National Weather Service Forecast for: Gillette WY
Issued by: National Weather Service Rapid City, SD
Updated: 12:31 am MDT Aug 20, 2026
 
Overnight

Overnight: Mostly clear, with a low around 58. Light south wind.
Mostly Clear

 Thursday

Thursday: Sunny, with a high near 91. Calm wind becoming northwest around 5 mph in the afternoon. Winds could gust as high as 18 mph.
Sunny

 Thursday
Night
Thursday Night: Partly cloudy, with a low around 61. North wind around 7 mph becoming south after midnight. Winds could gust as high as 20 mph.
Partly Cloudy

 Friday

Friday: Mostly sunny, with a high near 92. Light and variable wind becoming north 8 to 13 mph in the afternoon. Winds could gust as high as 24 mph.
Mostly Sunny

 Friday
Night
Friday Night: Partly cloudy, with a low around 60. Northeast wind 7 to 13 mph becoming southeast after midnight. Winds could gust as high as 24 mph.
Partly Cloudy

 Saturday

Saturday: Mostly sunny, with a high near 88. Breezy, with a southeast wind 8 to 13 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 31 mph.
Mostly Sunny
then Mostly
Sunny and
Breezy
 Saturday
Night
Saturday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 62. Breezy. Chance of precipitation is 40%.
Breezy.
Chance
Showers then
Mostly Cloudy
 Sunday

Sunday: Mostly sunny, with a high near 91.
Mostly Sunny

 Sunday
Night
Sunday Night: A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 60.
Chance
Showers then
Mostly Clear
Lo 58 °F Hi 91 °F Lo 61 °F Hi 92 °F Lo 60 °F Hi 88 °F Lo 62 °F Hi 91 °F Lo 60 °F

 

Overnight
 
 Mostly clear, with a low around 58. Light south wind.
Thursday
 
 Sunny, with a high near 91. Calm wind becoming northwest around 5 mph in the afternoon. Winds could gust as high as 18 mph.
Thursday Night
 
 Partly cloudy, with a low around 61. North wind around 7 mph becoming south after midnight. Winds could gust as high as 20 mph.
Friday
 
 Mostly sunny, with a high near 92. Light and variable wind becoming north 8 to 13 mph in the afternoon. Winds could gust as high as 24 mph.
Friday Night
 
 Partly cloudy, with a low around 60. Northeast wind 7 to 13 mph becoming southeast after midnight. Winds could gust as high as 24 mph.
Saturday
 
 Mostly sunny, with a high near 88. Breezy, with a southeast wind 8 to 13 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 31 mph.
Saturday Night
 
 A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 62. Breezy. Chance of precipitation is 40%.
Sunday
 
 Mostly sunny, with a high near 91.
Sunday Night
 
 A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 60.
Monday
 
 Sunny, with a high near 86.
Monday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 58.
Tuesday
 
 Mostly sunny, with a high near 85.
Tuesday Night
 
 A slight chance of showers and thunderstorms. Partly cloudy, with a low around 57.
Wednesday
 
 Mostly sunny, with a high near 87.

 

Forecast from NOAA-NWS for Gillette WY.