By 5:35 a.m. Sunday, May 10, Downtown Los Angeles was socked in under a low marine layer, with temperatures lingering in the low 60s and a sticky dew point near 57°F. Those early clouds are expected to thin late in the morning, setting the stage for a warm, mostly sunny afternoon. Light south-southwest breezes and dry weather should hold through Monday.
Afternoon Warm-Up, Valley Heat
Downtown is forecast to top out near 79°F on Sunday, then tick up to about 83°F on Monday. Away from the immediate coast, highs will push into the 80s and 90s, with a few of the hottest valley spots, including parts of the Antelope Valley, flirting with the 100°F mark. Forecasters with the National Weather Service Los Angeles/Oxnard say the worst of the heat will be inland and urge residents to plan outdoor plans with those hotter afternoon hours in mind.
Morning Marine Layer, Sunny Afternoons
The marine layer is expected to rebuild each night, keeping coastal and nearshore neighborhoods cooler with low clouds and pockets of fog in the morning, followed by sunnier, warmer afternoons. A shift in the upper-level pattern should knock daytime highs down by about 5–10°F on Tuesday as the ridge slides east. This same Mother’s Day warmup was already on our radar earlier in the week when we first flagged the oncoming heat surge.
Boaters And Commuters
Out on the water, elevated seas and gusty winds have created small-craft headaches across portions of the outer coastal waters this weekend. Conditions are expected to gradually ease tonight, but mariners should still pull the latest marine forecast before leaving the dock. Onshore, coastal commuters can bank on slow, gray starts with quicker clearing by midday, while inland routes will warm up fast under afternoon southwest breezes that should stay generally under 10 mph.
Plan Ahead
For anyone spending time outside in hotter inland areas, it is smart to tackle strenuous activity early in the day, drink plenty of water, and grab shade during peak afternoon heat. Keep an eye on local alerts and updates from the National Weather Service for any changes to heat advisories or marine conditions.
