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Bonneville County (Idaho Falls)
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United States weather

Weather in Bonneville County, Idaho for September 2025

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

    Official Weather Alert ⚠️

  • Lake Wind Advisory - See hour by hour.

    • Temperatures

  • Until now, September 2025 in Bonneville County has been nearly identical to the historical average, with a temperature of 28 °F (showing only a slight deviation of -0.4 °F).

  • Expect cooler weather in the next days in Bonneville County with the forecast suggesting a temperature of 25.4 °F, lower than the historical average.

  • In general, the average temperature in Bonneville County at the beginning of September is 30.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.9 °F by the end of September.

    • Rain 🌧️

  • With an average of 4 rainy days, Bonneville County experiences minimal rainfall in September.

    • More

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

Average dry days
26
Dry days
Average rainy days
4
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/9°
Temperatures
Average wind speed
21 km/h
Avg max wind
Average humidity
39 %
Avg humidity

Bonneville County Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
33°
2
Cloudy
33°
3
Moderate rain at times
30°
4
Sunny
29°
5
Sunny
29°
6
Sunny
29°
7
Partly cloudy
31°
8
Sunny
30°
9
Sunny
30°
10
Overcast
29°
11
Patchy rain possible
27°
12
Patchy rain possible
20°
13
Sunny
22°
14
Overcast
25°
15
Cloudy
23°
16
Weather Alert Sunny
25°
17
Sunny
26°
18
Sunny
26°
19
Overcast
28°
20
Patchy rain possible
24°
21
Sunny
24°
22
Sunny
25°
23
Sunny
29°
24
Sunny
28°
25
Sunny
28°
26
Sunny
32°
27
Partly cloudy
23°
28
Sunny
18°
29
Sunny
20°
30
Sunny
18°

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

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 33° /10° 0 mm 8
Sept. 2 Cloudy
Cloudy
 33° /11° 0 mm 8
Sept. 3 Moderate rain at times
Moderate rain at times
 30° /11° 0.3 mm 7
Sept. 4 Sunny
Sunny
 29° /11° 0 mm 8
Sept. 5 Sunny
Sunny
 29° /10° 0 mm 8
Sept. 6 Sunny
Sunny
 29° /9° 0 mm 8
Sept. 7 Partly cloudy
Partly cloudy
 31° /11° 0 mm 8
Sept. 8 Sunny
Sunny
 30° /9° 0 mm 7
Sept. 9 Sunny
Sunny
 30° /11° 0 mm 7
Sept. 10 Overcast
Overcast
 29° /12° 0 mm 7
Sept. 11 Patchy rain possible
Patchy rain possible
 27° /12° 0.2 mm 7
Sept. 12 Patchy rain possible
Patchy rain possible
 20° /7° 1.6 mm 5
Sept. 13 Sunny
Sunny
 22° /7° 0 mm 6
Sept. 14 Overcast
Overcast
 25° /6° 0 mm 6
Sept. 15 Cloudy
Cloudy
 23° /8° 0 mm 5
Sept. 16 Sunny
Sunny
 25° /4° 0 mm 1.4
Sept. 17 Sunny
Sunny
 26° /5° 0 mm 1.5
Sept. 18 Sunny
Sunny
 26° /4° 0 mm 1.6
Sept. 19 Overcast
Overcast
 28° /10° 0 mm 1.3
Sept. 20 Patchy rain possible
Patchy rain possible
 24° /12° 1 mm 0
Sept. 21 Sunny
Sunny
 24° /13° 0 mm 5
Sept. 22 Sunny
Sunny
 25° /10° 0 mm 5
Sept. 23 Sunny
Sunny
 29° /10° 0 mm 5
Sept. 24 Sunny
Sunny
 28° /17° 0 mm 6
Sept. 25 Sunny
Sunny
 28° /12° 0 mm 5
Sept. 26 Sunny
Sunny
 32° /13° 0 mm 6
Sept. 27 Partly cloudy
Partly cloudy
 23° /10° 0 mm 5
Sept. 28 Sunny
Sunny
 18° /9° 0 mm 4
Sept. 29 Sunny
Sunny
 20° /5° 0 mm 4
Sept. 30 Sunny
Sunny
 18° /5° 0 mm 5
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.
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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 26° and cooler nights around 9°. 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 24.7 mm across approximately 4 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 💧

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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Idaho Falls
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Location coordinates Where is Bonneville County?

Get accurate weather forecasts for Bonneville County, located at latitude 43.467 and longitude -112.034. Stay updated with localized weather information tailored for Bonneville County.

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