Southern California Wakes to May Gray With Coastal Fog Saturday as Los Angeles Hits 75 to 87 Degrees Inland and Desert Communities Near Palm Springs and Thermal Reach 98 Degrees
LOS ANGELES, California — The classic May gray pattern is firmly in place across Southern California this Saturday morning, with an onshore flow at the surface combining with a healthy marine inversion to produce low clouds and patchy fog along the coast. Once the marine layer burns off, skies turn mostly sunny and hazy with a sharp temperature split between the mild coast and the warm to hot inland and desert communities. Temperatures today range from 67 degrees at Redondo Beach all the way to 98 degrees at Palm Springs, Thermal, and Ocotillo Wells, a spread of more than 30 degrees across a region that can often feel like multiple climate zones existing simultaneously.
Today’s High Temperature Forecast Across Southern California
| City | Region | High Temperature Today |
|---|---|---|
| Redondo Beach | South Bay Coast | 67°F |
| Oxnard | Ventura Coast | 70°F |
| San Clemente | Orange County Coast | 68°F |
| Long Beach | Los Angeles Coast | 73°F |
| Irvine | Orange County | 74°F |
| Anaheim | Orange County | 77°F |
| Downtown Los Angeles | Los Angeles | 75°F |
| Downey | Southeast Los Angeles | 76°F |
| Thousand Oaks | Ventura County | 78°F |
| San Gabriel | San Gabriel Valley | 80°F |
| Woodland Hills | San Fernando Valley | 82°F |
| Ontario | Inland Empire | 84°F |
| Riverside | Inland Empire | 84°F |
| San Bernardino | Inland Empire | 83°F |
| Lake Elsinore | Southwest Riverside County | 86°F |
| Hemet | Inland Empire | 86°F |
| Lancaster | Antelope Valley | 87°F |
| Victorville | High Desert | 85°F |
| Hesperia | High Desert | 81°F |
| Temecula | Southwest Riverside County | 79°F |
| San Diego | San Diego Coast | 74°F |
| El Cajon | San Diego Inland | 79°F |
| Escondido | San Diego Inland | 77 to 78°F |
| Borrego Springs | San Diego Desert | 96°F |
| Palm Springs | Coachella Valley | 98°F |
| Thermal | Coachella Valley | 98°F |
| Ocotillo Wells | Anza-Borrego Desert | 98°F |
| El Centro | Imperial Valley | 98°F |
| Joshua Tree National Park | High Desert | 84°F |
| Yucca Valley | High Desert | 83°F |
| Big Bear Lake | San Bernardino Mountains | 67°F |
What the May Gray Pattern Means and Why It Happens Every Year
May gray is one of the most recognizable seasonal weather patterns in Southern California, and it surprises visitors who expect wall-to-wall sunshine every day of the year.
| Feature | What Causes It |
|---|---|
| Marine inversion | A layer of warm air sits above cool marine air near the surface, trapping low clouds and fog against the coastline |
| Onshore flow | Wind blowing from the Pacific Ocean toward land pushes cool, moist air inland during the morning hours |
| Morning fog and low clouds | The trapped marine air creates a gray overcast that can extend several miles inland before burning off |
| Afternoon clearing | As the sun heats the ground, the marine layer lifts and thins, allowing sunshine to break through by midday or early afternoon |
| Why it is called May gray | The pattern is most persistent in May before transitioning to the slightly different June gloom pattern in the following month |
The marine inversion is strongest in the early morning, which is why coastal residents wake to gray skies and patchy fog while inland communities see sun earlier in the day. By afternoon the coast typically clears to hazy sunshine while inland valleys and desert communities have been sunny since morning.
🌡️ The 30-Degree Temperature Split Across One Region
The gap between 67 degrees at Redondo Beach and 98 degrees at Palm Springs on the same day is one of the most dramatic features of Southern California’s climate geography and it plays out regularly during the May gray season.
| Zone | Temperature Range | Driver |
|---|---|---|
| Beach communities | 67 to 73°F | Marine layer keeps temperatures suppressed, direct ocean influence |
| Los Angeles Basin | 74 to 78°F | Some marine influence but urban heat and distance from coast adds warmth |
| San Fernando and San Gabriel Valleys | 78 to 87°F | Blocked from direct marine flow by mountains, heating up more freely |
| Inland Empire | 83 to 86°F | Further from coast, trapped heat in valleys |
| High Desert — Lancaster, Victorville | 85 to 87°F | Elevation moderates extreme heat but distance from coast eliminates marine cooling |
| Low Desert — Palm Springs, Thermal, El Centro | 96 to 98°F | Extreme solar heating with no marine influence, below sea level in some areas |
The desert communities sitting at 98 degrees today are running several degrees above normal for early May, consistent with the inland temperature anomaly noted in the forecast discussion.
What Southern California Residents Should Know for Saturday
- Beach and coastal communities from Redondo Beach through San Diego face a typical May gray morning with fog burning off by late morning. Temperatures in the upper 60s to low 70s make for comfortable conditions once the clouds lift but bring a jacket for the morning hours.
- Los Angeles Basin and valley residents can expect a mostly sunny and hazy afternoon with temperatures in the mid to upper 70s. The haziness is typical for May when the marine layer and onshore flow trap particulates close to the surface.
- Inland Empire residents from Ontario through Riverside and Lake Elsinore face warm afternoon conditions in the low to mid 80s. These temperatures are above normal for early May and warrant staying hydrated during any extended outdoor activity.
- Desert communities near Palm Springs, Thermal, and El Centro are heading into a legitimately hot day at 96 to 98 degrees. Heat precautions apply at these temperatures, including limiting outdoor activity during peak afternoon hours, staying hydrated, and never leaving people or pets in parked vehicles.
- Lancaster and the Antelope Valley reach 87 degrees today, which is the warmest point in the Los Angeles County inland zone. Afternoon outdoor activities should account for full sun exposure with no marine cooling at this distance from the coast.
WaldronNews.com will continue tracking Southern California weather patterns and provide updates on marine layer timing, inland heat development, and any pattern changes heading into next week.