October is one of the warmer months of the year in Idaho Falls, with average highs near 13.7°C and lows around 0.9°C (mean 7.3°C). It is about average for rainfall, averaging 40 mm of rainfall and 57% relative humidity across the period.
October is one of the warmer months of the year in Idaho Falls. Across 45 years of records, the warmest October in Idaho Falls was 1988 — when the month averaged 11.9°C — while the coldest was 2019 at 2.4°C. Typical October days reach 13.7°C with nights near 0.9°C. The long-term trend is warming, about 0.3°C per decade.
October is about average for rainfall in Idaho Falls, averaging 40 mm of rainfall. The wettest October on record was 2016 with 137 mm, while the driest was 1988 at 1 mm.
Relative humidity in Idaho Falls during October averages 57%. The most humid October was 2016 at 70%, and the least humid was 1987 at 41%.
October receives about 3.3 kWh/m²/day of solar energy in Idaho Falls. The sunniest October was 1999 at 4 kWh/m²/day, and the cloudiest was 2016 at 2.7.
Average wind speed in Idaho Falls during October is 2.4 m/s. The windiest October was 1990 at 3 m/s, while the calmest was 1987 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.1°C | 7.1°C | 7.1°C | 7.3°C | 8.6°C | +1.5°C |
| Avg High | 13.7°C | 13.6°C | 13.5°C | 13.5°C | 14.9°C | +1.2°C |
| Avg Low | 0.5°C | 0.5°C | 0.7°C | 1.2°C | 2.3°C | +1.8°C |
| Avg Rain | 30 mm | 32 mm | 45 mm | 47 mm | 50 mm | +20 mm |
October temperatures in Idaho Falls have risen by about 3.3°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -15.2°C (1991) to a record high of 28.3°C (2010).
Rainfall in October is about average for rainfall, averaging 40 mm, with a wettest year of 137 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
A good time to visit Idaho Falls
October is a good time to visit Idaho Falls, with days averaging 13.7°C and nights around 0.9°C (mean 7.3°C, close to Idaho Falls's yearly average) and moderate rainfall. July and August are marginally more temperate, but October still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 13.7°C | 7.5°C | 1.4°C | 24.6°C | -7.1°C | 79 mm | 62% | 2.3 m/s | 3.1 |
| 2024 | 18.1°C | 11.2°C | 4.3°C | 26.3°C | -3.9°C | 19 mm | 50% | 2.3 m/s | 3.6 |
| 2023 | 13.9°C | 8.2°C | 2.5°C | 23.1°C | -8.8°C | 66 mm | 65% | 2 m/s | 3.3 |
| 2022 | 15.7°C | 9.2°C | 2.6°C | 22.8°C | -5.7°C | 32 mm | 52% | 2 m/s | 3.7 |
| 2021 | 13.8°C | 7.8°C | 1.8°C | 24.3°C | -6.0°C | 76 mm | 65% | 2.5 m/s | 2.9 |
| 2020 | 14.4°C | 7.9°C | 1.4°C | 24.0°C | -9.5°C | 28 mm | 51% | 2.8 m/s | 3.5 |
| 2019 ❄️ | 8.5°C | 2.4°C | -3.6°C | 19.8°C | -14.8°C | 26 mm | 58% | 2.7 m/s | 3.2 |
| 2018 | 13.3°C | 7.3°C | 1.4°C | 23.7°C | -6.0°C | 41 mm | 63% | 2.3 m/s | 3.2 |
| 2017 | 11.4°C | 5.1°C | -1.3°C | 19.4°C | -5.1°C | 24 mm | 61% | 2.5 m/s | 3.6 |
| 2016 🌧️ | 13.5°C | 8.1°C | 2.8°C | 20.4°C | -3.3°C | 137 mm | 70% | 2.9 m/s | 2.7 |
| 2015 | 16.7°C | 10.7°C | 4.6°C | 25.2°C | -2.6°C | 47 mm | 64% | 2.2 m/s | 3.3 |
| 2014 | 16.3°C | 9.4°C | 2.5°C | 21.8°C | -3.7°C | 12 mm | 57% | 2.5 m/s | 3.7 |
| 2013 | 12.2°C | 5.8°C | -0.6°C | 19.8°C | -4.9°C | 36 mm | 58% | 2.1 m/s | 3.3 |
| 2012 | 13.4°C | 6.9°C | 0.5°C | 24.4°C | -9.3°C | 44 mm | 55% | 2.4 m/s | 3.3 |
| 2011 | 14.0°C | 8.0°C | 2.1°C | 27.1°C | -5.4°C | 61 mm | 64% | 2.5 m/s | 3.1 |
| 2010 | 15.8°C | 9.5°C | 3.2°C | 28.3°C | -5.9°C | 43 mm | 57% | 2.1 m/s | 3.1 |
| 2009 | 9.6°C | 3.9°C | -1.9°C | 19.0°C | -7.5°C | 40 mm | 65% | 2.4 m/s | 2.9 |
| 2008 | 13.9°C | 7.4°C | 0.8°C | 26.4°C | -7.9°C | 29 mm | 56% | 2.2 m/s | 3.3 |
