2021 Long Range Weather Forecast for Pacific Southwest

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

March 2021 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Mar 1-9Showers, then sunny, turning warm
Mar 10-20Showers, then sunny; cool north, warm south
Mar 21-26A few showers north; sunny, mild south
Mar 27-31Rainy periods, cool
Marchtemperature 57.5° (1° below avg. north, 2° above south)
precipitation 0.5" (2" below avg.)

April 2021 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Apr 1-8Rainy periods, cool
Apr 9-15Scattered showers, cool
Apr 16-24Sunny, turning warm
Apr 25-30Scattered showers, cooler
Apriltemperature 59° (1° below avg.)
precipitation 1.3" (0.5" below avg. north, 1" above south)

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 Pacific Southwest Region

Reader Comments

Leave a Comment

You are wrong

California has four main climate regions and 3 climate zones. The zones are a subtropical climate zone, a hot tropical climate zone which is Southern California, and
the temperate climate zone Which is Northern California. The Climate regions are as follows Northern California, Pacific North West climate, Central Calfornia climate, Southern California climate, Pacific South West Climate. California also has a Mediterranean climate.

Northern & Southern Calif

I totally agree. Our Southern Calif climate is not like that of San Francisco and points farther north. In SoCal, we have a Mediterranean climate, and except for occasional heat during July to Sept, it is very pleasant.

I think your close ...

Southern California does have semi-Mediterranean climate, but in cities that are next to the ocean. Inland temperatures and precipitation typically mirror those of a more arid, desert climate with lower precipitation and colder temperatures in winter and much drier and hotter temperatures in summer. The California area has such varied climates that are not far from one another, it’s interesting to live there, ridiculously expensive yes, but still a great place to live (if you avoid the traffic :) ).

Change your Definition

I'm am right on board with the writer of "CHANGE YOUR DEFINITION OF PACIFIC SW". There are two completely different halves of California climate. Los Banos to North have a wetter climate, cooler temps and plenty of water. From Los Banos South the climate is dry with hotter temps and lack of water.

Riverside County

What kind of weather can the Riverside county expect from October 2019 into January 2020? Last year we had a very nice and unusually chilly Thanksgiving holiday. I was just wondering if we should expect the same this year. Please advise/thank you!!!

Up coming 2019 & 2020 rainfall

Can't you give us an idea of our 2019 & 2020 rainfall for San Francisco Calif.? Just an idea---
Thank You

Rain prediction in San Francisci Ca November 2019

Planning a homeless outreach in San Francisco Ca on September 16, 2019 and would like to know the prediction of rain. Thank you

Winter 2018-2019 rainfall

Winter rainfall for the south turned out to be inaccurate and just the opposite of what you predicted. Rainfall in California was actually ABOVE normal, so much so that it ended the drought all over the state.

Amy you are wrong

The drought actually ended in 2017.

Northern California

Actually the drought ended in March of 2019. I agree that California should be split up into different climates. In Northern California, we have the rains that fill up our lakes and rivers and go through the delta down south. I weather is closer to southern Oregon's weather. If I go by what is listed it is wrong. It didn't predict snowmageddon that dumped so much snow on us after our wildfires left our soil unprotected.

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