2020 Long Range Weather Forecast for San Diego, 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 2020 Old Farmer’s Almanac, available online and in stores.

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

Free 2-Month Weather Forecast

April 2020 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
Apr 1-6Sunny, cool
Apr 7-10Rainy, cool
Apr 11-15Sunny, cool
Apr 16-25Rain, then sunny, cool
Apr 26-30Scattered showers, cool
Apriltemperature 56° (4° below avg.)
precipitation 1.3" (0.5" below avg. north, 1" above south)

May 2020 Long Range Weather Forecast for Pacific Southwest
DatesWeather Conditions
May 1-4Sunny, warm inland; am sprinkles, pm sun coast
May 5-6Sunny; warm coast, hot inland
May 7-12Sunny, hot inland; am sprinkles, cool coast
May 13-23Sunny, turning hot
May 24-31Sunny inland; am sprinkles, pm sun coast; warm
Maytemperature 65.5° (2° above avg.)
precipitation 0.4" (0.1" below avg.)

Annual Weather Summary
November 2019 to October 2020

Winter will be cooler than normal. Rainfall will be below normal in the north and above normal in the south, with below-normal mountain snows. The coolest temperatures will occur in mid- and late December, mid- to late January, early to mid-February, and early and late March. The stormiest periods will be in late November, mid- to late December, and early February; from late February into early March; and in mid- and late March. April and May will be cooler than normal, on average, with rainfall below normal in the north and above normal in the south. Summer will be cooler than normal, with rainfall slightly above normal. The hottest periods will be in mid-July and late August. September and October will be slightly cooler than normal, on average, 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 2019 to October 2020

Temperature and Precipitation Chart, November 2019 to October 2020 for San Diego, CA

Reader Comments

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Winter weather

When will we be getting a substantial amount of rain and snow in lake Arrowhead ca.

Rain in Southern California

Nothing over 1/2" per storm for all of 2019, with only three storms in Southern California.

Weather prediction

Hi. When will there be snow in Big Bear from Nov '18 to Mar '19 (winter)?

snow in Big Bear

Hoping around Halloween we receive our first snowfall. Check out my youtube channel.

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!)

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