Twin Falls (ID)
September
Weather in Twin Falls, Idaho for September 2026
Your guide to Twin Falls weather in September - trends and predictions
In general, the average temperature in Twin Falls at the beginning of September is 33.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 27.1 °F by the end of September.
With an average of 3 rainy days, Twin Falls experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
27
Dry days
3
Rainy days
0
Snow days
28°/11°
Temperatures
22 km/h
Avg max wind
45 %
Avg humidity
Twin Falls Weather September
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Temperatures trend during September in Twin Falls
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September weather in Twin Falls day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 35° /10° | 0 mm | 8 | |
| Sept. 2 |  Overcast | 36° /15° | 0 mm | 8 | |
| Sept. 3 | Overcast | 36° /17° | 0 mm | 8 | |
| Sept. 4 | Sunny | 34° /16° | 0 mm | 8 | |
| Sept. 5 | Sunny | 32° /14° | 0 mm | 8 | |
| Sept. 6 | Overcast | 28° /13° | 0 mm | 7 | |
| Sept. 7 |  Cloudy | 33° /13° | 0 mm | 8 | |
| Sept. 8 |  Partly cloudy | 31° /11° | 0 mm | 7 | |
| Sept. 9 | Overcast | 25° /14° | 0 mm | 4 | |
| Sept. 10 | Overcast | 29° /14° | 0 mm | 5 | |
| Sept. 11 | Cloudy | 23° /11° | 0 mm | 7 | |
| Sept. 12 |  Thundery outbreaks possible | 24° /7° | 0 mm | 7 | |
| Sept. 13 | Sunny | 27° /9° | 0 mm | 7 | |
| Sept. 14 | Thundery outbreaks possible | 28° /8° | 0 mm | 7 | |
| Sept. 15 | Partly cloudy | 23° /9° | 0 mm | 6 | |
| Sept. 16 | Sunny | 26° /6° | 0 mm | 6 | |
| Sept. 17 | Sunny | 27° /10° | 0 mm | 6 | |
| Sept. 18 | Sunny | 29° /8° | 0 mm | 6 | |
| Sept. 19 | Overcast | 29° /10° | 0 mm | 2 | |
| Sept. 20 | Overcast | 29° /14° | 3.8 mm | 6 | |
| Sept. 21 |  Light rain shower | 28° /15° | 4.1 mm | 4 | |
| Sept. 22 | Sunny | 21° /10° | 0 mm | 5 | |
| Sept. 23 | Sunny | 27° /4° | 0 mm | 5 | |
| Sept. 24 | Sunny | 29° /6° | 0 mm | 5 | |
| Sept. 25 | Sunny | 31° /7° | 0 mm | 5 | |
| Sept. 26 | Sunny | 25° /11° | 0 mm | 5 | |
| Sept. 27 | Sunny | 27° /5° | 0 mm | 5 | |
| Sept. 28 | Sunny | 29° /9° | 0 mm | 5 | |
| Sept. 29 | Overcast | 27° /13° | 0 mm | 5 | |
| Sept. 30 |  Moderate rain | 22° /11° | 32 mm | 3 | |
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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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