October is close to Boise's year-round average, with average highs near 17.4°C and lows around 4.9°C (mean 11.1°C). It is about average for rainfall, averaging 28 mm of rainfall and 48% relative humidity across the period.
October is close to Boise's year-round average. Across 45 years of records, the warmest October in Boise was 1988 — when the month averaged 16.2°C — while the coldest was 2019 at 7°C. Typical October days reach 17.4°C with nights near 4.9°C. The long-term trend is warming, about 0.3°C per decade.
October is about average for rainfall in Boise, averaging 28 mm of rainfall. The wettest October on record was 2021 with 72 mm, while the driest was 1988 at 0 mm.
Relative humidity in Boise during October averages 48%. The most humid October was 2009 at 59%, and the least humid was 1987 at 30%.
October receives about 3.5 kWh/m²/day of solar energy in Boise. The sunniest Octobers were 1999, 2002 and 2022, among others at 3.9 kWh/m²/day, and the cloudiest was 2016 at 2.9.
Average wind speed in Boise during October is 2 m/s. The windiest October was 2001 at 2.5 m/s, while the calmest were 1987 and 2022 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.9°C | 10.8°C | 10.8°C | 11.4°C | 12.5°C | +1.6°C |
| Avg High | 17.2°C | 17.2°C | 17.0°C | 17.4°C | 19.0°C | +1.8°C |
| Avg Low | 4.5°C | 4.5°C | 4.7°C | 5.4°C | 6.1°C | +1.6°C |
| Avg Rain | 25 mm | 22 mm | 28 mm | 30 mm | 36 mm | +10 mm |
October temperatures in Boise have risen by about 3.4°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -7.8°C (2002) to a record high of 33.5°C (2010).
Rainfall in October is about average for rainfall, averaging 28 mm, with a wettest year of 72 mm.
A good time to visit Boise
October is a good time to visit Boise, with days averaging 17.4°C and nights around 4.9°C (mean 11.1°C, close to Boise's yearly average) and low rainfall. August and July 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 | 17.2°C | 10.6°C | 4.0°C | 28.0°C | -2.4°C | 48 mm | 56% | 2.1 m/s | 3.5 |
| 2024 | 20.8°C | 13.8°C | 6.8°C | 31.1°C | -1.0°C | 13 mm | 41% | 2 m/s | 3.6 |
| 2023 | 18.6°C | 12.4°C | 6.2°C | 29.1°C | -5.6°C | 33 mm | 53% | 1.9 m/s | 3.5 |
| 2022 | 20.9°C | 14.4°C | 8.0°C | 28.1°C | -0.4°C | 29 mm | 38% | 1.6 m/s | 3.9 |
| 2021 🌧️ | 17.7°C | 11.8°C | 5.8°C | 28.9°C | -1.4°C | 72 mm | 53% | 2.3 m/s | 3.1 |
| 2020 | 18.9°C | 12.2°C | 5.5°C | 30.2°C | -5.8°C | 20 mm | 43% | 2.1 m/s | 3.7 |
| 2019 ❄️ | 13.0°C | 7.0°C | 1.0°C | 25.3°C | -7.2°C | 15 mm | 45% | 2.2 m/s | 3.6 |
| 2018 | 16.6°C | 10.9°C | 5.2°C | 24.4°C | -0.6°C | 30 mm | 53% | 1.7 m/s | 3.3 |
| 2017 | 15.3°C | 9.2°C | 3.1°C | 22.8°C | -3.2°C | 23 mm | 52% | 1.9 m/s | 3.6 |
| 2016 | 17.5°C | 12.1°C | 6.6°C | 25.9°C | 0.9°C | 55 mm | 53% | 2.2 m/s | 2.9 |
| 2015 | 21.3°C | 15.4°C | 9.5°C | 31.4°C | 4.0°C | 30 mm | 50% | 1.8 m/s | 3.4 |
| 2014 | 20.2°C | 13.9°C | 7.6°C | 27.2°C | 0.0°C | 17 mm | 46% | 2.2 m/s | 3.6 |
| 2013 | 16.1°C | 9.6°C | 3.1°C | 23.5°C | -1.0°C | 13 mm | 52% | 1.8 m/s | 3.8 |
| 2012 | 17.6°C | 11.3°C | 5.0°C | 27.2°C | -2.5°C | 29 mm | 44% | 1.8 m/s | 3.6 |
| 2011 | 17.3°C | 11.6°C | 5.9°C | 31.2°C | -2.6°C | 50 mm | 53% | 1.8 m/s | 3.3 |
| 2010 | 19.0°C | 13.0°C | 7.0°C | 33.5°C | -1.0°C | 40 mm | 47% | 2.2 m/s | 3.3 |
| 2009 | 13.2°C | 7.7°C | 2.2°C | 23.7°C | -4.4°C | 47 mm | 59% | 2.1 m/s | 3 |
| 2008 | 17.4°C | 11.1°C | 4.8°C | 30.3°C | -3.1°C | 15 mm | 48% | 2 m/s | 3.5 |
