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Bonner County (Sandpoint)
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United States weather

Weather in Bonner County, Idaho for September 2026

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

    Temperatures

  • Until now, September 2026 in Bonner County has been significantly cooler than historical averages by 5.1 °F, with average temperature of 18.2 °F.

  • The forecast for the upcoming days in Bonner County predicts a temperature of 16.5 °F, which is slightly above the historical average.

  • In general, the average temperature in Bonner County at the beginning of September is 26.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.3 °F by the end of September.

    • Rain 🌧️

  • Bonner County experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 28.3 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
24°/12°
Temperatures
Average wind speed
10 km/h
Avg max wind
Average humidity
50 %
Avg humidity

Bonner County Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Partly cloudy
31°
2
Partly cloudy
28°
3
Cloudy
25°
4
Sunny
24°
5
Sunny
25°
6
Sunny
28°
7
Partly cloudy
24°
8
Partly cloudy
26°
9
Sunny
25°
10
Sunny
25°
11
Heavy rain at times
18°
12
Overcast
19°
13
Patchy rain possible
20°
14
Moderate rain at times
16°
15
Patchy rain possible
18°
16
Sunny
23°
17
Patchy rain possible
22°
18
Overcast
24°
19
Overcast
24°
20
Sunny
23°
21
Overcast
21°
22
Overcast
20°
23
Overcast
20°
24
Overcast
22°
25
Overcast
16°
26
Patchy rain possible
14°
27
Overcast
13°
28
Sunny
13°
29
Overcast
13°
30
Overcast
16°

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
August October
Date Weather Temperatures Rain UV More
Sept. 1 Partly cloudy
Partly cloudy
 31° /15° 0.2 mm 6
Sept. 2 Partly cloudy
Partly cloudy
 28° /14° 39.4 mm 6
Sept. 3 Cloudy
Cloudy
 25° /13° 12.9 mm 5
Sept. 4 Sunny
Sunny
 24° /12° 14.4 mm 5
Sept. 5 Sunny
Sunny
 25° /10° 0 mm 7
Sept. 6 Sunny
Sunny
 28° /12° 0.6 mm 6
Sept. 7 Partly cloudy
Partly cloudy
 24° /13° 5.2 mm 5
Sept. 8 Partly cloudy
Partly cloudy
 26° /12° 21.8 mm 5
Sept. 9 Sunny
Sunny
 25° /12° 0 mm 6
Sept. 10 Sunny
Sunny
 25° /13° 1.4 mm 5
Sept. 11 Heavy rain at times
Heavy rain at times
 18° /12° 5.1 mm 3
Sept. 12 Overcast
Overcast
 19° /11° 6.3 mm 3
Sept. 13 Patchy rain possible
Patchy rain possible
 20° /10° 4.3 mm 4
Sept. 14 Moderate rain at times
Moderate rain at times
 16° /8° 2.4 mm 3
Sept. 15 Patchy rain possible
Patchy rain possible
 18° /9° 0.1 mm 3
Sept. 16 Sunny
Sunny
 23° /9° 0 mm 6
Sept. 17 Patchy rain possible
Patchy rain possible
 22° /11° 0.1 mm 5
Sept. 18 Overcast
Overcast
 24° /11° 0 mm 5
Sept. 19 Overcast
Overcast
 24° /10° 0 mm 5
Sept. 20 Sunny
Sunny
 23° /11° 0 mm 5
Sept. 21 Overcast
Overcast
 21° /10° 0 mm 4
Sept. 22 Overcast
Overcast
 20° /9° 0 mm 3
Sept. 23 Overcast
Overcast
 20° /8° 0 mm 3.7
Sept. 24 Overcast
Overcast
 22° /8° 0 mm 4
Sept. 25 Overcast
Overcast
 16° /6° 4.7 mm 3.3
Sept. 26 Patchy rain possible
Patchy rain possible
 14° /2° 0.9 mm 3.7
Sept. 27 Overcast
Overcast
 13° /4° 0 mm 3
Sept. 28 Sunny
Sunny
 13° /3° 0 mm 4
Sept. 29 Overcast
Overcast
 13° /3° 0 mm 4
Sept. 30 Overcast
Overcast
 16° /6° 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.
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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 24° and cooler nights around 12°. 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 28.3 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 10 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 💧
Typically, Bonner County has 6 rainy days in September with a total of 28.3 mm of rainfall.

UV exposure in Bonner County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Sandpoint
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Location coordinates 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.

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