2018 Long Range Weather Forecast for Pacific Southwest


Search for Other Locations

Enter a 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. 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

Leave a Comment

Almanac has been trusted for years

I imagine climate change has made weather much more difficult to predict these days. It doesn’t make sense for the Almanac to deliberately make errors in their predictions. I live in So Cal and while it would be helpful
to have local information I can turn on the 11:00p news for that; and even Dallas Raines is off once in awhile. The Farmers Almanac has a rich history in America. Keep up the meaningful work. It’s appreciated.

Socal weather

The main reason it's impossible to predict weather in socal is because wait for it
Because most of socal is located in a basin. It has mountains to the north east and south those mountains cause high pressure to form and stay and as long as the presure is high water producing clouds will have a hard time moving in over land.

So Cal rain forecast - SO WRONG

This site is often way off for rain forecasts for So Cal because it lumps Los Angeles and other areas south of Santa Barbara together with areas as far north as San Francisco - a distance of hundreds of miles - and as we know, up north is WAY wetter than we are, and consistently so. It looks like you can just plug in your zip code and get a more accurate forecast, but it really doesn't seem to work that way. I really wish they separated the north and south more accurately. Obviously they are WAY OFF once again!!


The fact is Southern California feels Doomed to NO RAIN

So wrong

Is it winter or summer? Nearly 90° in JANUARY?!?! We havent gotten a winter at all!!

Rain forecast for January

Wrong wrong wrong!!! No rain I'm sight as a matter of fact heat heat heat!!! Please don't forecast rain for Southern California that's a joke.


I'm not entirely sure it is their fault that it's not raining. Perhaps a local news stations website would be a better choice for up to the minute forecasts. I just use farmers for trying to narrow down planting times for the garden and other seasonal planning. I've always found them to be reliable in general. But long range weather forecasts are difficult at best as their are many unknown variables to account for. I would suggest wunderground.com for local up to date weather.