2020 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

September 2020 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Sep 1-3Showers, cool
Sep 4-8Sunny inland; am sprinkles, pm sun coast; cool
Sep 9-15Sunny; hot inland, cool coast
Sep 16-18Sunny, hot
Sep 19-27Sunny, warm
Sep 28-30Showers, cool
Septembertemperature 71° (1° above avg.)
precipitation 0.2" (avg.)

October 2020 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Oct 1-4Rainy periods, cool
Oct 5-12Sunny, turning warm
Oct 13-17Showers, then sunny, cool
Oct 18-23Rainy periods, cool
Oct 24-31Sunny, cool
Octobertemperature 63° (2° below avg.)
precipitation 0.8" (1" above avg. north, 0.5" below south)

Annual Weather Summary
November 2019 to October 2020

Winter will be cooler than normal. Rainfall will be below normal in the north and above normal in the south, with below-normal mountain snows. The coolest temperatures will occur in mid- and late December, mid- to late January, early to mid-February, and early and late March. The stormiest periods will be in late November, mid- to late December, and early February; from late February into early March; and in mid- and late March. April and May will be cooler than normal, on average, with rainfall below normal in the north and above normal in the south. Summer will be cooler than normal, with rainfall slightly above normal. The hottest periods will be in mid-July and late August. September and October will be slightly cooler than normal, on average, 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 2019 to October 2020

Temperature and Precipitation Chart, November 2019 to October 2020 for Pacific Southwest Region

Reader Comments

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Weather Reports!!

I COMPLETELY AGREE! Can you name another science that is studied and be so wrong most of the time?! We haven’t gotten any better determining weather than 50 yrs ago‼️
The joke my friends & family often say is YOU HAVE A BETTER CHANCE OF ACCURACY PREDICTING THE WEATHER BY GOING OUTSIDE THAN READING OR LISTENING TO REPORTS!

Yes, I Can!

Psychology.

Predicting the weather

The weather like economics has so many variables it is impossible to predict exactly. If you could predict what the wind is going to do it would be easier. Why does the wind change directions? Why does the wind speed up and then slow down? Why does a front blow in from the north then change direction to go eastward? Until you can answer these questions and many more, you will have to settle with what we have, which in my opinion is not that bad.

Another science that's usually wrong

Economics. Because the three principle theories all try to take people out of the equation. But people always mess things up.

So Cal n Water?

Southern Cali is/ WAS desert long before man migrated into the area. It should be treated as such and plant logical to it's more natural arid climate. REAL Nor Cal is where the water is most abundant and the river systems were forged with mountain run offs. The Sacramento Valley should be the most logical farming area and water accordingly

weather or not

The Editors's picture

If it were in our power, we would give everybody the weather they want—and need (ok, 80% of it). As you may know, 1) the borders of/shapes of the weather regions are based on the climatological movement of weather systems [in very simple terms, how the wind blows]; 2) we make forecasts well in advance (this winter’s last winter), and 3) there are factors beyond our control or foresight or change over the months since the forecasts are made [ocean temps and jet streams probably lead the list].

We appreciate that you have faith in or mere curiosity about our weather forecasts, whatever the weather. Thanks for taking the time to come to this page and share your thoughts.

News Flash for SoCal - you’re NOT the only area on the map!!

Yet again SoCal thinks they ARE the only region in California included in the Farmers Almanac weather guide for Pacific Southwest Region. You might just get crazy and look at the entire region included in the Pacific Southwest map before you toss out your criticism. Farmers is generally accurate within a week or so - close enough to plan your garden planting. I know this because it has been my weather guide in superior California (meaning far northern Sacramento Valley - you know it’s where you get your WATER!!) for many, many years. Cut these guys some slack and acknowledge that geographically SoCal is just a fraction of this very important farming region. You probably need to stick with the Weather Channel.

Psychological Reasons for SoCal Negative Comments

I think a lot of these comments aren't really from frustration with the Farmer's Almanac, but with global warming and what it's doing to Southern California. The fact is, we're concerned, deeply concerned, when we don't see rain in January and February, and by extension, an end to global warming in our lifetimes. It leaves one, who lives in California, with a feeling of doom. Wishing for it to get better does not solve the problem. Governments, including our federal one, have to start taking this "new normal," as officials are calling it more often, much more seriously, and so do we, the average citizens. It's no longer a liberal left issue; the reality is here.

your predictions are ridiculously wrong

There will be no rain in California through most of February, yet you predict a lot of rain. What is your excuse for being absolutely wrong on a regular basis?

accuracy

The Editors's picture

We do not calculate our accuracy until at least the end of a season (not weekly, not monthly). And this season (winter) is not over yet. Traditionally our predictions are 80 percent accurate; sometimes more, sometimes less. If the ocean temps, jet stream/s, oscillations, and other factors would conform to our expectations, we—and every other weather prognosticator—would be 100 percent accurate all the time.

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