| 2007 | 12.8°C | 6.4°C | -0.1°C | 22.3°C | -6.5°C | 74 mm | 66% | 2.3 m/s | 3 |
| 2006 | 11.5°C | 5.8°C | 0.0°C | 19.3°C | -6.0°C | 59 mm | 64% | 2.2 m/s | 3.1 |
| 2005 | 14.6°C | 8.2°C | 1.7°C | 23.7°C | -4.4°C | 46 mm | 62% | 2.2 m/s | 3.3 |
| 2004 | 13.6°C | 7.9°C | 2.3°C | 23.6°C | -6.9°C | 74 mm | 63% | 2.5 m/s | 2.9 |
| 2003 | 17.7°C | 10.6°C | 3.4°C | 27.6°C | -6.2°C | 12 mm | 41% | 2.3 m/s | 3.5 |
| 2002 | 12.1°C | 5.7°C | -0.8°C | 20.3°C | -11.2°C | 26 mm | 52% | 2 m/s | 3.4 |
| 2001 | 15.1°C | 8.1°C | 1.1°C | 25.4°C | -5.7°C | 31 mm | 45% | 2.8 m/s | 3.4 |
| 2000 | 13.8°C | 7.2°C | 0.6°C | 22.8°C | -4.4°C | 59 mm | 60% | 2.2 m/s | 3.3 |
| 1999 | 16.5°C | 8.9°C | 1.3°C | 23.6°C | -4.7°C | 12 mm | 43% | 2.4 m/s | 4 |
| 1998 | 13.5°C | 6.9°C | 0.3°C | 20.0°C | -3.9°C | 25 mm | 60% | 2.1 m/s | 3.5 |
| 1997 | 12.5°C | 6.2°C | -0.1°C | 25.6°C | -7.8°C | 39 mm | 62% | 2.7 m/s | 3.2 |
| 1996 | 12.9°C | 6.8°C | 0.7°C | 25.8°C | -9.3°C | 29 mm | 55% | 2.4 m/s | 3.5 |
| 1995 | 12.6°C | 5.8°C | -1.1°C | 21.5°C | -5.4°C | 24 mm | 54% | 2.7 m/s | 3.5 |
| 1994 | 12.6°C | 6.5°C | 0.4°C | 20.6°C | -4.3°C | 65 mm | 61% | 2.6 m/s | 3.2 |
| 1993 | 13.0°C | 6.9°C | 0.8°C | 24.7°C | -7.1°C | 36 mm | 61% | 1.9 m/s | 3.4 |
| 1992 | 15.8°C | 9.4°C | 2.9°C | 28.1°C | -4.4°C | 32 mm | 51% | 2.3 m/s | 3.1 |
| 1991 | 13.4°C | 6.7°C | 0.1°C | 23.5°C | -15.2°C | 32 mm | 50% | 2.5 m/s | 3.4 |
| 1990 | 13.3°C | 6.5°C | -0.2°C | 24.7°C | -5.9°C | 27 mm | 51% | 3 m/s | 3.2 |
| 1989 | 13.4°C | 7.2°C | 1.1°C | 21.3°C | -8.6°C | 35 mm | 56% | 2.5 m/s | 3.2 |
| 1988 🔥 | 19.2°C | 11.9°C | 4.6°C | 25.0°C | -2.5°C | 1 mm | 41% | 2.1 m/s | 3.7 |
| 1987 | 17.1°C | 9.6°C | 2.1°C | 25.3°C | -4.4°C | 6 mm | 41% | 1.7 m/s | 3.8 |
| 1986 | 14.8°C | 7.5°C | 0.2°C | 19.0°C | -5.5°C | 17 mm | 58% | 1.9 m/s | 3.7 |
| 1985 | 12.5°C | 5.7°C | -1.0°C | 18.2°C | -7.3°C | 30 mm | 57% | 2.7 m/s | 3.4 |
| 1984 | 9.5°C | 3.7°C | -2.1°C | 21.4°C | -7.7°C | 35 mm | 64% | 2.5 m/s | 3 |
| 1983 | 14.2°C | 7.8°C | 1.3°C | 20.3°C | -3.8°C | 47 mm | 64% | 2 m/s | — |
| 1982 | 10.3°C | 4.7°C | -0.9°C | 19.0°C | -5.1°C | 47 mm | 69% | 2.2 m/s | — |
| 1981 | 12.1°C | 5.8°C | -0.4°C | 21.9°C | -5.3°C | 49 mm | 59% | 2.4 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 13.7°C with lows near 0.9°C (mean 7.3°C), based on 45 years of NASA POWER data.
October averages 40 mm of rainfall in Idaho Falls, about average for rainfall. The wettest on record was 137 mm in 2016.
The hottest October reached 28.3°C in 2010. The coldest dipped to -15.2°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 3.3°C. Daytime highs moved from 11.7°C to 15°C and overnight lows from -0.6°C to 2.5°C over the same span.
October is one of the warmer months of the year in Idaho Falls and about average for rainfall, so plan for around 13.7°C daytime highs and 0.9°C at night.
Not quite — October is the 7th coolest month in Idaho Falls, averaging 7.3°C.
For October in Idaho Falls, pack warm layers and a jacket for chilly mornings, with typical highs of 13.7°C and lows of 0.9°C.
Relative humidity in October averages 57% — moderately humid.
Average wind speed in October is 2.4 m/s. The windiest October on record averaged 3 m/s (1990).
The wettest October on record was 2016 with 137 mm. On average, October sees 40 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Idaho Falls behaves each October, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for October specifically, along with year-by-year records and how the month has changed over the decades.
