| NWS Forecast for: Sumas WA Issued by: National Weather Service Seattle, WA Last Update: 2:25 pm PDT Jul 13, 2025 | |
| This Afternoon: Sunny, with a high near 85. Southwest wind 10 to 13 mph. Tonight: Partly cloudy, with a low around 63. Southwest wind 9 to 11 mph. Monday: Mostly cloudy, then gradually becoming sunny, with a high near 78. South southwest wind around 9 mph. Monday Night: Mostly clear, with a low around 59. West wind around 6 mph becoming calm. Tuesday: Sunny, with a high near 91. Northeast wind 6 to 10 mph becoming north northwest in the afternoon. Tuesday Night: Clear, with a low around 61. Wednesday: Sunny, with a high near 89. Wednesday Night: Mostly clear, with a low around 61. Thursday: Sunny, with a high near 87. Thursday Night: Mostly clear, with a low around 61. Friday: Sunny, with a high near 83. Friday Night: Partly cloudy, with a low around 59. Saturday: Mostly sunny, with a high near 76. | |
| Sumas WA 49°N 122.27°W (Elev. 49 ft) | |
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