2018 Long Range Weather Forecast for San Jose, 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

June 2018 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Jun 1-2Sunny, hot
Jun 3-11Sunny, cool inland; am sprinkles, pm sun coast
Jun 12-14Sunny, hot
Jun 15-17Sprinkles, cool
Jun 18-22Sunny; hot inland, cool coast
Jun 23-30Sunny, cool
Junetemperature 69° (1° above avg.)
precipitation 0.1" (avg.)

July 2018 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Jul 1-9Sunny, seasonable
Jul 10-17Sunny, turning cool inland; am clouds and sprinkles, pm sun coast
Jul 18-19Sunny, hot
Jul 20-31Sunny, warm
Julytemperature 70° (1° below avg.)
precipitation 0" (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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Really?

“Stormiest periods in early and late January”? Right. It’s like 65 and sunny. No rain in sight. It’s not just a problem with forecasts in So Cal, I’m in Redwood City, 20 miles south of San Francisco and north of San Jose.

SO WRONG - AGAIN

Why can't this site do a better job of predicting for SOUTHERN California? They always seem to lump us together with No Cal making our forecasts in the southland so wrong! LA, OC, San Diego, Riverside, etc. are all way far south of San Francisco, San Jose, etc. yet they keep forecasting us as one region, even though it's hundreds of miles and a very different climate...obviously.

California forecasts

As you probably know, a key driver of Southern Cal weather is the Pacific Ocean: The water temp (El Niño, La Niña, and their cousin Neutral) and other currents, as well as the jet stream conspire to change conditions dramatically and quickly. We distinguish portions of the region (north and south, and near the coast vs inland) to indicate differences in the forecast. So you know, each region’s shape, or area, is based on the climatological movement of weather systems (that is, wind and other patterns). Similar weather can occur in your region’s disparate areas. (Consider this: Readers on the East Coast often wonder when Richmond, Virginia, and Boston, Massachusetts, are in the same region; it’s because in a similar way, weather—storms, often—travels up the coast affecting all areas between the two cities.)
 

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!!

Rain???

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.

Hehe

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.

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