2021 Long Range Weather Forecast for San Diego, CA

Get the Long Range Weather for Your Location

See long range weather forecasts for the next 60 days from The Old Farmer’s Almanac! Our long range forecasts can be used to make more informed decisions about future plans that depend on the weather, from vacations and weddings to sporting events and outdoor activities.

To see long term forecasts for the entire year, pick up a copy of The 2021 Old Farmer’s Almanac, available online and in stores.

Note: Long range forecasts are regional, not city-specific.

Free 2-Month Weather Forecast

August 2021 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Aug 1-3Sunny, cool
Aug 4-12A few showers; cold inland, warm coast
Aug 13-20Isolated showers; cool inland, warm coast
Aug 21-26Sunny, warm
Aug 27-31Scattered showers; cool north, warm south
Augusttemperature 70° (1° below avg.)
precipitation 0.35" (0.5" above avg. north, avg. south)

September 2021 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Sep 1-4Showers, turning cooler
Sep 5-16Sunny, cool
Sep 17-25Rainy periods, cool north; sunny, warm south
Sep 26-30Sunny, warm
Septembertemperature 70° (avg.)
precipitation 1.2" (1" above avg.)

Annual Weather Summary
November 2020 to October 2021

Winter will be cooler and drier than normal, with below-normal mountain snows. The coldest temperatures will occur in late December, late January, and mid- to late February. The stormiest periods will be from late January into early February, mid- to late February, and late March into early April. April and May will be cooler than normal, with rainfall below normal in the north and above normal in the south. Summer temperatures will be cooler than normal inland and warmer near the coast, with slightly above-normal rainfall. The hottest periods will be in mid-June and mid- to late August. September and October will be warmer 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 2020 to October 2021

Temperature and Precipitation Chart, November 2020 to October 2021 for San Diego, CA