Great Falls weather in October: Great Falls, Montana: normal highs, lows, rain and records for October
Great Falls in October has a normal high of 57°F and a normal low of 33°F, a daily mean of 45°F, falling from 65°F on the 1st to 50°F by the 31st. Measurable precipitation falls on 7 days in a normal October, 1.07 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 14°C and low of 0°C, 27 mm of precipitation and 13 cm of snow in October.
- NOAA stationGreat Falls Airport
- Station IDUSW00024143
- Location47.47°N 111.38°W
- Elevation3,664 ft (1,117 m)
- From the center4 miles
- Population60,013
- Jan 35° 15°
- Feb 37° 15°
- Mar 46° 22°
- Apr 55° 30°
- May 65° 38°
- Jun 73° 46°
- Jul 84° 51°
- Aug 83° 50°
- Sep 72° 43°
- Oct 57° 33°
- Nov 44° 24°
- Dec 36° 16°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Great Falls in October?
The normal high is 57°F and the normal low 33°F, for a daily mean of 44.8°F. October is 12.4°F cooler than September and 11.2°F warmer than November. October is the 6th warmest month of the year in Great Falls and the 7th wettest. Across the month the normal high falls 15°F, from 65°F on October 1 to 50°F on October 31. From one year to the next October's mean temperature typically moves about 3.5°F either way (NOAA's standard deviation), so roughly two Octobers in three average between 41°F and 48°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 24%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| October 1 | 65°F | 38°F | 24% | 11% |
| October 8 | 61°F | 36°F | 24% | 11% |
| October 15 | 57°F | 33°F | 23% | 10% |
| October 22 | 54°F | 30°F | 23% | 9% |
| October 31 | 50°F | 28°F | 23% | 8% |
Every day of October: normal high, low and chance of precipitation (warmest afternoon October 1, coldest night October 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| October 1 | 65°F | 38°F | 24% | 11% | 11 h 40 min |
| October 2 | 64°F | 38°F | 24% | 11% | 11 h 40 min |
| October 3 | 64°F | 37°F | 24% | 11% | 11 h 40 min |
| October 4 | 63°F | 37°F | 24% | 11% | 11 h 30 min |
| October 5 | 63°F | 37°F | 24% | 11% | 11 h 30 min |
| October 6 | 62°F | 36°F | 24% | 11% | 11 h 30 min |
| October 7 | 62°F | 36°F | 24% | 11% | 11 h 20 min |
| October 8 | 61°F | 36°F | 24% | 11% | 11 h 20 min |
| October 9 | 61°F | 35°F | 24% | 11% | 11 h 20 min |
| October 10 | 60°F | 35°F | 24% | 11% | 11 h 10 min |
| October 11 | 60°F | 34°F | 24% | 10% | 11 h 10 min |
| October 12 | 59°F | 34°F | 24% | 10% | 11 h 10 min |
| October 13 | 58°F | 34°F | 24% | 10% | 11 h |
| October 14 | 58°F | 33°F | 24% | 10% | 11 h |
| October 15 | 57°F | 33°F | 23% | 10% | 11 h |
| October 16 | 57°F | 33°F | 23% | 10% | 10 h 50 min |
| October 17 | 56°F | 32°F | 23% | 10% | 10 h 50 min |
| October 18 | 56°F | 32°F | 23% | 10% | 10 h 50 min |
| October 19 | 55°F | 31°F | 23% | 10% | 10 h 40 min |
| October 20 | 55°F | 31°F | 23% | 10% | 10 h 40 min |
| October 21 | 54°F | 31°F | 23% | 9% | 10 h 40 min |
| October 22 | 54°F | 30°F | 23% | 9% | 10 h 30 min |
| October 23 | 53°F | 30°F | 23% | 9% | 10 h 30 min |
| October 24 | 53°F | 30°F | 23% | 9% | 10 h 30 min |
| October 25 | 52°F | 29°F | 23% | 9% | 10 h 20 min |
| October 26 | 52°F | 29°F | 23% | 9% | 10 h 20 min |
| October 27 | 52°F | 29°F | 23% | 9% | 10 h 20 min |
| October 28 | 51°F | 28°F | 23% | 9% | 10 h 20 min |
| October 29 | 51°F | 28°F | 23% | 9% | 10 h 10 min |
| October 30 | 50°F | 28°F | 23% | 8% | 10 h 10 min |
| October 31 | 50°F | 28°F | 23% | 8% | 10 h 10 min |
- Normal high
- 57°FOctober average
- Normal low
- 33°FOctober average
- Precipitation
- 1.07 inmonth total
- Days with precipitation
- 70.01 inch or more
- Snowfall
- 5.2 inmonth total
- Nights at 32°F or colder
- 15
- Daylight
- 11 h 40 min to 10 h 10 minOctober 1 to October 31
- Days at 70°F or more
- 5
- Days at 80°F or more
- 1
- Sunshine
- 72%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024143; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Great Falls in October?
On a given October day the chance of 0.01 inch or more is 23% on average, highest around October 1 (24%). In all, 1.07 in falls on 7 days of a normal October.
In a normal October in Great Falls, 15 nights fall to freezing, 2 days stay below freezing all day and snowfall averages 5.2 inches.
Snow falls on 3 days in a normal October, and an inch or more covers the ground on 3 days.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024143.
How humid and windy is Great Falls in October?
At 3 p.m. the normal temperature is 47°F with 41% relative humidity and a dew point of 24°F; at 6 a.m. it is 34°F with 64% humidity. The wind averages 12.7 mph, most often from the west-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 34°F | 24°F | 64% | 11.8 mph | 65% |
| 9 a.m. | 39°F | 25°F | 58% | 12.4 mph | 60% |
| noon | 45°F | 25°F | 44% | 15.7 mph | 62% |
| 3 p.m. | 47°F | 24°F | 41% | 15.5 mph | 63% |
| 6 p.m. | 40°F | 24°F | 54% | 11.4 mph | 63% |
| 9 p.m. | 37°F | 24°F | 60% | 11.4 mph | 67% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024143. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for October in Great Falls?
The warmest October temperature on Great Falls's official record (since 1891) is 91°F, on October 3, 1943; the coldest is −11°F, on October 30, 1991. The wettest October brought 3.43 in (1975); the snowiest, 28.0 inches (2020).
The October mean against the 1991-2020 normal of 44.8°F: 2021 48.0°F (+3.3), 2022 49.4°F (+4.6), 2023 44.2°F (−0.6), 2024 51.4°F (+6.6), 2025 46.4°F (+1.6). 4 of 5 ran warmer than normal.
| October | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 48.0°F | +3.3°F | 0.10 in |
| 2022 | 49.4°F | +4.6°F | 1.56 in |
| 2023 | 44.2°F | −0.6°F | 1.81 in |
| 2024 | 51.4°F | +6.6°F | 0.18 in |
| 2025 | 46.4°F | +1.6°F | 0.96 in |
Source: records: ACIS, NWS threaded record GTFthr; recent months: ACIS, station USW00024143. Records and recent months use complete months only.
How does October in Great Falls compare across Montana?
Across the 141 places PlainClimate covers in Montana, October normal highs run from 47°F in Cooke City to 64°F in Hardin; Great Falls's is 57°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.