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United States weather

Weather in Idaho Falls, Idaho for September 2026

Your guide to Idaho Falls weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Idaho Falls is slightly cooler than the historical average by 1.1 °F.

  • The forecast for the upcoming days in Idaho Falls predicts a temperature of 23.6 °F, which is slightly above the historical average.

  • In general, the average temperature in Idaho Falls at the beginning of September is 29.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 22.1 °F by the end of September.

    • Rain 🌧️

  • With an average of 5 rainy days, Idaho Falls experiences minimal rainfall in September.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
25
Dry days
Average rainy days
5
Rainy days
Average snowy days
0
Snow days
Average temperatures
25°/8°
Temperatures
Average wind speed
21 km/h
Avg max wind
Average humidity
44 %
Avg humidity

Idaho Falls Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
32°
2
Cloudy
30°
3
Moderate rain at times
28°
4
Sunny
28°
5
Sunny
29°
6
Sunny
30°
7
Partly cloudy
28°
8
Sunny
29°
9
Sunny
29°
10
Overcast
29°
11
Patchy rain possible
27°
12
Patchy rain possible
22°
13
Sunny
23°
14
Overcast
23°
15
Cloudy
23°
16
Heavy rain at times
25°
17
Heavy rain at times
22°
18
Moderate rain at times
21°
19
Sunny
22°
20
Sunny
23°
21
Sunny
22°
22
Sunny
20°
23
Sunny
24°
24
Sunny
27°
25
Sunny
26°
26
Sunny
24°
27
Overcast
25°
28
Patchy rain possible
13°
29
Sunny
17°
30
Sunny
23°

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
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 32° /11° 6.5 mm 6
Sept. 2 Cloudy
Cloudy
 30° /11° 0 mm 6
Sept. 3 Moderate rain at times
Moderate rain at times
 28° /11° 0.2 mm 6
Sept. 4 Sunny
Sunny
 28° /10° 0 mm 8
Sept. 5 Sunny
Sunny
 29° /9° 0 mm 8
Sept. 6 Sunny
Sunny
 30° /9° 0.1 mm 8
Sept. 7 Partly cloudy
Partly cloudy
 28° /10° 0 mm 8
Sept. 8 Sunny
Sunny
 29° /7° 0 mm 7
Sept. 9 Sunny
Sunny
 29° /9° 0 mm 7
Sept. 10 Overcast
Overcast
 29° /10° 0 mm 7
Sept. 11 Patchy rain possible
Patchy rain possible
 27° /13° 0.2 mm 6
Sept. 12 Patchy rain possible
Patchy rain possible
 22° /7° 1.1 mm 5
Sept. 13 Sunny
Sunny
 23° /9° 0 mm 6
Sept. 14 Overcast
Overcast
 23° /6° 0.1 mm 6
Sept. 15 Cloudy
Cloudy
 23° /7° 0 mm 5
Sept. 16 Heavy rain at times
Heavy rain at times
 25° /7° 0.5 mm 6
Sept. 17 Heavy rain at times
Heavy rain at times
 22° /7° 6 mm 4
Sept. 18 Moderate rain at times
Moderate rain at times
 21° /7° 4.3 mm 4
Sept. 19 Sunny
Sunny
 22° /6° 0.5 mm 5
Sept. 20 Sunny
Sunny
 23° /6° 0 mm 6
Sept. 21 Sunny
Sunny
 22° /6° 2.2 mm 6
Sept. 22 Sunny
Sunny
 20° /7° 4.8 mm 4
Sept. 23 Sunny
Sunny
 24° /9° 0 mm 5.6
Sept. 24 Sunny
Sunny
 27° /12° 0 mm 5.7
Sept. 25 Sunny
Sunny
 26° /12° 0 mm 5.3
Sept. 26 Sunny
Sunny
 24° /11° 0 mm 5
Sept. 27 Overcast
Overcast
 25° /10° 0.1 mm 6
Sept. 28 Patchy rain possible
Patchy rain possible
 13° /7° 7.3 mm 3
Sept. 29 Sunny
Sunny
 17° /5° 0 mm 5
Sept. 30 Sunny
Sunny
 23° /7° 0 mm 6
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.
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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 22.1 mm across approximately 5 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 5 rainy days in September with a total of 22.1 mm of rainfall.

UV exposure in Idaho Falls during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates 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.

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