| 2007 | 15.4°C | 9.7°C | 3.9°C | 26.1°C | -0.1°C | 47 mm | 57% | 2.3 m/s | 3.2 |
| 2006 | 16.7°C | 10.4°C | 4.2°C | 26.9°C | -5.3°C | 11 mm | 47% | 2.2 m/s | 3.6 |
| 2005 | 17.7°C | 11.5°C | 5.2°C | 28.1°C | 0.4°C | 21 mm | 52% | 1.8 m/s | 3.5 |
| 2004 | 17.4°C | 11.3°C | 5.2°C | 29.4°C | -3.2°C | 46 mm | 52% | 2.1 m/s | 3.3 |
| 2003 | 21.3°C | 14.8°C | 8.3°C | 31.2°C | -3.3°C | 3 mm | 36% | 2.1 m/s | 3.7 |
| 2002 | 16.4°C | 9.8°C | 3.2°C | 23.3°C | -7.8°C | 5 mm | 43% | 1.8 m/s | 3.9 |
| 2001 | 17.8°C | 11.5°C | 5.1°C | 31.2°C | -3.0°C | 25 mm | 45% | 2.5 m/s | 3.6 |
| 2000 | 16.8°C | 10.6°C | 4.4°C | 28.8°C | -3.1°C | 62 mm | 54% | 2 m/s | 3.3 |
| 1999 | 19.8°C | 12.5°C | 5.2°C | 27.5°C | -1.0°C | 11 mm | 33% | 2.1 m/s | 3.9 |
| 1998 | 16.3°C | 10.1°C | 3.9°C | 26.0°C | -3.0°C | 6 mm | 49% | 2.3 m/s | 3.7 |
| 1997 | 16.5°C | 10.3°C | 4.1°C | 31.9°C | -2.3°C | 25 mm | 48% | 2.3 m/s | 3.6 |
| 1996 | 16.8°C | 10.9°C | 5.0°C | 30.3°C | -3.9°C | 33 mm | 48% | 1.9 m/s | 3.4 |
| 1995 | 16.0°C | 9.5°C | 3.1°C | 26.1°C | -4.1°C | 20 mm | 47% | 2.4 m/s | 3.7 |
| 1994 | 16.2°C | 9.9°C | 3.7°C | 24.8°C | -0.7°C | 25 mm | 52% | 2.1 m/s | 3.6 |
| 1993 | 17.4°C | 11.1°C | 4.9°C | 29.3°C | -2.6°C | 15 mm | 51% | 1.8 m/s | 3.5 |
| 1992 | 19.1°C | 12.8°C | 6.5°C | 33.4°C | -1.1°C | 32 mm | 43% | 1.9 m/s | 3.5 |
| 1991 | 17.6°C | 11.2°C | 4.8°C | 29.3°C | -7.6°C | 35 mm | 41% | 1.9 m/s | 3.6 |
| 1990 | 16.5°C | 10.0°C | 3.4°C | 28.9°C | -3.1°C | 20 mm | 47% | 2.4 m/s | 3.4 |
| 1989 | 16.0°C | 10.1°C | 4.2°C | 25.3°C | -5.1°C | 30 mm | 52% | 1.8 m/s | 3.5 |
| 1988 🔥 | 23.1°C | 16.2°C | 9.2°C | 30.4°C | 1.7°C | 0 mm | 34% | 1.8 m/s | 3.8 |
| 1987 | 21.3°C | 14.2°C | 7.1°C | 31.0°C | 0.5°C | 1 mm | 30% | 1.6 m/s | 3.9 |
| 1986 | 18.1°C | 11.4°C | 4.7°C | 23.7°C | 0.1°C | 9 mm | 51% | 1.8 m/s | 3.8 |
| 1985 | 14.8°C | 8.6°C | 2.3°C | 23.8°C | -5.0°C | 37 mm | 55% | 2.1 m/s | 3.3 |
| 1984 | 13.7°C | 7.8°C | 1.9°C | 28.8°C | -3.9°C | 30 mm | 56% | 2 m/s | 3.1 |
| 1983 | 17.9°C | 11.6°C | 5.2°C | 23.8°C | -0.2°C | 28 mm | 53% | 2 m/s | — |
| 1982 | 15.0°C | 9.1°C | 3.2°C | 23.6°C | -3.3°C | 56 mm | 57% | 2.2 m/s | — |
| 1981 | 14.8°C | 8.8°C | 2.7°C | 23.8°C | -1.4°C | 36 mm | 55% | 1.9 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 17.4°C with lows near 4.9°C (mean 11.1°C), based on 45 years of NASA POWER data.
October averages 28 mm of rainfall in Boise, about average for rainfall. The wettest on record was 72 mm in 2021.
The hottest October reached 33.5°C in 2010. The coldest dipped to -7.8°C in 2002.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 3.4°C. Daytime highs moved from 15.2°C to 19°C and overnight lows from 3.1°C to 6.2°C over the same span.
October is close to Boise's year-round average and about average for rainfall, so plan for around 17.4°C daytime highs and 4.9°C at night.
Not quite — October is the 7th coolest month in Boise, averaging 11.1°C.
For October in Boise, pack warm layers and a jacket for chilly mornings, with typical highs of 17.4°C and lows of 4.9°C.
Relative humidity in October averages 48% — relatively dry.
Average wind speed in October is 2 m/s. The windiest October on record averaged 2.5 m/s (2001).
The wettest October on record was 2021 with 72 mm. On average, October sees 28 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 Boise 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.
