2012 Long-Range Weather Forecast for SeaTac, Washington

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(Nov. 2011 - Oct. 2012)

Complete 2012 Long-Range Weather Forecast for the Pacific Northwest Region, November 2011 to October 2012 includes week-by-week details.

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Free 2-Month Weather Forecast

MAY 2012: temperature 56.5° (1.5° above avg.); precipitation 1.5" (0.5" below avg.); May 1-7: Rain, then sunny, cool; May 8-13: Sunny, warm; May 14-20: Showers, then sunny, cool; May 21-26: Rainy periods, cool; May 27-31: Sunny, warm.

JUNE 2012: temperature 63.5° (2° above avg. north, 5° above south); precipitation 1.5" (avg.); Jun 1-12: Sunny; cool, then very warm; Jun 13-18: Rain, then sunny, warm; Jun 19-27: Showers, then sunny, turning hot; Jun 28-30: Sprinkles, then sunny, cool.

Annual Weather Summary: November 2011 to October 2012

Winter temperatures will be above normal, on average, especially in the south. Precipitation will be above normal in the north and below in the south, with below-normal snowfall. The coldest and snowiest periods will occur in late December, early to mid-February, and early March.

April and May will be cooler and drier than normal.

Summer will be much warmer and slightly drier than normal. The hottest periods will occur in early and late July and early and mid-August.

September and October will be warmer than normal, with above-normal rainfall in Washington and Oregon and near-normal rainfall in California.

Temperature and Precipitation November 2011 to October 2012

See Long-Range Weather Forecasts for major cities in Washington.