Idaho Falls
FallPeak season ~78°F highs
Things to do in Idaho Falls in September
September is one of the best months to visit Idaho Falls, with average highs around 78°F. Crisp air and changing leaves make parks and viewpoints shine.
Best picks for September
What's famous here, weighted toward what shines in September.
Holidays in September 2027
- Labour Day · Mon, Sep 6
Expect busier roads and pricier stays around these dates. See long weekends.
Also great in September in Idaho
Idaho Falls in September: quick answers
Is September a good time to visit Idaho Falls?
September is one of the best months to visit Idaho Falls, with average highs around 78°F. Crisp air and changing leaves make parks and viewpoints shine.
What is the weather like in Idaho Falls in September?
Average daytime highs are around 78°F, compared with 90°F in the warmest month. Check the forecast a week out; our planner favors indoor stops on rainy days.
What are the best things to do in Idaho Falls in September?
Top picks for September: Yellowstone National Park, Experimental Breeder Reactor I, Targhee National Forest, Bottolfsen Park, Eighteenmile Wilderness Study Area.
