2018-2019 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 annual Old Farmer’s Almanac, available online and in stores.

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

Free 2-Month Weather Forecast

December 2018 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Dec 1-3Sunny; cool north, warm south
Dec 4-10Rainy periods north, sunny south; mild
Dec 11-18A few showers, mild
Dec 19-23Rain north, sprinkles south; mild
Dec 24-31Rain, some heavy; chilly
Decembertemperature 55° (0.5° below avg. coast, 2° above inland)
precipitation 1" (1" below avg.)

January 2019 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Jan 1-3Rainy periods, cool
Jan 4-11Rainy periods north, sunny south; mild
Jan 12-13Showers
Jan 14-23Sunny, cool
Jan 24-31Rain, then sunny, mild
Januarytemperature 54° (avg.)
precipitation 4" (3.5" above avg. north, 1.5" below south)

Annual Weather Summary
November 2018 to October 2019

Winter temperatures will be near or cooler than normal, with rainfall above normal in the north and slightly below normal in the south. The coldest periods will occur in late December, mid-January, and early February. Mountain snows will be near normal, with the stormiest periods in late November, late December, and early January. April and May will be cooler and drier than normal. Summer will be warmer than normal, with near-normal rainfall. The hottest periods will be in mid- to late June, mid-July, and late August. September and October will see temperatures above normal in the northeast and below normal in the southwest. Rainfall will be slightly above 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 2018 to October 2019

Temperature and Precipitation Chart, November 2018 to October 2019 for San Luis Obispo, CA

Reader Comments

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October- my favorite month of

October- my favorite month of the year. ..most likely warm and dry in the day and slightly cooler night, but not cold. Quite possibly Santa Ana winds and brush fires in the foothills.

This October (2018), however, has been incredibly uncharacteristic with two freak rain storms thus far.. no complaints here, though. I love heavy rain and lightening storms!

Weather in Laguna CA - April 6th 2019??

Having a wedding in Laguna Ca April 6th 2019. WEATHER??? Later afternoon into the evening outdoors.


Ya never know, April can be iffy in So Cal, even along the coastline. Though less chance of rain at the beach than if you were to get married further inland, I think.

Please lend your expertise

Can you help predict the weather forecast, especially for precipitation, in California's Capay Valley in late April/May 2019? Another outdoor wedding.

April 6 2019

Having an outdoor wedding April 6th. What is the weather forecast? Please please please tell me dry!

Rainfall in April

Well, the old saying "April showers bring May flowers" is not so true for Northern California. I suggest you check online for the history of April rainfall, specifically in the North Bay but I wouldn't be at all surprised if you learn it's less than an inch. Having said all that if it turns out that 2019 is a rainy year it's pretty much stopped all together by April. Also, we're in the 5th year of a pretty bad drought. Great for outdoor weddings bad for farmers and ranchers. Especially when one considers the fact that California's agriculture feeds one quarter of the world's population!
I think you'll be fine. But in case it does turn out that it's going to rain the slightest amount for a very short time on the most important day of your life make sure you have plenty of tarps, stakes and rope/lines to rig up tents for you guests and food. Congratulations and the best of luck!

Rainfall in April revised response

Oh, for heavens sake LOL, I didn't realize it's in Pasadena! Sorry I went on and on about No Cal. Well, your guess is as good as mine re Pasadena. But I bet if you ask God to not let it rain that day, he'll be cool about it and not let it rain. But in case it does, I stand by my suggestion that you have make sure your wedding planner sets up enough tents. They can actually be very lovely if done right. Best of Luck!

"Please please please tell me dry!"


weather for the mnth. of april 2019

significant rain and or cold?

San Jose CA Long Range Forecast 2018-2019

I firmly believe that from San Jose CA south we will see a drier and warmer than normal Winter/Spring as Fall will be warmer and drier than normal. My theory is if summer has been warm and with the major wildfires CA has had and with predictions of more fires for the Fall the warming from the fires and particles could lead to a higher chance of a drought.

I think that CA from San Jose south may be in for another long stretch of dry weather despite the El Nino forecast. The resilant ridge of High Pressure that was in effect during our last multi-year drought and the lack of sunspots may constitute for the Old Farmers Almanac to rethink their Long Range Forecast.

If we have a lot fo sunspots during an El NIno/La Nina Year think 1998 more flooding will occur due to the Pineapple Express.

Do you predecct above normal percipitation in the form of major Pineapple Expresses with mudslides along Highway 1?

Will San Jose CA be in for a drier than normal winter/spring for 2018-2019?