Idaho Falls (ID)
September
Weather in Idaho Falls, Idaho for September 2027
Your guide to Idaho Falls weather in September - trends and predictions
In general, the average temperature in Idaho Falls 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, Idaho Falls experiences minimal rainfall in September.
Is September a good time to visit Idaho Falls? check out the best time to travel to Idaho Falls page.
✨ Is September a good time to visit Idaho Falls? – 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
Idaho Falls Weather September
Move between months or click on a day
Temperatures trend during September in Idaho Falls
See the weather trend as well as the moving average line
September weather in Idaho Falls day by day
Click on a date for more information
| 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 Idaho Falls 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 Falls forecast closer to your planned date for the most up-to-date weather information.
Change Month
Idaho Falls in September - FAQ
What are the expected maximum and minimum temperatures in Idaho Falls 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 Idaho Falls during September?
In September, Idaho Falls 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 Idaho Falls during September?
The average wind speed in Idaho Falls during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Idaho Falls
Explore the daily rainfall trends and prepare for Idaho Fallss September weather 💧
Typically, Idaho Falls has 3 rainy days in September with a total of 26.6 mm of rainfall.
UV exposure in Idaho Falls during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Quick links
More Idaho Falls weather pages
You are here
Where is Idaho Falls?Get accurate weather forecasts for Idaho Falls, located at latitude 43.467 and longitude -112.034. Stay updated with localized weather information tailored for Idaho Falls.
Found a mistake?
We appreciate your attention to details. Tell us here.