Los Angeles Weather Month By Month: What Actually Happens Here
LA doesn't have one climate. It has about eight depending on where you are and whether the wind is blowing from the ocean or the desert. The average annual temperature sits around 64°F, but that number is basically useless if you're trying to plan anything beyond a vague outfit decision. I learned this the hard way after showing up to a shoot in the San Fernando Valley in October with light jackets for everyone, only to watch the temperature climb past 90°F by noon while the coastal strip stayed at a crisp 62°F. The lesson wasn't dramatic. Just keep two thermometers in your pocket. Let's break this down month by month, but first a note on why most weather summaries for Los Angeles fail people. They pull data from LAX or Downtown LA and apply it everywhere. That's how you end up unprepared. Mountain passes, the basin floor, the coast, the high desert — each operates on its own timeline. The monthly averages below are anchored to the metro basin, which is where most people actually live and spend time. January is the wettest month on average, pulling in roughly 4.8 inches of precipitation across the basin. But "wettest" is a relative term. You can go the entire month with zero rain days if the atmospheric river skirts north through the Central Valley. I've seen it happen. Conversely, I've also watched three days of storms dump more water than some years get in the Mojave. The variability is the feature here.
Temperatures hover in the 50s to low 60s during the day and drop into the 40s at night. The real killer isn't the cold, it's the damp. A 48°F morning in the basin feels significantly worse than a 48°F morning anywhere else because the air holds moisture that seeps through layers. Wear something with a wind-resistant outer shell. Cotton is a mistake this time of year unless you're prepared to be cold for hours. February follows a nearly identical pattern with slightly more daylight. Average highs reach 65°F and lows sit near 50°F. Rain probability ticks up marginally. This is also shark month in a meteorological sense — Pacific storm systems intensify as the ocean surface temperature gradients shift, and the biggest rainfall events of the year tend to land between mid-February and early March. If you're building outdoors, schedule your concrete pours for late February through March when the ground begins drying out. March is the transition month. Rainfall drops to about 2.2 inches on average, and daytime temperatures climb into the upper 60s. The Santa Ana winds start making their first appearances, usually as brief dry gusts that push humidity below 20%. I've had to pause photography work multiple times in March because the wind kicked up dust from the Sylmar area so thick that visibility dropped below half a mile within twenty minutes. Check the National Weather Service wind advisory page before heading into the hills.
April Through June: The Dry Stretch Before The Heat
April averages around 1.1 inches of rain, and May brings roughly 0.4 inches. These are the driest months outside of summer, and the landscape turns brown faster than most newcomers expect. The chaparral fires start smoldering in the canyons by late April, and fire weather restrictions go into effect across Los Angeles County. Don't dispose of cigarette butts or use propane grills in open areas during this window. The penalties are steep and the risk is real. Temperatures in April reach the mid-60s to low 70s during the day. May pushes into the low to mid-70s, and this is where the marine layer becomes your daily reality. The fog rolls in off the Pacific every morning, usually burning off between 10:00 AM and noon if you're near the coast. In the eastern basin and the Valley, that fog can linger until 1:00 PM or later. I've missed morning meetings because I underestimated how long the overcast would hold in Burbank. Set your expectations for delayed sunlight, not guaranteed sunshine. June marks the shift. Daytime temperatures climb into the low to mid-70s along the coast and push into the upper 70s and low 80s in the interior valleys. The marine layer thins out. Humidity drops into the 40% range during the day. This is the most pleasant weather window in Los Angeles, and it's also the busiest tourist season. If you're trying to park anywhere near Santa Monica or the Pier, arrive before 9:00 AM or accept that you'll be walking from three blocks away.
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July Through September: Gray July, Hot August, Burnin' September
July is famous for a reason. The coast stays stubbornly cool, often in the 60s, while the interior explodes past 90°F. This temperature differential drives the marine layer back in most mornings, creating what locals call "May Gray" extending well into July. The term makes it sound permanent, but the fog pattern is fragile. One afternoon with offshore flow and it all clears in two hours. I tracked this for a client project in 2019 and mapped seventeen separate fog dissipation events between June 15 and July 31 along the Pacific Coast Highway corridor. The variation is enormous. August is the hottest month. Average highs reach 84°F at LAX but routinely exceed 95°F in the Valley and Inland Empire. I've worked outdoor events in West Covina in August where the heat index pushed past 100°F by 3:00 PM. The workaround I use now is simple: no outdoor work after 2:00 PM from mid-July through September. Period. There are exceptions, obviously, but the statistical probability of a dangerous heat event jumps significantly after that cutoff. September is strangely deceptive. It's the second driest month with almost no rain, and temperatures stay warm into the upper 70s along the coast. But this is also when the Santa Ana events peak. These are dry, hot downslope winds that can push temperatures into the 80s and 90s in the basin while simultaneously dropping humidity to single digits. The fire danger becomes extreme. In 2020, I watched a Santa Ana event in late September that pushed air quality into the "hazardous" range across the entire metro area. The smog wasn't even local — it was wildfire smoke from camps burns mixed with the dry wind. Check AirNow.gov before making any plans that involve prolonged outdoor exposure.
