| NWS Forecast for: Newcastle WA Issued by: National Weather Service Seattle, WA Last Update: 11:25 pm PDT Jun 17, 2026 |  |
| Overnight: Clear, with a low around 54. Light northeast wind. Thursday: Sunny, with a high near 78. North northwest wind 5 to 8 mph. Thursday Night: Partly cloudy, with a low around 57. North northeast wind 3 to 8 mph. Juneteenth: Mostly sunny, with a high near 83. Calm wind becoming north northwest around 5 mph in the afternoon. Friday Night: Mostly clear, with a low around 56. Light and variable wind becoming south southwest 5 to 8 mph in the evening. Saturday: Mostly sunny, with a high near 76. Saturday Night: Clear, with a low around 54. Sunday: Sunny, with a high near 81. Sunday Night: Mostly clear, with a low around 58. Monday: Sunny, with a high near 88. Monday Night: Mostly clear, with a low around 62. Tuesday: Sunny, with a high near 89. Tuesday Night: Mostly clear, with a low around 61. Wednesday: Mostly sunny, with a high near 83. | |
| Newcastle WA 47.54°N 122.17°W (Elev. 397 ft) | |
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