2018 Long Range Weather Forecast for San Jose, CA


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How to Read Long Range Weather Forecasts

Our long-range forecasts show weather trends in temperatures and precipitation. For example, will the winter be colder or warmer than average? Will there be more or less snow than what's typical for your area? Our famous predictions (traditionally 80% accurate) are made 18 months in advance, and meant to help you make more informed decisions for long-term planning.

Here on Almanac.com, we provide free long-range forecasts for the next 30 to 60 days covering U.S. and Canadian regions. Find all 12 months of predictions in the annual Old Farmer's Almanac.

Free 2-Month Weather Forecast

DECEMBER 2017: temperature 55° (3° above avg. north, 1° below south); precipitation 1" (1" below avg.); Dec 1-8: Rain, then sunny, cold; Dec 9-20: Rainy periods, mild north; sunny, warm south; Dec 21-26: Sunny, cool; Dec 27-31: Showers, cool.

JANUARY 2018: temperature 53° (1° below avg.); precipitation 4" (3" above avg. north, 1" below south); Jan 1-7: Rain north, some heavy; showers, warm south; Jan 8-14: Rainy periods, cool; Jan 15-17: Sunny, cool; Jan 18-26: Rainy periods, cool; Jan 27-31: Rain, some heavy; mild.

Annual Weather Summary: November 2017 to October 2018

Winter will be cooler than normal, with rainfall above normal in the north and near normal in the south. The coldest periods will occur from late November into early December and in early February. Mountain snows will be above normal, with the stormiest periods in early to mid-November and early and late January. April and May will be slightly drier than normal. Temperatures will be below normal near the coast and above normal inland. Summer will be cooler than normal, with near-normal rainfall. The hottest periods will be from late May into early June and in mid-June and mid-July. September and October will have near-normal temperatures, with rainfall above normal in the north and below normal in the south.

Map showing Old Farmer's Almanac long range weather region number 16

About the Pacific Southwest Region

The Pacific Southwest long range weather region includes all or part of the following states: CALIFORNIA (Long Beach, Los Angeles, San Diego, San Francisco, San Jose).

Pacific Southwest Neighboring Regions

Here are the regions that neighbor the Pacific Southwest long range weather region:

Temperature and Precipitation November 2017 to October 2018

Temperature and Precipitation Graph