0 mm | 4 | |
| Sept. 28 | Cloudy | 22° /10° | 0 mm | 4.1 | |
| Sept. 29 | Patchy rain possible | 17° /10° | 0.3 mm | 3 | |
| Sept. 30 | Light rain | 16° /8° | 4.2 mm | 3 | |
| Next | |||||
Important Notice
Our weather forecast for Idaho 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 Idaho forecast closer to your planned date for the most up-to-date weather information.
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Idaho in September - FAQ
What are the expected maximum and minimum temperatures in Idaho during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Idaho during September?
Moderate rainfall is anticipated in Idaho during September, with a total of 94.1 mm spread over approximately 7 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Idaho during September?
The average wind speed in Idaho during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Idaho
Explore the daily rainfall trends and prepare for Idahos September weather 💧
Typically, Idaho has 7 rainy days in September with a total of 94.1 mm of rainfall.
UV exposure in Idaho during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Counties in Idaho
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