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Gillette, Wyoming 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Gillette WY
National Weather Service Forecast for: Gillette WY
Issued by: National Weather Service Rapid City, SD
Updated: 11:29 am MDT Jul 8, 2025
 
This
Afternoon
This Afternoon: Sunny, with a high near 91. Calm wind becoming north around 5 mph.
Sunny

Tonight

Tonight: Mostly clear, with a low around 61. North wind 5 to 10 mph becoming south after midnight. Winds could gust as high as 20 mph.
Mostly Clear

Wednesday

Wednesday: Sunny, with a high near 95. South wind around 5 mph becoming northeast in the afternoon. Winds could gust as high as 15 mph.
Sunny

Wednesday
Night
Wednesday Night: Mostly cloudy, with a low around 60. East wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 15 mph.
Mostly Cloudy

Thursday

Thursday: Partly sunny, with a high near 84. Northwest wind 10 to 15 mph becoming north in the afternoon. Winds could gust as high as 25 mph.
Partly Sunny

Thursday
Night
Thursday Night: A 50 percent chance of showers and thunderstorms.  Increasing clouds, with a low around 52. North wind around 15 mph, with gusts as high as 25 mph.
Chance
T-storms then
Chance
Showers
Friday

Friday: A 40 percent chance of showers and thunderstorms.  Partly sunny, with a high near 66. North wind around 15 mph, with gusts as high as 25 mph.
Chance
Showers then
Chance
T-storms
Friday
Night
Friday Night: Mostly clear, with a low around 48. North wind 5 to 10 mph becoming southwest after midnight. Winds could gust as high as 20 mph.
Mostly Clear

Saturday

Saturday: Mostly sunny, with a high near 81.
Mostly Sunny

Hi 91 °F Lo 61 °F Hi 95 °F Lo 60 °F Hi 84 °F Lo 52 °F Hi 66 °F Lo 48 °F Hi 81 °F

 

This Afternoon
 
Sunny, with a high near 91. Calm wind becoming north around 5 mph.
Tonight
 
Mostly clear, with a low around 61. North wind 5 to 10 mph becoming south after midnight. Winds could gust as high as 20 mph.
Wednesday
 
Sunny, with a high near 95. South wind around 5 mph becoming northeast in the afternoon. Winds could gust as high as 15 mph.
Wednesday Night
 
Mostly cloudy, with a low around 60. East wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 15 mph.
Thursday
 
Partly sunny, with a high near 84. Northwest wind 10 to 15 mph becoming north in the afternoon. Winds could gust as high as 25 mph.
Thursday Night
 
A 50 percent chance of showers and thunderstorms. Increasing clouds, with a low around 52. North wind around 15 mph, with gusts as high as 25 mph.
Friday
 
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 66. North wind around 15 mph, with gusts as high as 25 mph.
Friday Night
 
Mostly clear, with a low around 48. North wind 5 to 10 mph becoming southwest after midnight. Winds could gust as high as 20 mph.
Saturday
 
Mostly sunny, with a high near 81.
Saturday Night
 
Partly cloudy, with a low around 55.
Sunday
 
Sunny, with a high near 87.
Sunday Night
 
Mostly clear, with a low around 58.
Monday
 
Sunny, with a high near 87.

 

Forecast from NOAA-NWS for Gillette WY.

Weather Forecast Discussion
102
FXUS63 KUNR 081703
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1103 AM MDT Tue Jul 8 2025

.KEY MESSAGES...

- Much warmer today with the possibility of a few storms over the
  Black Hills.

- Hotter on Wednesday with chances for storms (some potentially
  strong to severe) in the afternoon.

- Chances for storms continue Thursday and Friday

&&

.DISCUSSION...(Today Through Monday)
Issued at 310 AM MDT Tue Jul 8 2025

Current water vapor imagery and regional radar imagery shows an
MCS across IA/NE as the upper level shortwave moves off to the
east. Sfc high pressure is moving into the region as upper level
ridging builds over the western US. This is resulting in a dry and
mostly clear night for the CWA. Forecast soundings point at the
potential for some patchy fog to develop over southern SD this
morning, though confidence in coverage too low to put it in the
grids.

Upper ridge continues to build over the western US today as low
level thermal ridge builds into the Northern Plains. This will
support warmer conditions for Tuesday as highs climb into the
upper 80s to low 90s. Continued southerly flow and moisture
transport will lead to development of theta-e ridge over western
SD into northeastern WY. HREF grand ensemble paints 70-90+% probs
of 1000+J/kg CAPE along a corridor stretching from far
northeastern Crook County into the Black Hills and southwestern
SD. Height rises may limit convection across most of the region,
however terrain influenced convergence may be enough for a couple
of storms to develop over the Black Hills. Effective shear of
20-30kt may support organized convection with a marginal threat
for 1+" hail and strong winds. The ridge stays in place for
Wednesday with hotter conditions (highs in some spots could reach
the triple digits). Strong diurnal heating and sfc dewpoints in
the 50s to 60s will support moderate instability with areas on the
western SD plains seeing SBCAPE values of 1500+J/kg. A few subtle
disturbances riding the ridge may be enough to trigger at least
isolated convection across the western SD plains. Bulk shear will
be similar to Tuesday`s, which could support organized convection
and a marginal severe threat.

Potent lead shortwave and attendant cool front approaches the
region Thursday morning which could bring another round of storms
to the area. Marginal deep-layer shear and questions on timing of
the shortwave as well as how unstable the airmass will keep
confidence low for now. Trough will move through late Thursday
into Friday with increasing shear but greatly decreased CAPE.
Therefore, not anticipating much severe risk Thursday night into
Friday. CAA associated with an attendant cold front and pressure
rises behind said front may promote a breezy and mild Friday.

&&

.AVIATION...(For the 18Z TAFS Through 18Z Wednesday)
Issued At 1102 AM MDT Tue Jul 8 2025

VFR conditions are expected through the TAF period. A storm or
two is possible over the Black Hills this afternoon.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...None.
WY...None.
&&

$$

DISCUSSION/KEY MESSAGES...Wong
AVIATION...Smith
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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