Every August the phone starts ringing with people who want the house painted before the holidays. It is the hottest stretch of the year in the Valley, the stucco on a west wall is too hot to hold a hand against by two in the afternoon, and everyone wants to start Monday. I understand the instinct. I also know that the best window of the whole year opens in about four weeks, and that a job started in the right month lasts longer than one started in the wrong one.
Southern California gives painters more workable days than almost anywhere in the country. That is a gift, and it is also the reason people assume the calendar does not matter. It does. Paint cures by chemistry, chemistry cares about temperature and moisture, and our weather swings harder between coast and Valley, and between noon and midnight, than the mild reputation suggests.
Paint cares about the wall, not the forecast
Most exterior paints want the air and the surface between roughly 50 and 90 degrees, at least five degrees above the dew point, and they want those conditions to hold for about forty-eight hours after the last coat. The number that trips people up is the surface. A forecast of 82 and sunny sounds perfect. A stucco wall facing west in that sun in August is far hotter than the air, hot enough that acrylic paint dries on contact before it can flow out and level. You get lap marks, a thin brittle film, and a coat that bonded to the surface for about a third of the time it needed.
The other end matters too. When Valley nights drop into the forties in December and January, water-based paint applied that afternoon never fully forms a film. The next morning you see brown streaks running down the wall, which is the paint’s own surfactants leaching out, and the finish underneath is weaker than it looks. Mild by Chicago standards is still cold by paint standards.
The forecast says 82 and sunny. The stucco on your west wall says something much hotter, and the paint only hears the wall.
The Southern California calendar
I plan a year of exterior work around four stretches, and each one has its own trap.
- September through November is the window. Warm days, dry air, nights still above 50, marine layer gone from the coast. Paint levels, cures, and bonds the way the can promises. The two things I watch: a September heat wave, which can push Woodland Hills past 100 for a few days, and the first Santa Ana winds in October, which blow dust into wet paint and dry it too fast. Both are forecastable a few days out, and both are worth waiting out.
- December through February is interior season. Our rain, what we get of it, falls in these months. Days are short, and Valley nights are cold. Exteriors are still possible in a dry stretch with a low-temperature paint and a clean three-day forecast, but this is when I book interiors, cabinets, and commercial work. A house painted in a February window between storms is a gamble on the third day.
- March through May is the second window. Rain tapers off in March and the temperatures are close to ideal. The catch is the marine layer. From May into June the coast wakes up under a gray lid that keeps north walls damp until late morning, and in Malibu, Santa Monica, and the Palisades I do not start a stucco wall until it has been in the sun long enough to dry through, not just on top. The Valley clears earlier and is less of a problem.
- June through August is workable, with discipline. The coast is fine most of the summer. The Valley, Pasadena, and the hills are not fine in the afternoon. On those jobs we start early, paint the east walls first, follow the shade around the house, and leave the west wall for the last hour of the day or the next morning. It is more days of work, and it should be, because the alternative is a finish that flashed dry on the hottest wall of the house.
Coast versus Valley
The cities I work in run from Malibu to Pasadena, and on the same day in the same month those two can be twenty-five degrees apart. That changes the plan more than the month does. A Santa Monica exterior in July is a pleasant job. The same house in Calabasas is a dawn start and an afternoon spent on the shaded side. A Brentwood or Beverly Hills house sits in between and usually has the easiest year of all.
On the coast I worry about moisture: dew on a north wall, salt air on the trim, a marine layer that soaks the surface before the sun arrives. Inland I worry about heat and wind: surface temperature on stucco, dust in the paint when the Santa Anas come down through the passes. Neither one is a reason not to paint. Both are reasons to schedule the walls, not just the week.
How I schedule an exterior
If you want the job to last, this is how I would book it, and it is how I book my own.
- Book fall early. The September-to-November window fills by late summer. If you call in August you will usually get a spot; if you call in October you may be looking at spring.
- Wash first, then wait. The house gets pressure-washed at the start of the job and then dries for a couple of days before any paint goes on. After rain, add more. Stucco holds water deep inside, and painting over a wall that is dry on the surface only is how blistering starts.
- Check three days out, not one. The forecast that matters is the one for the forty-eight hours after the last coat. Rain, a cold night, or a wind event in that window is a reason to hold, even if the painting day itself looks perfect.
- Follow the sun around the house. East walls in the morning, north and south through the middle of the day, west last or the next morning. On a hot week this is the whole difference between a coat that levels and one that flashes.
- Finish before the dew. The last coat of the day goes on early enough to skin over before evening moisture settles on it. On the coast that can mean stopping at three in the afternoon.
- Put interiors in winter. If you have both on your list, the exterior goes in the fall or spring window and the interior goes in the rainy months. You get the best conditions for each and a painter who is glad to see you in January.
If you have to paint in summer
Sometimes the timing is not yours to choose. The house is going on the market, the HOA sent a letter, the old paint is failing and a winter of rain will make it worse. Summer work is fine if the painter respects the wall: early starts, shade-chasing, a paint rated for the heat, and an honest extra day or two in the schedule. What you want to avoid is the crew that shows up at ten, sprays the west wall at two, and packs up at four. That is the exterior I get called to look at in three years, and by then the only fix is to do it again.
If you are thinking about the exterior this year, call me now and let’s put you in the fall. It is the best month of painting weather we get, and I would rather do your house once, in the right conditions, than twice.
Paul Zappala
Founder, PZ Painting