2018 Long Range Weather Forecast for San Luis Obispo, CA


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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. If your city is located inside a region, the region's forecast will apply to you.

Free 2-Month Weather Forecast

March 2018 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Mar 1-6Rainy periods, cool
Mar 7-11Sprinkles, cool
Mar 12-15Rainy, cool
Mar 16-21Sunny north, rainy periods south; cool
Mar 22-26Showers, cool
Mar 27-31Sunny, warm
Marchtemperature 55° (2° below avg.)
precipitation 2.5" (avg.)

April 2018 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Apr 1-4Sunny, warm
Apr 5-11Scattered showers, cool
Apr 12-21Sunny; warm, then cool
Apr 22-30Scattered showers, cool
Apriltemperature 59° (1° below avg.)
precipitation 0.5" (0.5" below avg.)

Annual Weather Summary: November 2017 to October 2018

Winter will be cooler than normal, with rainfall above normal in the north and near normal in the south. The coldest periods will occur from late November into early December and in early February. Mountain snows will be above normal, with the stormiest periods in early to mid-November and early and late January. April and May will be slightly drier than normal. Temperatures will be below normal near the coast and above normal inland. Summer will be cooler than normal, with near-normal rainfall. The hottest periods will be from late May into early June and in mid-June and mid-July. September and October will have near-normal temperatures, 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 2017 to October 2018

Temperature and Precipitation Graph

Reader Comments

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Cooler than normal?

My son has been in Montana for six years but moved back to NorCal in January. Yesterday he remarked that it seemed a lot colder here than he recalled from growing up here.
Do the stats support this? Is the average temperature here dropping, or is this winter just one of our anomaly years?
Spot on prediction about March, though. It's raining buckets here.

colder than years back

The first question that comes to mind is, how old is your son? because, to a certain extent his interpretation of average temps has to do with when he experienced them—when he grew up. Many people remember weather as being different now from their childhood—and many are correct. But the buzz we hear is that it tends to be warmer …

Averages, or normals, as we explain in the 2018 print Almanac on page 217, are based on 30-year periods. Currently that is 1981 to 2010. The period advances every 10 years. Virtually all meteorological services/orgs in the world subscribe to this calculation. Here is a page where you can look up a few California cities: https://www.currentresults.com/Weather/California/average-annual-city-te...

Here’s one from NOAA with records through the end of last year: https://www.ncdc.noaa.gov/sotc/national/201712

Here’s another page, perhaps more current (you do not say where in NorCal, so not sure if this covers you): https://gacc.nifc.gov/oscc/predictive/outlooks/myfiles/assessment.pdf

Records suggest that the planet has had some of its warmest years in the past 20 years (or less); we seem to see a headline to this effect almost every year! Of course, not every place is warmer, but in terms of averages, California has been in that number.

Make it warmer and a little bit wetter

Tired of flipping off the local TV weather folks when they predict (more and more accurately) cold weather. Even the Weather Channel is getting it right. It used to be that the temp was typically 2-3 degrees warmer than predicted. Now, it's always as cold as predicted, with not enough rain not early enough in our "winter" - which is beginning to earn that label since you guys started this "global warming" thing. We don't miss the seasons enough here to be ok with having to wear long pants and sweaters for months at a time.

So how about it? Y'all have been around since the Post Office. Everyone else is happy with their weather. No one believes in science anymore anyway, so who's going to notice if you do just one little favor for just one little regionette? Something like 8-10 degrees warmer, with about an inch and a half of rain once a month (You can split it up into two days if that's easier) - this is not much to ask, and it would really cheer us up and make our yards and mountains green here at 34/-118. Not to sound crass or anything - because we know a heartfelt thanks is the best reward, but we'll gladly underwrite a substantial subscription contribution if you would kindly honor our request.

the weather you want

If we could give you the weather you want in your regionette, we would happily do it at no charge. In the meantime, we’ll aim for 80% accuracy and see how it goes. (Love your signature name, btw. And if you are, perhaps you have more control over our meteorology than we do!)

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‼️

Yes, I Can!


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.

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

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.