The best time of year to paint outside in the Upstate

Paint doesn’t care what month it is. It cares about temperature, moisture, and what lands on it while it’s still wet. Over a year in the Upstate we get a little of everything: a yellow spring, a hot and sticky summer, a good fall, and a winter that’s mild most afternoons but cold most nights.

Here’s how each season plays out on the outside of a house, and how we plan around it.

What exterior paint needs to cure right

Exterior latex paint feels dry to the touch in an hour or two, but it keeps curing for days after that. Most weather problems happen in the first several hours, before the film has set up.

Three things matter most:

• Temperature. Every can lists a minimum application temperature on the label. It usually applies to the air, the surface and the paint itself. Many newer exterior paints are made to go on in cooler weather than older ones did, but the number differs from product to product. Go by the label or the product data sheet, not a rule of thumb.
• Moisture. Rain, dew or fog on paint that hasn’t set up can leave streaks and spots. The surface also has to be dry when paint goes on, which matters after a pressure wash.
• What’s in the air. Pollen, dust, leaves and bugs stick to wet paint. A clean wall that stays clean for the first few hours gets the best finish.

Spring: good temperatures, a lot of pollen

Anyone who has lived here a spring knows the yellow-green dust that covers cars, porches and patio furniture. That’s pine pollen, and Clemson Extension puts the heavy stretch at late March through April.

Pollen won’t ruin a paint job by itself. The trouble is that it settles on a freshly washed wall and sticks to wet paint. If we wash a house on Monday and the pollen comes down Monday night, we’d be painting over a dusty film on Tuesday, and paint holds best to a clean surface.

So during peak pollen weeks we:

• Wash right before painting, not days ahead.
• Run a hand across the siding before we spray or roll. If it comes back yellow, we rinse again.
• Keep an eye on windy days, which move the most pollen, and work the sheltered sides first.

Once the pollen tapers off, late April and May can be a very good time to paint. Days are warm, nights are getting milder, and summer humidity hasn’t settled in yet. Spring showers come and go, so we plan each side around the forecast.

If you’re painting to sell in spring, see getting your house ready to sell. The wash right before paint matters more than the exact date.

Summer: heat, humidity and afternoon storms

Upstate summers are hot and humid, and late afternoon thunderstorms are part of the normal pattern. The National Weather Service office in Greer describes thunderstorms as common across the area, especially from late spring through mid-summer.

Summer painting works fine with planning. The problems are specific.

Direct sun on hot siding

Paint that goes onto a wall baking in full sun dries too fast. You get lap marks where the roller overlaps paint that has already started to set, and the paint doesn’t level out the way it should. We follow the shade around the house: the west side in the morning, the east side in the afternoon.

The afternoon storm

A pop-up storm on paint that went on an hour earlier can leave runs and streaks. We start early, check the radar through the day, and stop on a side when a storm is building instead of racing it.

Humidity slows drying

Sticky air keeps paint soft longer. It still cures, but it stays open to rain and evening dew for more of the day.

Plenty of houses get painted in June and July. It just takes earlier starts and a little give in the schedule.

Dew and cool nights: the problem most people miss

On clear nights siding cools off fast and dew forms on it, sometimes before the sun is fully down. If that happens on paint that went on late in the afternoon, the moisture can pull some of the soap-like ingredients in latex paint up to the surface. Sherwin-Williams calls this surfactant leaching. It shows up as tan or brown streaks, sticky spots or shiny patches, usually on the shady sides.

It’s mostly cosmetic. Sherwin-Williams says it often rinses off with water or washes away with normal weather, but stubborn cases can need repainting. Better to avoid it:

• Stop painting early enough that the paint has a few hours to set before the evening cools down.
• Start on the morning sides only after the dew has burned off and the surface is dry.
• In spring and fall, when days are warm and nights are cool, shorten the painting day on the shady sides.

Fall: usually the best window

If we had to pick one season, it’s fall. From mid-September into early November the Upstate often gets runs of mild days and cool, dry mornings after a cold front passes. The pollen is long gone and the summer storm pattern has calmed down. Paint goes on easily and dries at a good pace.

Fall still has a few catches:

• Shorter days. As the season goes on, the window between “the dew is off the wall” and “it’s getting too cold to finish” gets smaller.
• Leaves. Fresh paint grabs leaves, and gutters full of leaves can overflow onto new trim. We clear the roofline and check the gutters before we start.
• Everyone wants fall. It fills up first. If you want the house done before the holidays, call in late summer.

Winter: possible, with limits

Upstate winters are mild compared to most of the country, but nights below freezing are normal. Local forecasters say most of the Upstate usually sees its first freeze in early November, and freezing nights stay common through the winter.

The Sherwin-Williams exterior paints we use are made to go on in cooler weather than paint used to. Even so, the number on the label isn’t the whole story:

• The temperature has to stay above the label minimum while the paint dries, not only when it goes on. A 50 degree afternoon followed by a hard freeze that night is a problem.
• Drying and recoat times get much longer in the cold, so a two-coat job takes more days.
• Short days mean the dew stays on the wall later in the morning and comes back earlier in the evening.

So a winter exterior job is a forecast call. We look for a stretch of mild days with nights that stay above the paint’s limit, start late, stop early, and save the shady north side for the warmest part of the day. Smaller jobs like a front door, shutters or a garage door fit nicely into a mild winter week. See doors and garage doors. If the weather won’t cooperate, we’ll tell you and wait rather than paint in the wrong conditions.

Winter is also a good time to get interior painting done while the outside waits.

The year at a glance

Season	What’s good	What to watch
Spring (March to May)	Mild temperatures, longer days	Pine pollen in late March and April, spring showers
Summer (June to August)	Long days, dry stretches	Full sun on hot siding, afternoon storms, humidity
Fall (September to November)	Mild days, cool dry mornings, no pollen	Shorter days, dew, leaves, a full schedule
Winter (December to February)	Open schedule, no pollen	Freezing nights, slow drying, short days

How to plan your project

• Want fall? Call in summer. Estimates are free, and we can set a date while the good weeks are still open.
• Expect a weather day or two. Rain happens in every season here. Moving a day is better than painting into a storm or a heavy dew.
• The material doesn’t change the calendar much. Wood, vinyl, brick and fiber cement all follow the same weather rules. Vinyl has its own color rules, covered in our guide to painting brick or vinyl siding.
• Prep is part of the timing. Our exterior prices include a pressure wash and two coats, and the wash gets scheduled to land right before paint. See how we price for what goes into an exterior price.

Whether you’re in Greer, Simpsonville or anywhere in between, the same calendar applies. For how we prep, which paint level fits your house, and what goes into the price, see our exterior painting page. To get on the schedule for a good window, call or text 864-800-8275.