Gillette, Wyoming Weather
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Climate of Gillette: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Gillette, with average daytime highs around 32°C. February is the coolest, when nights typically fall to about -9°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 41°C, so the seasons feel very different from each other.
The area receives about 390 mm of rain in a typical year. Rainfall is modest in every month; May is the wettest at about 79 mm. The driest stretch is November to February, with under 20 mm a month.
For outdoor plans and travel, May to September usually offer the most comfortable weather in Gillette, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 2° | -8° | 13 mm | 71% |
| Feb | 3° | -9° | 17 mm | 68% |
| Mar | 9° | -4° | 24 mm | 62% |
| Apr | 14° | 0° | 45 mm | 59% |
| May | 20° | 5° | 79 mm | 58% |
| Jun | 27° | 11° | 53 mm | 53% |
| Jul | 32° | 16° | 39 mm | 46% |
| Aug | 30° | 15° | 29 mm | 45% |
| Sep | 24° | 9° | 29 mm | 47% |
| Oct | 14° | 1° | 32 mm | 59% |
| Nov | 7° | -4° | 14 mm | 63% |
| Dec | 1° | -8° | 13 mm | 71% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Gillette. Values describe typical conditions, not a forecast.
About Gillette weather
Gillette sits within Wyoming's high-plains and mountain climate, exposed and wind-prone, about 173 km north of Casper. Conditions turn hot with warm days and cool nights (June–August). By December, expect long, cold, windy winters (November–March) with significant snowfall. This page shows live, auto-refreshing weather for Gillette: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Denver.
Frequently asked questions
Gillette is about 173 km north of Casper, in Wyoming.
Gillette sees long, cold, windy winters (November–March) with significant snowfall.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Gillette's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Gillette, with average daytime highs of about 32°C and nights around 16°C.
The coldest nights come in February, when the average low is about -9°C and daytime highs reach around 3°C. Frost is possible on clear, calm nights.
Gillette receives about 390 mm of rain in a typical year. May is the wettest month at roughly 79 mm; no month averages more than 100 mm.
May to September usually offer the most comfortable weather in Gillette, with mild daytime temperatures and little rain.
In November Gillette typically sees daytime highs near 7°C and lows near -4°C, with about 14 mm of rain over the month and average humidity around 63%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Gillette is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Gillette's day-to-day weather follows the broader pattern of Wyoming described above. See the hourly weather forecast or the air quality index for more detail.