Bonner County (Sandpoint)
September
Weather in Bonner County, Idaho for September 2025
Your guide to Bonner County weather in September - trends and predictions
In general, the average temperature in Bonner County at the beginning of September is 30.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.6 °F by the end of September.
Bonner County experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 28.5 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
24
Dry days
6
Rainy days
0
Snow days
23°/10°
Temperatures
11 km/h
Avg max wind
50 %
Avg humidity
Bonner County Weather September
Move between months or click on a day
Temperatures trend during September in Bonner County
See the weather trend as well as the moving average line
September weather in Bonner County day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Partly cloudy | 32° /13° | 0 mm | 8 | |
| Sept. 2 | Partly cloudy | 31° /14° | 0 mm | 8 | |
| Sept. 3 |  Cloudy | 26° /13° | 0 mm | 6 | |
| Sept. 4 |  Sunny | 28° /12° | 0 mm | 7 | |
| Sept. 5 | Sunny | 30° /11° | 0 mm | 8 | |
| Sept. 6 | Sunny | 32° /13° | 0 mm | 8 | |
| Sept. 7 | Partly cloudy | 32° /13° | 0 mm | 8 | |
| Sept. 8 | Partly cloudy | 32° /13° | 0 mm | 8 | |
| Sept. 9 | Sunny | 28° /13° | 0 mm | 7 | |
| Sept. 10 | Sunny | 26° /13° | 0 mm | 7 | |
| Sept. 11 |  Heavy rain at times | 16° /11° | 1.3 mm | 4 | |
| Sept. 12 |  Moderate or heavy rain shower | 15° /10° | 18.9 mm | 4 | |
| Sept. 13 |  Patchy rain possible | 20° /9° | 0.4 mm | 5 | |
| Sept. 14 | Moderate rain at times | 19° /8° | 1.5 mm | 4 | |
| Sept. 15 | Patchy rain possible | 21° /7° | 0.2 mm | 5 | |
| Sept. 16 | Sunny | 24° /9° | 0 mm | 6 | |
| Sept. 17 | Patchy rain possible | 17° /11° | 0.2 mm | 4 | |
| Sept. 18 |  Overcast | 21° /11° | 0 mm | 5 | |
| Sept. 19 | Overcast | 21° /8° | 0 mm | 5 | |
| Sept. 20 | Sunny | 19° /9° | 0 mm | 5 | |
| Sept. 21 | Overcast | 19° /6° | 0 mm | 4 | |
| Sept. 22 | Overcast | 19° /8° | 0 mm | 4 | |
| Sept. 23 | Sunny | 22° /10° | 0 mm | 6 | |
| Sept. 24 | Sunny | 26° /12° | 0 mm | 7 | |
| Sept. 25 | Patchy rain possible | 27° /13° | 3.9 mm | 6 | |
| Sept. 26 | Partly cloudy | 17° /9° | 1.9 mm | 5 | |
| Sept. 27 | Overcast | 19° /9° | 0 mm | 4 | |
| Sept. 28 | Cloudy | 24° /9° | 0 mm | 5 | |
| Sept. 29 | Patchy rain possible | 16° /8° | 0.2 mm | 4 | |
| Sept. 30 | Sunny | 15° /4° | 0 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Bonner 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 Bonner County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Bonner County in September - FAQ
What are the expected maximum and minimum temperatures in Bonner County during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Bonner County during September?
In September, Bonner County can expect light to moderate rainfall, totaling 28.5 mm across approximately 6 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Bonner County during September?
The average wind speed in Bonner County during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Bonner County
Explore the daily rainfall trends and prepare for Bonner Countys September weather 💧
UV exposure in Bonner County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Bonner County
Select a location for an accurate weather forecast
More Locations Quick links
More Bonner County weather pages
You are here
Where is Bonner County?Get accurate weather forecasts for Bonner County, located at latitude 48.277 and longitude -116.553. Stay updated with localized weather information tailored for Bonner County.
Found a mistake?
We appreciate your attention to details. Tell us here.