October is close to Great Falls's year-round average, with average highs near 13.3°C and lows around 1.4°C (mean 7.4°C). It is about average for rainfall, averaging 32 mm of rainfall and 63% relative humidity across the period.
October is close to Great Falls's year-round average. Across 45 years of records, the warmest Octobers in Great Falls were 2014 and 2024 — when the month averaged 10.9°C — while the coldest was 2009 at 2.7°C. Typical October days reach 13.3°C with nights near 1.4°C. The long-term trend is warming, about 0.2°C per decade.
October is about average for rainfall in Great Falls, averaging 32 mm of rainfall. The wettest October on record was 2016 with 65 mm, while the driest was 1987 at 3 mm.
Relative humidity in Great Falls during October averages 63%. The most humid Octobers were 2009 and 2016 at 71%, and the least humid was 1987 at 50%.
October receives about 2.8 kWh/m²/day of solar energy in Great Falls. The sunniest October was 2024 at 3.3 kWh/m²/day, and the cloudiest was 2016 at 2.2.
Average wind speed in Great Falls during October is 2.8 m/s. The windiest Octobers were 1985, 1990 and 2017 at 3.7 m/s, while the calmest were 1986 and 1987 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.3°C | 7.1°C | 6.9°C | 7.5°C | 8.5°C | +1.2°C |
| Avg High | 13.5°C | 13.0°C | 12.9°C | 13.3°C | 14.5°C | +1°C |
| Avg Low | 1.1°C | 1.2°C | 0.9°C | 1.7°C | 2.5°C | +1.4°C |
| Avg Rain | 25 mm | 29 mm | 32 mm | 39 mm | 34 mm | +9 mm |
October temperatures in Great Falls have risen by about 2.8°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -16.5°C (1991) to a record high of 29.9°C (2010).
Rainfall in October is about average for rainfall, averaging 32 mm, with a wettest year of 65 mm.
A good time to visit Great Falls
October is a good time to visit Great Falls, with days averaging 13.3°C and nights around 1.4°C (mean 7.4°C, close to Great 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 | 14.0°C | 8.1°C | 2.2°C | 24.3°C | -3.7°C | 29 mm | 62% | 2.8 m/s | 2.8 |
| 2024 | 17.7°C | 10.9°C | 4.2°C | 27.4°C | -2.9°C | 6 mm | 55% | 2.7 m/s | 3.3 |
| 2023 | 12.7°C | 7.0°C | 1.3°C | 25.6°C | -15.0°C | 48 mm | 70% | 2.4 m/s | 2.7 |
| 2022 | 15.9°C | 10.0°C | 4.2°C | 24.2°C | -5.3°C | 53 mm | 63% | 2.7 m/s | 2.8 |
| 2021 | 15.4°C | 9.3°C | 3.2°C | 27.8°C | -5.5°C | 13 mm | 58% | 2.9 m/s | 2.8 |
| 2020 | 11.3°C | 5.7°C | 0.1°C | 25.1°C | -14.8°C | 53 mm | 67% | 3.2 m/s | 2.6 |
| 2019 | 8.5°C | 2.8°C | -2.9°C | 20.9°C | -13.2°C | 43 mm | 66% | 3.1 m/s | 2.8 |
| 2018 | 12.6°C | 6.7°C | 0.8°C | 21.8°C | -4.9°C | 24 mm | 66% | 2.5 m/s | 2.8 |
| 2017 | 12.1°C | 6.3°C | 0.6°C | 22.2°C | -5.2°C | 38 mm | 59% | 3.7 m/s | 2.8 |
| 2016 🌧️ | 12.8°C | 7.7°C | 2.7°C | 21.4°C | -5.4°C | 65 mm | 71% | 2.7 m/s | 2.2 |
| 2015 | 15.9°C | 9.8°C | 3.8°C | 26.5°C | -2.7°C | 28 mm | 63% | 2.4 m/s | 2.8 |
| 2014 🔥 | 16.9°C | 10.9°C | 4.9°C | 24.2°C | -2.7°C | 19 mm | 62% | 3 m/s | 2.9 |
| 2013 | 11.5°C | 5.7°C | 0.0°C | 21.0°C | -7.8°C | 49 mm | 68% | 2.6 m/s | 2.9 |
| 2012 | 11.6°C | 5.9°C | 0.3°C | 25.1°C | -6.8°C | 47 mm | 67% | 2.9 m/s | 2.5 |
| 2011 | 14.1°C | 8.5°C | 3.0°C | 28.9°C | -3.9°C | 57 mm | 66% | 2.9 m/s | 2.6 |
| 2010 | 16.8°C | 10.2°C | 3.6°C | 29.9°C | -2.5°C | 17 mm | 62% | 2.5 m/s | 3.1 |
| 2009 ❄️ | 7.7°C | 2.7°C | -2.3°C | 21.9°C | -12.5°C | 63 mm | 71% | 3 m/s | 2.3 |
| 2008 | 14.0°C | 7.8°C | 1.6°C | 27.6°C | -6.2°C | 18 mm | 59% | 2.9 m/s | 2.8 |
