2017 Long Range Weather Forecast for Rancho Cucamonga, CA

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Complete 2017 Long Range Weather Forecast for the Pacific Southwest Region, November 2016 to October 2017 includes week-by-week details. Instant access via digital download!

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How to Read Long-Range Weather Forecasts

Long-range predictions 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 2016: temperature 51° (3° below avg.); precipitation 2.5" (0.5" below avg. north, 2" above south); Dec 1-6: Rainy periods, cool; Dec 7-13: Sunny, cool; Dec 14-16: Rainy periods, cool; Dec 17-21: Rain, some heavy; warm, then cool; Dec 22-31: Sunny, cold.

JANUARY 2017: temperature 51° (3° below avg.); precipitation 1" (2" below avg.); Jan 1-12: Sunny, cool; Jan 13-20: Rainy periods, cool; Jan 21-26: Sunny, cool; Jan 27-31: Rainy, mild.

Annual Weather Summary: November 2016 to October 2017

Winter temperatures and rainfall will be below normal, with below-normal mountain snows. The stormiest periods will be in late November, mid-December, and mid-January. The coldest temperatures will be in early and late December and mid- to late January.

April and May will be warmer and slightly rainier than normal.

Summer will be hotter than normal, with above-normal rainfall. The hottest periods will be in early and mid- to late July and mid-August.

September and October will be cooler and rainier than normal.

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 2016 to October 2017

Temperature and Precipitation Graph