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Twin Falls (ID)
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Twin Falls (ID)
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United States weather

Weather in Twin Falls, Idaho for September 2026

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

    Temperatures

  • Until now, September 2026 in Twin Falls is slightly cooler than the historical average by 1.9 °F.

  • The forecast for the upcoming days in Twin Falls predicts a temperature of 26.3 °F, which is slightly above the historical average.

  • In general, the average temperature in Twin Falls at the beginning of September is 30 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 24.9 °F by the end of September.

    • Rain 🌧️

  • With an average of 3 rainy days, Twin Falls experiences minimal rainfall in September.

    • More

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Average dry days
27
Dry days
Average rainy days
3
Rainy days
Average snowy days
0
Snow days
Average temperatures
28°/11°
Temperatures
Average wind speed
22 km/h
Avg max wind
Average humidity
44 %
Avg humidity

Twin Falls Weather September

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

Temperatures trend during September in Twin Falls

See the weather trend as well as the moving average line

September weather in Twin Falls day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 33° /12° 4.5 mm 6
Sept. 2 Overcast
Overcast
 31° /14° 0 mm 6
Sept. 3 Overcast
Overcast
 31° /14° 0 mm 8
Sept. 4 Sunny
Sunny
 29° /11° 0 mm 8
Sept. 5 Sunny
Sunny
 30° /11° 0 mm 8
Sept. 6 Overcast
Overcast
 28° /12° 0 mm 8
Sept. 7 Cloudy
Cloudy
 28° /10° 0 mm 8
Sept. 8 Partly cloudy
Partly cloudy
 29° /8° 0 mm 7
Sept. 9 Overcast
Overcast
 27° /12° 0 mm 6
Sept. 10 Overcast
Overcast
 29° /12° 0 mm 5
Sept. 11 Cloudy
Cloudy
 26° /14° 0.1 mm 7
Sept. 12 Thundery outbreaks possible
Thundery outbreaks possible
 27° /8° 0 mm 6
Sept. 13 Sunny
Sunny
 24° /10° 0 mm 7
Sept. 14 Thundery outbreaks possible
Thundery outbreaks possible
 24° /8° 0 mm 7
Sept. 15 Partly cloudy
Partly cloudy
 25° /7° 0 mm 6
Sept. 16 Sunny
Sunny
 28° /7° 0 mm 6
Sept. 17 Sunny
Sunny
 29° /13° 0.2 mm 5
Sept. 18 Sunny
Sunny
 25° /10° 0.4 mm 6
Sept. 19 Overcast
Overcast
 25° /10° 0.9 mm 4
Sept. 20 Overcast
Overcast
 27° /12° 1.9 mm 6
Sept. 21 Light rain shower
Light rain shower
 28° /12° 2 mm 5
Sept. 22 Sunny
Sunny
 23° /11° 2.2 mm 3
Sept. 23 Sunny
Sunny
 29° /11° 0 mm 5.8
Sept. 24 Sunny
Sunny
 31° /14° 0 mm 5.9
Sept. 25 Overcast
Overcast
 30° /15° 0 mm 5.2
Sept. 26 Overcast
Overcast
 23° /10° 0 mm 4.9
Sept. 27 Overcast
Overcast
 25° /9° 0 mm 6
Sept. 28 Sunny
Sunny
 16° /9° 0.3 mm 5
Sept. 29 Sunny
Sunny
 20° /8° 0 mm 6
Sept. 30 Sunny
Sunny
 29° /9° 0 mm 7
Next
Important Notice
Our weather forecast for Twin 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 Twin Falls forecast closer to your planned date for the most up-to-date weather information.
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Twin Falls in September - FAQ

What are the expected maximum and minimum temperatures in Twin Falls during September?
Enjoy moderate daytime temperatures of up to 28° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Twin Falls during September?
In September, Twin Falls can expect light to moderate rainfall, totaling 39.9 mm across approximately 3 days. Occasional showers are possible, and planning ahead for them could be helpful.

What are the typical wind conditions in Twin Falls during September?
The average wind speed in Twin Falls during September is 22 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Twin Falls

Explore the daily rainfall trends and prepare for Twin Fallss September weather 💧
Typically, Twin Falls has 3 rainy days in September with a total of 39.9 mm of rainfall.

UV exposure in Twin 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 Twin Falls?

Get accurate weather forecasts for Twin Falls, located at latitude 42.563 and longitude -114.461. Stay updated with localized weather information tailored for Twin Falls.

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