Sleepy Hollow, WY Weather

Campbell County9:03 PM MDT44.23°N, 105.43°WElevation 4,560 ft

Current conditions

Chance Rain And Snow
39°
Chance Rain And Snow
Feels like 32°
High 49° Monday·Low 30° tonight
WindSE 12 mph gusts 25 mph
Humidity79%
Dew point33°
Cloud cover42%
Sunrise7:30 AM
Sunset6:03 PM

Forecast for this hour (no station report in the last two hours)

Forecast

10-day

  • Sunday Night

    A chance of rain before 9pm, then a chance of rain and snow. Partly cloudy, with a low around 30.

  • Monday

    Partly sunny, with a high near 49.

  • Monday Night

    Mostly cloudy, with a low around 31.

National Weather Service forecast updated 4 days ago.

Hourly

Hourly forecast
  1. Now Chance Rain And Snow 39°28%
  2. 10 PM Chance Rain And Snow 38°28%
  3. 11 PM Chance Rain And Snow 37°28%
  4. Mon12 AM Slight Chance Rain And Snow 37°20%
  5. 1 AM Slight Chance Rain And Snow 36°20%
  6. 2 AM Slight Chance Rain And Snow 36°20%
  7. 3 AM Slight Chance Light Rain 35°20%
  8. 4 AM Slight Chance Light Rain 34°20%
  9. 5 AM Slight Chance Light Rain 33°20%
  10. 6 AM Partly Sunny 33°13%
  11. 7 AM Partly Sunny 33°13%
  12. 8 AM Partly Sunny 34°13%
  13. 9 AM Partly Sunny 35°13%
  14. 10 AM Partly Sunny 38°13%
  15. 11 AM Partly Sunny 41°13%
  16. 12 PM Mostly Sunny 44°
  17. 1 PM Mostly Sunny 46°
  18. 2 PM Mostly Sunny 48°
  19. 3 PM Mostly Sunny 49°
  20. 4 PM Mostly Sunny 49°
  21. 5 PM Mostly Sunny 48°
  22. 6 PM Partly Cloudy 46°
  23. 7 PM Partly Cloudy 44°
  24. 8 PM Partly Cloudy 41°

10-day forecast

Details
  1. TonightOct 21 Mostly Clear Mostly Clear48°
  2. ThuOct 22 Mostly Sunny Mostly Sunny52°75°
  3. FriOct 23 Mostly Sunny Mostly Sunny33°74°
  4. SatOct 24 Mostly Sunny Mostly Sunny31°46°
  5. TodayOct 25 Slight Chance Rain And Snow Slight Chance Rain And Snow28%30°48°
  6. MonOct 26 Partly Sunny Partly Sunny13%31°49°
  7. TueOct 27 Mostly Sunny Mostly Sunny12%32°59°
  8. WedOct 28 Mostly Sunny Mostly Sunny55°
  9. ThuOct 29 Mostly sunny Mostly sunny30°50°
  10. FriOct 30 Partly cloudy Partly cloudy32°54°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

Full map
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Weather news in Wyoming

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Air quality

28
Good
Ozone

Air quality is satisfactory, and air pollution poses little or no risk.

Gillette, WY reporting area · 2 hrs ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.

Sun & moon

Sunrise 7:30 AM
Sunset 6:03 PM
Daylight 10 h 32 min (−2 min 50 s tomorrow)
Full Moon · 100% lit
Moonrise 5:22 PM Moonset 6:59 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low55° / 31°
Record high79° (1979)
Record low6° (2020)
Wettest0.31 in (1970)
Yesterday67° / 31°
Month to date0.34 in (normal 1.31 in)

Gillette 3se, records since 1902. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in UNR, issued 9 hrs ago

Key Messages

- Light rain will continue to increase in coverage through this evening into the overnight hours. Snow may mix in with rain during the morning into the afternoon hours Monday.

- A trace to an inch of snow possible over northwestern SD and the Black Hills on Monday.

- Warming trend commences Tuesday through the end of the week with highs in the 50s to 60s

Discussion

(This Afternoon Through Saturday) Issued at 1146 AM MDT Sun Oct 25 2026

Rain showers have begun to push into the region this morning as upper low over the southwestern US moves northeastward. Large scale Q-vector convergence and moisture advection will continue to support this precip through the overnight hours into Monday. In terms of what kind of precip is going to fall, the majority will be rain. However, as the colder air associated with the upper low pushes into the region, we could see a rain/snow mix on portions of the western SD plains and a transition to snow over the Black Hills by late Monday morning. Snow will likely be falling during the afternoon hours when sfc temps will be in the mid 30s and even though the thermal profiles will support snow, they'll still be a tad warm. All of this means that we likely won't see much aside from some minor, slushy accumulations (generally around a trace to maybe an inch) that should melt quickly on the warm ground.

Upper level shortwave and attendant moisture starved front will move in from the PNW later on Tuesday. Could see some light rain showers across far northeastern WY into northwestern SD with this system with the only other impacts expected being breezy southwest winds across the western SD plains and portions of northeastern WY late Tuesday afternoon. Otherwise, upper level west- southwesterly flow will keep temperatures seasonably mild after Tuesday with dry weather expected through the late week.

Aviation

(For the 18Z TAFS Through 18Z Monday) Issued At 1132 AM MDT Sun Oct 25 2026

Cigs will continue to trend to MVFR today around the area. At KRAP and western SD, the downward trend will go to IFR by tonight. Coverage of light rain showers will continue to increase today over South Dakota, especially east of the Black Hills.

IFR to LIFR is likely late tonight into Monday morning for parts of western SD due to low clouds, lower vsbys, and rain mixed with snow in some spots.

The lowered conditions will continue into Monday afternoon with improvement from west to east late Monday into Tuesday morning.

Unr Watches

SD...None. WY...None.

Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Conservative index and reflects what the press published. Terms of use. How to use Weather