October Through December: The Second Spring That Isn't Really Spring
October is arguably the best month weather-wise in Los Angeles. Rainfall averages just 0.5 inches. Daytime temperatures sit in the low 70s along the coast and mid-70s inland. The Santa Ana winds still appear, but less frequently than in September. This is prime outdoor event season, and the light quality in the late afternoon is genuinely excellent for anything involving cameras or visuals. The sun sits lower in the sky, producing longer shadows and warmer color temperatures between 4:00 PM and sunset. November brings the first real chance of significant rainfall, averaging around 1.5 inches. Temperatures drop into the mid-60s during the day and the 40s at night. The ocean is at its warmest this time of year, usually sitting around 66-68°F off the coast, which makes for decent swimming if you don't mind the cold air making the transition jarring. I still swim in November most years, and I've never gotten sick from it, but your mileage will vary if you're not acclimated. December is cool and potentially wet. Average rainfall climbs to about 3.2 inches, and highs sit in the low 60s. Snow is virtually nonexistent in the basin but regularly accumulates above 6,000 feet in the nearby San Gabriel Mountains. I've driven through the Palisades area in December and seen freezing rain on the roads while standing at sea level it was a perfect 62°F. The elevation change of six thousand feet in twelve miles creates microclimates that GPS weather apps consistently miss. Download a dedicated mountain weather app if you're heading into the high country.
What Nobody Tells You About LA Weather
The first thing is the wind. Most weather guides for Los Angeles don't emphasize how much wind matters here. The Santa Anas aren't a seasonal curiosity, they're a defining climate feature that affects everything from fire risk to air quality to how your HVAC system performs. During a strong Santa Ana event, indoor temperatures can rise 10-15°F without any cooling system intervention because the wind pressure pushes hot air into buildings and forces it through gaps and vents. I've had to reschedule equipment installs because the ambient heat inside an unventilated warehouse hit 95°F on a day that the forecast called for 72°F. The second thing is the inversion layer. Between November and February, a thermal inversion frequently traps pollution and moisture near the ground. The result is a persistent low-hanging haze that reduces visibility and makes the air feel heavier than the temperature suggests. This is why winter mornings in the basin often look like they're photographed through a tinted window. It's not your imagination. The inversion can persist for days at a time, and it's nearly impossible to break without a frontal system moving through. Altitude is the third factor that ruins most weather plans. Los Angeles spans from sea level to over 10,000 feet within a two-hour drive. Mount Wilson sits at 5,710 feet and routinely runs 15-20°F cooler than downtown on the same afternoon. Big Bear is another 3,000 feet higher and operates on an entirely different weather clock. If your itinerary involves multiple locations at different elevations, assume each one needs its own weather check. The standard LA forecast won't help you prepare for a mountain drive.
Practical Takeaways
Layer everything. Always. The temperature swing between morning and afternoon can exceed 25°F year-round in most parts of the basin. A light jacket in the morning becomes unnecessary by noon, and essential again by 7:00 PM in the winter months. Check hyperlocal forecasts. The National Weather Service station for the LA basin covers a massive area, and the forecasts are reliable at the regional level but imprecise at the neighborhood level. For actual daily planning, the Foothills Weather app and the Local 4U radar provide more granular data than the standard app forecasts most people rely on. Respect the dry season. From May through October, the combination of low humidity, occasional Santa Ana winds, and accumulated drought conditions on vegetation creates a fire environment that changes rapidly. I've watched a dry canyon go from walkable to closed in under an hour during a Santa Ana event in October. When red flag warnings are issued, treat them as operational constraints, not suggestions.
The monsoon influence arrives in August and September sometimes. It's subtle compared to the Southwest, but moisture from the Gulf of California can push humidity above 60% and produce brief, intense downpours that the rest of the year never sees. These events are unpredictable and short-lived, usually lasting twenty to forty minutes, but they can dump an inch or more of rain in that window. Flash flooding is the primary risk, and the washes and dry creek beds in the hills become dangerous within minutes of a storm passing overhead.
