National Weather Service Forecast for: Gillette WY
Issued by: National Weather Service Rapid City, SD
Updated: 12:28 am MDT Jun 30, 2026
 
Overnight

Overnight: Mostly clear, with a low around 45. South wind around 6 mph becoming light and variable.
Mostly Clear

 Tuesday

Tuesday: Sunny, with a high near 84. Southwest wind 5 to 8 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph.
Sunny

 Tuesday
Night
Tuesday Night: Increasing clouds, with a low around 51. Northeast wind 5 to 10 mph becoming light north after midnight. Winds could gust as high as 20 mph.
Increasing
Clouds

 Wednesday

Wednesday: Partly sunny, then gradually becoming sunny, with a high near 85. Light and variable wind becoming west around 6 mph in the afternoon. Winds could gust as high as 16 mph.
Becoming
Sunny

 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 55. East wind 5 to 7 mph becoming south after midnight. Winds could gust as high as 15 mph.
Mostly Clear

 Thursday

Thursday: Mostly sunny, with a high near 90. South wind 6 to 10 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.
Mostly Sunny

 Thursday
Night
Thursday Night: Partly cloudy, with a low around 55.
Partly Cloudy

 Friday

Friday: A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 91.
Mostly Sunny
then Slight
Chance
T-storms
 Friday
Night
Friday Night: A chance of showers and thunderstorms before midnight, then a slight chance of showers. Partly cloudy, with a low around 54.
Chance
T-storms then
Slight Chance
Showers
Lo 45 °F Hi 84 °F Lo 51 °F Hi 85 °F Lo 55 °F Hi 90 °F Lo 55 °F Hi 91 °F Lo 54 °F

 

Overnight
 
 Mostly clear, with a low around 45. South wind around 6 mph becoming light and variable.
Tuesday
 
 Sunny, with a high near 84. Southwest wind 5 to 8 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph.
Tuesday Night
 
 Increasing clouds, with a low around 51. Northeast wind 5 to 10 mph becoming light north after midnight. Winds could gust as high as 20 mph.
Wednesday
 
 Partly sunny, then gradually becoming sunny, with a high near 85. Light and variable wind becoming west around 6 mph in the afternoon. Winds could gust as high as 16 mph.
Wednesday Night
 
 Mostly clear, with a low around 55. East wind 5 to 7 mph becoming south after midnight. Winds could gust as high as 15 mph.
Thursday
 
 Mostly sunny, with a high near 90. South wind 6 to 10 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.
Thursday Night
 
 Partly cloudy, with a low around 55.
Friday
 
 A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 91.
Friday Night
 
 A chance of showers and thunderstorms before midnight, then a slight chance of showers. Partly cloudy, with a low around 54.
Independence Day
 
 A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 84.
Saturday Night
 
 Mostly clear, with a low around 54.
Sunday
 
 Sunny, with a high near 91.
Sunday Night
 
 Mostly clear, with a low around 61.
Monday
 
 Sunny, with a high near 94.

 

Forecast from NOAA-NWS for Gillette WY.