Miles City weather in September: Miles City, Montana: normal highs, lows, rain and records for September
Miles City in September has a normal high of 76°F and a normal low of 47°F, a daily mean of 61°F, falling from 82°F on the 1st to 68°F by the 30th. Measurable precipitation falls on 7 days in a normal September, 1.07 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 8°C, 27 mm of precipitation in September.
- NOAA stationMiles City F Wiley Field
- Station IDUSW00024037
- Location46.43°N 105.88°W
- Elevation2,624 ft (800 m)
- Population8,407
- Jan 30° 9°
- Feb 35° 13°
- Mar 47° 23°
- Apr 58° 33°
- May 68° 43°
- Jun 79° 53°
- Jul 89° 60°
- Aug 87° 58°
- Sep 76° 47°
- Oct 59° 34°
- Nov 44° 21°
- Dec 33° 12°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Miles City in September?
The normal high is 76°F and the normal low 47°F, for a daily mean of 61.2°F. September is 11.3°F cooler than August and 14.8°F warmer than October. September is the 4th warmest month of the year in Miles City and the 5th wettest. Across the month the normal high falls 14°F, from 82°F on September 1 to 68°F on September 30. From one year to the next September's mean temperature typically moves about 3.1°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 58°F and 64°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 23%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 82°F | 52°F | 21% | 9% |
| September 8 | 79°F | 50°F | 22% | 9% |
| September 15 | 76°F | 47°F | 22% | 9% |
| September 22 | 73°F | 45°F | 23% | 9% |
| September 30 | 68°F | 41°F | 23% | 9% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 82°F | 52°F | 21% | 9% | 13 h 20 min |
| September 2 | 82°F | 52°F | 21% | 9% | 13 h 20 min |
| September 3 | 81°F | 52°F | 21% | 9% | 13 h 20 min |
| September 4 | 81°F | 51°F | 21% | 9% | 13 h 10 min |
| September 5 | 81°F | 51°F | 22% | 9% | 13 h 10 min |
| September 6 | 80°F | 51°F | 22% | 9% | 13 h 10 min |
| September 7 | 80°F | 50°F | 22% | 9% | 13 h |
| September 8 | 79°F | 50°F | 22% | 9% | 13 h |
| September 9 | 79°F | 49°F | 22% | 9% | 13 h |
| September 10 | 78°F | 49°F | 22% | 9% | 12 h 50 min |
| September 11 | 78°F | 49°F | 22% | 9% | 12 h 50 min |
| September 12 | 78°F | 48°F | 22% | 9% | 12 h 50 min |
| September 13 | 77°F | 48°F | 22% | 9% | 12 h 40 min |
| September 14 | 77°F | 48°F | 22% | 9% | 12 h 40 min |
| September 15 | 76°F | 47°F | 22% | 9% | 12 h 40 min |
| September 16 | 76°F | 47°F | 22% | 9% | 12 h 30 min |
| September 17 | 75°F | 46°F | 22% | 9% | 12 h 30 min |
| September 18 | 75°F | 46°F | 22% | 9% | 12 h 30 min |
| September 19 | 74°F | 46°F | 23% | 9% | 12 h 20 min |
| September 20 | 74°F | 45°F | 23% | 9% | 12 h 20 min |
| September 21 | 73°F | 45°F | 23% | 9% | 12 h 20 min |
| September 22 | 73°F | 45°F | 23% | 9% | 12 h 20 min |
| September 23 | 72°F | 44°F | 23% | 9% | 12 h 10 min |
| September 24 | 72°F | 44°F | 23% | 9% | 12 h 10 min |
| September 25 | 71°F | 43°F | 23% | 9% | 12 h 10 min |
| September 26 | 70°F | 43°F | 23% | 9% | 12 h |
| September 27 | 70°F | 43°F | 23% | 9% | 12 h |
| September 28 | 69°F | 42°F | 23% | 9% | 12 h |
| September 29 | 69°F | 42°F | 23% | 9% | 11 h 50 min |
| September 30 | 68°F | 41°F | 23% | 9% | 11 h 50 min |
- Normal high
- 76°FSeptember average
- Normal low
- 47°FSeptember average
- Precipitation
- 1.07 inmonth total
- Days with precipitation
- 70.01 inch or more
- Days at 90°F or more
- 4
- Nights at 32°F or colder
- 1
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 21
- Days at 80°F or more
- 12
- Sunshine
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024037; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Miles City in September?
On a given September day the chance of 0.01 inch or more is 22% on average, highest around September 30 (23%). In all, 1.07 in falls on 7 days of a normal September.
In a normal September in Miles City, 4 days reach 90°F and 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024037.
How humid and windy is Miles City in September?
At 3 p.m. the normal temperature is 67°F with 32% relative humidity and a dew point of 36°F; at 6 a.m. it is 44°F with 73% humidity. The wind averages 9.6 mph, most often from the northwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 44°F | 36°F | 73% | 8.1 mph | 68% |
| 9 a.m. | 53°F | 38°F | 56% | 10.0 mph | 68% |
| noon | 63°F | 37°F | 38% | 11.5 mph | 67% |
| 3 p.m. | 67°F | 36°F | 32% | 12.3 mph | 66% |
| 6 p.m. | 60°F | 36°F | 41% | 8.7 mph | 69% |
| 9 p.m. | 53°F | 37°F | 53% | 8.7 mph | 71% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024037. 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 September in Miles City?
The warmest September temperature on this station's record (since 1937) is 106°F, on September 1, 1983; the coldest is 19°F, on September 21, 1995. The wettest September brought 4.67 in (1941); the snowiest, 7.1 inches (1972).
The September mean against the 1991-2020 normal of 61.2°F: 2021 63.0°F (+1.8), 2022 66.6°F (+5.4), 2023 65.6°F (+4.4), 2024 67.1°F (+5.9), 2025 65.9°F (+4.7), 2026 65.2°F (+4.0). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.0°F | +1.8°F | 0.65 in |
| 2022 | 66.6°F | +5.4°F | 0.20 in |
| 2023 | 65.6°F | +4.4°F | 2.40 in |
| 2024 | 67.1°F | +5.9°F | 0.31 in |
| 2025 | 65.9°F | +4.7°F | 0.72 in |
| 2026 | 65.2°F | +4.0°F | 2.30 in |
Source: records: ACIS, station USW00024037; recent months: ACIS, station USW00024037. Records and recent months use complete months only.
How does September in Miles City compare across Montana?
Across the 141 places PlainClimate covers in Montana, September normal highs run from 62°F in Cooke City to 79°F in Hardin; Miles City's is 76°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.