Billings weather in September: Billings, Montana: normal highs, lows, rain and records for September
Billings in September has a normal high of 74°F and a normal low of 49°F, a daily mean of 61°F, falling from 81°F on the 1st to 67°F by the 30th. Measurable precipitation falls on 7 days in a normal September, 1.36 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 9°C, 35 mm of precipitation and 1 cm of snow in September.
- NOAA stationBillings International Airport
- Station IDUSW00024033
- Location45.81°N 108.54°W
- Elevation3,581 ft (1,092 m)
- From the center1 miles
- Population121,483
- Jan 36° 18°
- Feb 39° 20°
- Mar 49° 27°
- Apr 57° 35°
- May 67° 44°
- Jun 77° 52°
- Jul 87° 59°
- Aug 86° 58°
- Sep 74° 49°
- Oct 59° 37°
- Nov 46° 27°
- Dec 36° 19°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Billings in September?
The normal high is 74°F and the normal low 49°F, for a daily mean of 61.4°F. September is 10.2°F cooler than August and 13.5°F warmer than October. September is the 4th warmest month of the year in Billings and the 5th wettest. Across the month the normal high falls 14°F, from 81°F on September 1 to 67°F on September 30. From one year to the next September's mean temperature typically moves about 2.8°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 59°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 25%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 81°F | 53°F | 21% | 9% |
| September 8 | 78°F | 51°F | 22% | 10% |
| September 15 | 75°F | 49°F | 23% | 12% |
| September 22 | 71°F | 47°F | 25% | 12% |
| September 30 | 67°F | 44°F | 25% | 12% |
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 | 81°F | 53°F | 21% | 9% | 13 h 20 min |
| September 2 | 80°F | 53°F | 21% | 9% | 13 h 20 min |
| September 3 | 80°F | 53°F | 21% | 9% | 13 h 10 min |
| September 4 | 80°F | 52°F | 21% | 10% | 13 h 10 min |
| September 5 | 79°F | 52°F | 21% | 10% | 13 h 10 min |
| September 6 | 79°F | 52°F | 22% | 10% | 13 h 10 min |
| September 7 | 78°F | 51°F | 22% | 10% | 13 h |
| September 8 | 78°F | 51°F | 22% | 10% | 13 h |
| September 9 | 78°F | 51°F | 22% | 11% | 13 h |
| September 10 | 77°F | 50°F | 22% | 11% | 12 h 50 min |
| September 11 | 77°F | 50°F | 23% | 11% | 12 h 50 min |
| September 12 | 76°F | 50°F | 23% | 11% | 12 h 50 min |
| September 13 | 76°F | 50°F | 23% | 11% | 12 h 40 min |
| September 14 | 75°F | 49°F | 23% | 11% | 12 h 40 min |
| September 15 | 75°F | 49°F | 23% | 12% | 12 h 40 min |
| September 16 | 74°F | 49°F | 24% | 12% | 12 h 30 min |
| September 17 | 74°F | 48°F | 24% | 12% | 12 h 30 min |
| September 18 | 73°F | 48°F | 24% | 12% | 12 h 30 min |
| September 19 | 73°F | 48°F | 24% | 12% | 12 h 20 min |
| September 20 | 72°F | 47°F | 24% | 12% | 12 h 20 min |
| September 21 | 72°F | 47°F | 24% | 12% | 12 h 20 min |
| September 22 | 71°F | 47°F | 25% | 12% | 12 h 10 min |
| September 23 | 71°F | 46°F | 25% | 12% | 12 h 10 min |
| September 24 | 70°F | 46°F | 25% | 12% | 12 h 10 min |
| September 25 | 70°F | 46°F | 25% | 12% | 12 h 10 min |
| September 26 | 69°F | 45°F | 25% | 12% | 12 h |
| September 27 | 69°F | 45°F | 25% | 12% | 12 h |
| September 28 | 68°F | 44°F | 25% | 12% | 12 h |
| September 29 | 68°F | 44°F | 25% | 12% | 11 h 50 min |
| September 30 | 67°F | 44°F | 25% | 12% | 11 h 50 min |
- Normal high
- 74°FSeptember average
- Normal low
- 49°FSeptember average
- Precipitation
- 1.36 inmonth total
- Days with precipitation
- 70.01 inch or more
- Snowfall
- 0.3 inmonth total
- Days at 90°F or more
- 3
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 20
- Days at 80°F or more
- 11
- Sunshine
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024033; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Billings in September?
On a given September day the chance of 0.01 inch or more is 23% on average, highest around September 30 (25%). In all, 1.36 in falls on 7 days of a normal September.
In a normal September in Billings, 3 days reach 90°F and snowfall averages 0.3 inches.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024033.
How humid and windy is Billings in September?
At 3 p.m. the normal temperature is 66°F with 32% relative humidity and a dew point of 35°F; at 6 a.m. it is 47°F with 63% humidity. The wind averages 10.0 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. | 47°F | 34°F | 63% | 10.1 mph | 60% |
| 9 a.m. | 52°F | 36°F | 55% | 10.5 mph | 56% |
| noon | 62°F | 36°F | 37% | 10.8 mph | 54% |
| 3 p.m. | 66°F | 35°F | 32% | 11.4 mph | 49% |
| 6 p.m. | 60°F | 36°F | 39% | 8.9 mph | 50% |
| 9 p.m. | 55°F | 35°F | 47% | 9.0 mph | 61% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024033. 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 Billings?
The warmest September temperature on Billings's official record (since 1934) is 103°F, on September 1, 1983; the coldest is 22°F, on September 24, 1984. The wettest September brought 4.99 in (1941); the snowiest, 9.3 inches (1984).
The September mean against the 1991-2020 normal of 61.4°F: 2021 65.2°F (+3.8), 2022 67.1°F (+5.7), 2023 64.9°F (+3.5), 2024 66.8°F (+5.4), 2025 65.7°F (+4.3), 2026 63.2°F (+1.8). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 65.2°F | +3.8°F | 0.04 in |
| 2022 | 67.1°F | +5.7°F | 1.17 in |
| 2023 | 64.9°F | +3.5°F | 0.57 in |
| 2024 | 66.8°F | +5.4°F | 1.72 in |
| 2025 | 65.7°F | +4.3°F | 0.94 in |
| 2026 | 63.2°F | +1.8°F | 4.63 in |
Source: records: ACIS, NWS threaded record BILthr; recent months: ACIS, station USW00024033. Records and recent months use complete months only.
How does September in Billings 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; Billings's is 74°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.