Lewistown weather in October: Lewistown, Montana: normal highs, lows, rain and records for October
Lewistown in October has a normal high of 56°F and a normal low of 31°F, a daily mean of 43°F, falling from 63°F on the 1st to 49°F by the 31st. Measurable precipitation falls on 9 days in a normal October, 1.27 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 13°C and low of −1°C, 32 mm of precipitation in October.
- NOAA stationLewistown Municipal Airport
- Station IDUSW00024036
- Location47.05°N 109.46°W
- Elevation4,145 ft (1,263 m)
- Population6,204
- Jan 34° 13°
- Feb 35° 14°
- Mar 44° 21°
- Apr 53° 29°
- May 63° 37°
- Jun 71° 45°
- Jul 82° 51°
- Aug 81° 50°
- Sep 70° 42°
- Oct 56° 31°
- Nov 43° 21°
- Dec 35° 14°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Lewistown in October?
The normal high is 56°F and the normal low 31°F, for a daily mean of 43.4°F. October is 12.5°F cooler than September and 11.3°F warmer than November. October is the 6th warmest month of the year in Lewistown and the 7th wettest. Across the month the normal high falls 14°F, from 63°F on October 1 to 49°F on October 31. From one year to the next October's mean temperature typically moves about 3.8°F either way (NOAA's standard deviation), so roughly two Octobers in three average between 40°F and 47°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 31%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| October 1 | 63°F | 37°F | 31% | 14% |
| October 8 | 60°F | 34°F | 31% | 13% |
| October 15 | 56°F | 31°F | 30% | 12% |
| October 22 | 53°F | 28°F | 29% | 11% |
| October 31 | 49°F | 25°F | 28% | 10% |
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 | 63°F | 37°F | 31% | 14% | 11 h 50 min |
| October 2 | 63°F | 36°F | 31% | 14% | 11 h 40 min |
| October 3 | 62°F | 36°F | 31% | 14% | 11 h 40 min |
| October 4 | 62°F | 35°F | 31% | 14% | 11 h 40 min |
| October 5 | 61°F | 35°F | 31% | 14% | 11 h 30 min |
| October 6 | 61°F | 35°F | 31% | 14% | 11 h 30 min |
| October 7 | 60°F | 34°F | 31% | 14% | 11 h 30 min |
| October 8 | 60°F | 34°F | 31% | 13% | 11 h 20 min |
| October 9 | 59°F | 34°F | 31% | 13% | 11 h 20 min |
| October 10 | 59°F | 33°F | 31% | 13% | 11 h 20 min |
| October 11 | 58°F | 33°F | 31% | 13% | 11 h 10 min |
| October 12 | 58°F | 32°F | 30% | 13% | 11 h 10 min |
| October 13 | 57°F | 32°F | 30% | 13% | 11 h 10 min |
| October 14 | 57°F | 32°F | 30% | 12% | 11 h |
| October 15 | 56°F | 31°F | 30% | 12% | 11 h |
| October 16 | 56°F | 31°F | 30% | 12% | 11 h |
| October 17 | 55°F | 30°F | 30% | 12% | 10 h 50 min |
| October 18 | 55°F | 30°F | 30% | 12% | 10 h 50 min |
| October 19 | 54°F | 30°F | 30% | 12% | 10 h 50 min |
| October 20 | 54°F | 29°F | 29% | 12% | 10 h 40 min |
| October 21 | 54°F | 29°F | 29% | 11% | 10 h 40 min |
| October 22 | 53°F | 28°F | 29% | 11% | 10 h 40 min |
| October 23 | 53°F | 28°F | 29% | 11% | 10 h 30 min |
| October 24 | 52°F | 28°F | 29% | 11% | 10 h 30 min |
| October 25 | 52°F | 27°F | 29% | 11% | 10 h 30 min |
| October 26 | 51°F | 27°F | 29% | 11% | 10 h 20 min |
| October 27 | 51°F | 27°F | 29% | 11% | 10 h 20 min |
| October 28 | 51°F | 26°F | 29% | 10% | 10 h 20 min |
| October 29 | 50°F | 26°F | 28% | 10% | 10 h 10 min |
| October 30 | 50°F | 26°F | 28% | 10% | 10 h 10 min |
| October 31 | 49°F | 25°F | 28% | 10% | 10 h 10 min |
- Normal high
- 56°FOctober average
- Normal low
- 31°FOctober average
- Precipitation
- 1.27 inmonth total
- Days with precipitation
- 90.01 inch or more
- Nights at 32°F or colder
- 17
- Daylight
- 11 h 50 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
- 73%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024036; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Lewistown in October?
On a given October day the chance of 0.01 inch or more is 30% on average, highest around October 2 (31%). In all, 1.27 in falls on 9 days of a normal October.
In a normal October in Lewistown, 17 nights fall to freezing and 2 days stay below freezing all day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024036.
How humid and windy is Lewistown in October?
At 3 p.m. the normal temperature is 46°F with 41% relative humidity and a dew point of 23°F; at 6 a.m. it is 32°F with 66% humidity. The wind averages 10.1 mph, most often from the west in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 32°F | 22°F | 66% | 9.0 mph | – |
| 9 a.m. | 37°F | 24°F | 58% | 9.9 mph | – |
| noon | 45°F | 24°F | 43% | 12.3 mph | – |
| 3 p.m. | 46°F | 23°F | 41% | 12.0 mph | – |
| 6 p.m. | 38°F | 24°F | 56% | 9.5 mph | – |
| 9 p.m. | 35°F | 23°F | 62% | 9.3 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024036. 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 Lewistown?
The warmest October temperature on this station's record (since 1896) is 92°F, on October 4, 1905; the coldest is −10°F, on October 30, 1935. The wettest October brought 4.01 in (2016); the snowiest, 20.0 inches (1954).
The October mean against the 1991-2020 normal of 43.4°F: 2021 46.9°F (+3.5), 2022 47.7°F (+4.3), 2023 41.9°F (−1.5), 2024 49.7°F (+6.3), 2025 44.7°F (+1.3). 4 of 5 ran warmer than normal.
| October | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 46.9°F | +3.5°F | 0.57 in |
| 2022 | 47.7°F | +4.3°F | 1.90 in |
| 2023 | 41.9°F | −1.5°F | 1.41 in |
| 2024 | 49.7°F | +6.3°F | 0.31 in |
| 2025 | 44.7°F | +1.3°F | 1.25 in |
Source: records: ACIS, station USW00024036; recent months: ACIS, station USW00024036. Records and recent months use complete months only.
How does October in Lewistown 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; Lewistown's is 56°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.