Bonneville County (Idaho Falls)
September
Weather in Bonneville County, Idaho for September 2027
Your guide to Bonneville County weather in September - trends and predictions
In general, the average temperature in Bonneville County at the beginning of September is 29.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.8 °C by the end of September.
With an average of 3 rainy days, Bonneville County experiences minimal rainfall in September.
Is September a good time to visit Bonneville County? check out the best time to travel to Bonneville County page.
✨ Is September a good time to visit Bonneville County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
27
Dry days
3
Rainy days
0
Snow days
25°/8°
Temperatures
21 km/h
Avg max wind
43 %
Avg humidity
Bonneville County Weather September
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Temperatures trend during September in Bonneville County
See the weather trend as well as the moving average line
September weather in Bonneville County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Light rain | 31° /11° | 6.5 mm | 6 | |
| Sept. 2 |  Cloudy | 30° /11° | 0 mm | 6 | |
| Sept. 3 |  Patchy rain possible | 28° /11° | 0.2 mm | 6 | |
| Sept. 4 |  Sunny | 28° /10° | 0 mm | 7.3 | |
| Sept. 5 | Sunny | 29° /10° | 0 mm | 7.2 | |
| Sept. 6 | Sunny | 30° /9° | 0.1 mm | 7.1 | |
| Sept. 7 |  Partly cloudy | 28° /11° | 0 mm | 7 | |
| Sept. 8 | Sunny | 28° /8° | 0 mm | 6.9 | |
| Sept. 9 | Sunny | 28° /10° | 0 mm | 6.8 | |
| Sept. 10 |  Overcast | 29° /10° | 0 mm | 6.7 | |
| Sept. 11 | Patchy rain possible | 27° /13° | 0.2 mm | 6 | |
| Sept. 12 | Patchy rain possible | 22° /7° | 1.1 mm | 5 | |
| Sept. 13 | Sunny | 22° /9° | 0 mm | 6 | |
| Sept. 14 | Overcast | 23° /6° | 0.1 mm | 6 | |
| Sept. 15 | Cloudy | 23° /7° | 0 mm | 5 | |
| Sept. 16 | Patchy rain possible | 25° /8° | 0.5 mm | 6 | |
| Sept. 17 |  Heavy rain at times | 21° /8° | 6 mm | 4 | |
| Sept. 18 | Light rain | 21° /7° | 4.3 mm | 4 | |
| Sept. 19 | Sunny | 22° /6° | 0.5 mm | 5 | |
| Sept. 20 | Sunny | 23° /6° | 0 mm | 5.8 | |
| Sept. 21 | Patchy rain possible | 22° /7° | 2.2 mm | 5.7 | |
| Sept. 22 | Light rain | 20° /7° | 4.8 mm | 4 | |
| Sept. 23 | Sunny | 22° /6° | 0.1 mm | 5.5 | |
| Sept. 24 | Sunny | 24° /6° | 0 mm | 5.4 | |
| Sept. 25 | Sunny | 27° /7° | 0 mm | 5.3 | |
| Sept. 26 | Cloudy | 24° /10° | 0 mm | 5.2 | |
| Sept. 27 | Sunny | 25° /7° | 0 mm | 5 | |
| Sept. 28 | Sunny | 22° /7° | 0.1 mm | 5 | |
| Sept. 29 | Sunny | 25° /8° | 0 mm | 5 | |
| Sept. 30 | Sunny | 19° /8° | 0 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Bonneville 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 Bonneville County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Bonneville County in September - FAQ
What are the expected maximum and minimum temperatures in Bonneville County during September?
Enjoy moderate daytime temperatures of up to 25° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Bonneville County during September?
In September, Bonneville County can expect light to moderate rainfall, totaling 26.6 mm across approximately 3 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Bonneville County during September?
The average wind speed in Bonneville County during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Bonneville County
Explore the daily rainfall trends and prepare for Bonneville Countys September weather 💧
Typically, Bonneville County has 3 rainy days in September with a total of 26.6 mm of rainfall.
UV exposure in Bonneville County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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