| 2007 | 14.3°C | 8.2°C | 2.1°C | 24.0°C | -4.4°C | 20 mm | 60% | 2.9 m/s | 2.9 |
| 2006 | 11.4°C | 5.8°C | 0.3°C | 23.9°C | -9.8°C | 43 mm | 68% | 2.8 m/s | 2.4 |
| 2005 | 14.6°C | 8.9°C | 3.2°C | 22.7°C | -1.6°C | 35 mm | 66% | 2.6 m/s | 2.8 |
| 2004 | 13.6°C | 7.4°C | 1.3°C | 23.9°C | -3.6°C | 33 mm | 66% | 2.6 m/s | 2.8 |
| 2003 | 16.5°C | 10.0°C | 3.5°C | 26.2°C | -11.7°C | 34 mm | 53% | 3.1 m/s | 3.1 |
| 2002 | 10.2°C | 4.0°C | -2.2°C | 19.0°C | -14.8°C | 21 mm | 63% | 2.4 m/s | 3 |
| 2001 | 13.2°C | 7.1°C | 1.1°C | 27.7°C | -3.9°C | 19 mm | 57% | 3.4 m/s | 2.8 |
| 2000 | 13.6°C | 7.2°C | 0.8°C | 24.8°C | -5.9°C | 31 mm | 62% | 2.4 m/s | 2.8 |
| 1999 | 14.2°C | 7.9°C | 1.7°C | 23.6°C | -4.8°C | 24 mm | 58% | 3 m/s | 2.8 |
| 1998 | 14.8°C | 8.3°C | 1.8°C | 22.7°C | -3.8°C | 16 mm | 59% | 2.4 m/s | 3.1 |
| 1997 | 12.3°C | 6.8°C | 1.3°C | 28.4°C | -5.5°C | 32 mm | 66% | 3.2 m/s | 2.5 |
| 1996 | 12.8°C | 6.8°C | 0.8°C | 26.8°C | -9.1°C | 22 mm | 60% | 2.7 m/s | 2.9 |
| 1995 | 11.1°C | 5.9°C | 0.7°C | 21.8°C | -6.8°C | 32 mm | 64% | 3.5 m/s | 2.7 |
| 1994 | 12.2°C | 6.7°C | 1.1°C | 23.3°C | -3.9°C | 49 mm | 65% | 3.1 m/s | 2.7 |
| 1993 | 13.2°C | 7.2°C | 1.2°C | 25.5°C | -6.9°C | 27 mm | 66% | 2.6 m/s | 2.8 |
| 1992 | 14.5°C | 8.3°C | 2.2°C | 29.7°C | -5.8°C | 54 mm | 62% | 2.4 m/s | 2.6 |
| 1991 | 12.1°C | 5.9°C | -0.3°C | 26.6°C | -16.5°C | 22 mm | 55% | 3 m/s | 2.9 |
| 1990 | 12.9°C | 7.1°C | 1.3°C | 26.1°C | -4.4°C | 15 mm | 56% | 3.7 m/s | 2.7 |
| 1989 | 13.1°C | 7.3°C | 1.5°C | 21.3°C | -7.9°C | 21 mm | 62% | 2.7 m/s | 2.8 |
| 1988 | 16.7°C | 10.0°C | 3.3°C | 25.5°C | -8.2°C | 21 mm | 58% | 2.5 m/s | 2.9 |
| 1987 | 15.7°C | 8.4°C | 1.1°C | 27.7°C | -6.0°C | 3 mm | 50% | 2.3 m/s | 3.1 |
| 1986 | 15.4°C | 8.7°C | 2.0°C | 22.5°C | -5.7°C | 17 mm | 63% | 2.3 m/s | 3 |
| 1985 | 11.4°C | 5.6°C | -0.1°C | 21.4°C | -13.6°C | 39 mm | 65% | 3.7 m/s | 2.5 |
| 1984 | 10.5°C | 5.0°C | -0.5°C | 25.5°C | -15.9°C | 36 mm | 62% | 2.7 m/s | 2.6 |
| 1983 | 14.7°C | 8.3°C | 2.0°C | 20.4°C | -3.0°C | 29 mm | 63% | 2.6 m/s | — |
| 1982 | 12.8°C | 6.7°C | 0.7°C | 22.5°C | -6.1°C | 21 mm | 67% | 2.7 m/s | — |
| 1981 | 11.4°C | 5.9°C | 0.3°C | 22.5°C | -6.7°C | 38 mm | 65% | 2.8 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 13.3°C with lows near 1.4°C (mean 7.4°C), based on 45 years of NASA POWER data.
October averages 32 mm of rainfall in Great Falls, about average for rainfall. The wettest on record was 65 mm in 2016.
The hottest October reached 29.9°C in 2010. The coldest dipped to -16.5°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 2.8°C. Daytime highs moved from 12.2°C to 15.1°C and overnight lows from 0.5°C to 3°C over the same span.
October is close to Great Falls's year-round average and about average for rainfall, so plan for around 13.3°C daytime highs and 1.4°C at night.
Not quite — October is the 7th coolest month in Great Falls, averaging 7.4°C.
For October in Great Falls, pack warm layers and a jacket for chilly mornings, with typical highs of 13.3°C and lows of 1.4°C.
Relative humidity in October averages 63% — moderately humid.
Average wind speed in October is 2.8 m/s. The windiest October on record averaged 3.7 m/s (1985).
The wettest October on record was 2016 with 65 mm. On average, October sees 32 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 Great 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.
