2020 Long Range Weather Forecast for San Luis Obispo, 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 2020 Old Farmer’s Almanac, available online and in stores.

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

Free 2-Month Weather Forecast

July 2020 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Jul 1-14Sunny inland; am sprinkles, pm sun coast; warm, then cool
Jul 15-20Sunny, turning hot
Jul 21-23Sunny inland; am clouds, pm sun coast; cool
Jul 24-31Sunny, warm
Julytemperature 71° (avg.)
precipitation 0" (avg.)

August 2020 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Aug 1-8Sunny, seasonable
Aug 9-11Scattered showers north, sunny south; cool
Aug 12-16Sunny, warm
Aug 17-25Sunny inland; am clouds, pm sun coast; cool
Aug 26-31Sunny, warm
Augusttemperature 69° (2° below avg.)
precipitation 0.2" (0.2" above avg. north, avg. 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 San Luis Obispo, CA

Reader Comments

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Why are you so mad about this small thing?

Bay Area rains

The Editors's picture

Sometimes we wish we were wrong, too. Hope you get some relief, Sarah. Thanks for letting us know you care so much!

If you dont like the rain

Then move!! To someplace hot


People can't always pick up and move. A little grumbling and ventilating relieves stress. People have done this since there have been people

Pretty much useless

They keep updating their forecasts after the event has happened! Bogus models and antiquated and dated approach. Sorry. Get in with the times


The Editors's picture

We do not change our long-range forecasts after they have been published. Our forecasts are created up to 18 months in advance based on a number of factors, including solar activity, historical and forecasted weather patterns, and atmospheric conditions. As climate science has evolved, so have our forecasting methods, though we still rely on the basic theory that our founder used 228 years ago.

If you are looking for the latest, up-to-the-minute weather info, then I’m afraid our forecasts won’t be of much help. However, if you want to get a general idea of what weather to expect five months from now, our forecasts are the ones to use—and with an overall average accuracy of 80%, we still have faith in our methodology!

Yosemite waterfalls in September

Any idea if there will still be water flowing in the waterfalls in Sept. 2019, based on the current snow pack and rainfall? My husband and I are planning to visit the Valley from Sept. 1 or 2 to the 7th. When I went in August 2014, the waterfalls were all dry. :-( What's your best guesstimate as to this year? Thank you!


the Best time to see the Falls is May to June... I would go in May... the will be flowing well after that is get less very quickly. there is a website for Yosemite that will have more information and lots of pictures... Don't forget to see the Giant Sequoias, They are in the same area just a short distance away. Also in Kings Canyon Nation Park.. Grant Grove. Enjoy...

Weather, climate, change/no change man made or not

I read lots of stuff from all sorts of sources, from "shlock" to peer reviewed journals, and while I think this came out about a year ago in "Nature", I am not positive as I tossed the magazine before I copied the article; but the article stated that at least five planets are warming - Mercury, Venus, Earth, Mars and Jupiter. Because the first two are sunward of us and solar winds blow out from the sun past them to Earth, etc., I think that is pretty good proof that, while we are not the best stewards of the planet, and can/must do better, we are not the primary cause of global warming. By the way the easiest way to cool the planet (which as an asthmatic, who loves warm weather I do not want) is just to pollute the air more, see studies on temperature drops after major volcanic eruptions. The most easily researched is the early 19th century "Year without a Summer", following the relatively small eruption of an Italian volcano. We are also in a dither about carbon dioxide, which people and animals exhale, we just need to plant more greenery as plants take in CO2 and release oxygen. Also, despite the rantings about methane levels it appears from the most recent studies that that is a result of warming, not a cause, and methane deteriorates rapidly, anyway. By the way, when did cows become the bad guys, I have found most of them to be very sweet.

I think it should not be raining so much for so long for four mo

I think it should not be raining for so many days. It is getting very tiring for people in Modesto California....