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.

Free 2-Month Weather Forecast

October 2018 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Oct 1-5Rain then sunny, cool
Oct 6-13Sunny, turning warm
Oct 14-18Rain, then sunny, cool
Oct 19-24Sunny, turning warm
Oct 25-28Sunny, cool
Oct 29-31Rain north; sunny, cool south
Octobertemperature 66° (1° above avg.)
precipitation 1.5" (2" above avg. north, 0.5" below south)

November 2018 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Nov 1-6Rainy north, sunny south; cool
Nov 7-8Sunny, cool
Nov 9-17Rainy periods, cool
Nov 18-21Showers, cool
Nov 22-24Rain, heavy north
Nov 25-30Sunny, cool
Novembertemperature 57° (1° below avg.)
precipitation 4.5" (3" above avg.)

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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This summer

What are we looking at for late July to early August? Do you anticipate very hot temps in San Jose (90s or higher) or will it be more reasonable - or can we just not predict that very accurately yet?

Late July to early August in SJ

Hot. It's always hot that time of year in San Jose. Weird. It's always foggy here in SF because it's so hot in the South bay and the hot air hits the cold, damp air off the ocean here in SF and Voila! Fog!!

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!)

every day changing weather systems

I am extremely interested in how Escondido,ca can have ever changing temperatures especially in the up coming summer i would be interested to see how cold it is in summer nights in the island part of San Diego.

Weather Report

Thank you guys for excellent weather predictions for the Corona, and surrounding areas. We love your long and short term weather reports.

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.

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