SDtoday City Guide Live Banner

Summer 2023 weather trends for San Diego

Prepare for summer in San Diego with these seasonal temperature and precipitation outlooks.

SD summer weather 2023

Long, warm summer days are on the horizon.

Photo via Monica Garske + SDtoday

Table of Contents

We know the question on your mind — when will it get hot? Thanks to the National Oceanic and Atmospheric Administration’s (NOAA) Climate Prediction Center, we know what temperatures and precipitation trends to expect in our city for July, August, and September. While exact weather conditions typically can’t be predicted more than a week in advance, here’s a seasonal outlook to help you prepare for the summer.

Reminder: The first day of summer is Wednesday, June 21.

SD summer weather outlook 2023

The summer 2023 temps will be warmer than normal in San Diego County.

Map via National Weather Service Climate Prediction Center

🌡️ Temperature

Think hot. San Diego County has a 33-50% chance of temperatures leaning above normal — on par with national trends.

🌨️ Precipitation

Although 2023 has been quite rainy locally, NOAA predicts SD will experience ordinary rainfall amounts for summer — so, not much.

☀️ Drought

NOAA predicts drought conditions will be kept at bay. January-May 2023 made for the ninth wettest year to date in San Diego County over the past 129 years — with nearly 8 inches of rainfall above normal.

SD Summer 2023 weather trends

Here’s to a nice, beachy summer in SD.

Photo via Monica Garske + SDtoday

Joyous July

Typically, July in SD is warm, with the average high at 75.4°. Grab your shades: July and August are the sunniest months — averaging 11.9 hours of sunshine daily — and also bring the highest UV index of 6. Pro tips: wear sunscreen and sun-protective clothing.

Awesome August

August is just beachy. It’s the warmest month of the year in San Diego — averaging a high of 77.4° — and the month with the warmest ocean water, nearly 68°. The average length of the day (sunrise to sunset) is 13 hours and 19 minutes, plenty of time for family fun.

Sizzlin’ September

Summer runs through Friday, Sept. 22. This month’s temps are still hot, averaging a high of 76.6° — and it feels a lot like August. The sun shines for an average of 10.3 hours daily, and average humidity hovers around 68%.

Looking further ahead: Weather experts say El Niño has arrived earlier than expected, so it’ll likely grow stronger through the 2023-2024 fall and winter.

SDtoday Phone
Good news for San Diego.
Get the best local news & events sent to your inbox each morning, for free.