Gillette weather in September: Gillette, Wyoming: normal highs, lows, rain and records for September
Gillette in September has a normal high of 75°F and a normal low of 44°F, a daily mean of 59°F, falling from 82°F on the 1st to 67°F by the 30th. Measurable precipitation falls on 7 days in a normal September, 0.98 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 7°C, 25 mm of precipitation in September.
- NOAA stationGillette Campbell Airport
- Station IDUSW00094023
- Location44.34°N 105.54°W
- Elevation4,354 ft (1,327 m)
- Population33,846
- Jan 36° 14°
- Feb 37° 15°
- Mar 48° 23°
- Apr 55° 30°
- May 65° 39°
- Jun 77° 48°
- Jul 87° 56°
- Aug 86° 54°
- Sep 75° 44°
- Oct 59° 32°
- Nov 46° 22°
- Dec 36° 15°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Gillette in September?
The normal high is 75°F and the normal low 44°F, for a daily mean of 59.4°F. September is 10.4°F cooler than August and 13.9°F warmer than October. September is the 4th warmest month of the year in Gillette and the 6th wettest. Across the month the normal high falls 15°F, from 82°F on September 1 to 67°F on September 30. From one year to the next September's mean temperature typically moves about 2.9°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 57°F and 62°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 28%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 82°F | 49°F | 21% | 9% |
| September 8 | 79°F | 47°F | 22% | 9% |
| September 15 | 75°F | 45°F | 25% | 10% |
| September 22 | 71°F | 42°F | 26% | 11% |
| September 30 | 67°F | 39°F | 28% | 11% |
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 | 49°F | 21% | 9% | 13 h 20 min |
| September 2 | 81°F | 49°F | 21% | 9% | 13 h 10 min |
| September 3 | 81°F | 49°F | 21% | 9% | 13 h 10 min |
| September 4 | 81°F | 48°F | 21% | 9% | 13 h 10 min |
| September 5 | 80°F | 48°F | 21% | 9% | 13 h 10 min |
| September 6 | 80°F | 48°F | 22% | 9% | 13 h |
| September 7 | 79°F | 47°F | 22% | 9% | 13 h |
| September 8 | 79°F | 47°F | 22% | 9% | 13 h |
| September 9 | 78°F | 47°F | 23% | 9% | 12 h 50 min |
| September 10 | 78°F | 46°F | 23% | 10% | 12 h 50 min |
| September 11 | 77°F | 46°F | 23% | 10% | 12 h 50 min |
| September 12 | 77°F | 46°F | 24% | 10% | 12 h 40 min |
| September 13 | 76°F | 45°F | 24% | 10% | 12 h 40 min |
| September 14 | 76°F | 45°F | 24% | 10% | 12 h 40 min |
| September 15 | 75°F | 45°F | 25% | 10% | 12 h 40 min |
| September 16 | 75°F | 44°F | 25% | 10% | 12 h 30 min |
| September 17 | 74°F | 44°F | 25% | 10% | 12 h 30 min |
| September 18 | 74°F | 43°F | 25% | 10% | 12 h 30 min |
| September 19 | 73°F | 43°F | 26% | 10% | 12 h 20 min |
| September 20 | 73°F | 43°F | 26% | 11% | 12 h 20 min |
| September 21 | 72°F | 42°F | 26% | 11% | 12 h 20 min |
| September 22 | 71°F | 42°F | 26% | 11% | 12 h 10 min |
| September 23 | 71°F | 42°F | 27% | 11% | 12 h 10 min |
| September 24 | 70°F | 41°F | 27% | 11% | 12 h 10 min |
| September 25 | 70°F | 41°F | 27% | 11% | 12 h 10 min |
| September 26 | 69°F | 40°F | 27% | 11% | 12 h |
| September 27 | 68°F | 40°F | 27% | 11% | 12 h |
| September 28 | 68°F | 40°F | 27% | 11% | 12 h |
| September 29 | 67°F | 39°F | 28% | 11% | 11 h 50 min |
| September 30 | 67°F | 39°F | 28% | 11% | 11 h 50 min |
- Normal high
- 75°FSeptember average
- Normal low
- 44°FSeptember average
- Precipitation
- 0.98 inmonth total
- Days with precipitation
- 70.01 inch or more
- Days at 90°F or more
- 4
- Nights at 32°F or colder
- 2
- 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
- 82%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094023; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Gillette in September?
On a given September day the chance of 0.01 inch or more is 24% on average, highest around September 30 (28%). In all, 0.98 in falls on 7 days of a normal September.
In a normal September in Gillette, 4 days reach 90°F and 2 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094023.
How humid and windy is Gillette in September?
At 3 p.m. the normal temperature is 65°F with 30% relative humidity and a dew point of 33°F; at 6 a.m. it is 44°F with 67% humidity. The wind averages 9.8 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 | 34°F | 67% | 8.2 mph | – |
| 9 a.m. | 56°F | 36°F | 47% | 11.3 mph | – |
| noon | 63°F | 34°F | 34% | 11.8 mph | – |
| 3 p.m. | 65°F | 33°F | 30% | 11.8 mph | – |
| 6 p.m. | 55°F | 35°F | 46% | 8.3 mph | – |
| 9 p.m. | 48°F | 34°F | 58% | 8.7 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094023. 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 Gillette?
The September mean against the 1991-2020 normal of 59.4°F: 2021 63.8°F (+4.4), 2022 64.4°F (+5.0), 2023 63.6°F (+4.2), 2024 66.4°F (+7.0), 2025 64.1°F (+4.7), 2026 63.6°F (+4.2). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.8°F | +4.4°F | 0.49 in |
| 2022 | 64.4°F | +5.0°F | 1.74 in |
| 2023 | 63.6°F | +4.2°F | 1.54 in |
| 2024 | 66.4°F | +7.0°F | 0.12 in |
| 2025 | 64.1°F | +4.7°F | 0.43 in |
| 2026 | 63.6°F | +4.2°F | 0.41 in |
Source: recent months: ACIS, station USW00094023. Records and recent months use complete months only.
How does September in Gillette compare across Wyoming?
Across the 71 places PlainClimate covers in Wyoming, September normal highs run from 65°F in Sundance to 81°F in Yoder; Gillette's is 75°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.