| NWS Forecast for: Newcastle WY Issued by: National Weather Service Rapid City, SD Last Update: 5:16 pm MDT Oct 6, 2026 |  |
| Tonight: Clear, with a low around 50. North wind 5 to 7 mph becoming calm in the evening. Winds could gust as high as 17 mph. Wednesday: Sunny, with a high near 76. Light and variable wind. Wednesday Night: Mostly clear, with a low around 49. Northeast wind 5 to 7 mph becoming calm after midnight. Thursday: Sunny, with a high near 74. Calm wind becoming southwest around 5 mph. Thursday Night: Mostly clear, with a low around 52. Calm wind becoming east around 5 mph. Friday: Sunny, with a high near 81. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 22 mph. Friday Night: Clear, with a low around 54. Saturday: Sunny, with a high near 80. Saturday Night: A slight chance of rain before midnight. Partly cloudy, with a low around 49. Sunday: A slight chance of rain. Partly sunny, with a high near 62. Sunday Night: Rain likely. Mostly cloudy, with a low around 44. Columbus Day: A chance of rain. Partly sunny, with a high near 54. Monday Night: A chance of rain. Mostly cloudy, with a low around 41. Tuesday: A chance of rain. Mostly sunny, with a high near 52. | |
| Newcastle WY 43.86°N 104.21°W (Elev. 4380 ft) | |
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