Best Time for Outdoor Projects in South Carolina

South Carolina weather and outdoor projects

South Carolina has hot, humid summers and mild winters. Columbia in the Midlands is one of the hottest cities in the Southeast in summer, while Charleston on the coast is humid, rainy in summer and exposed to hurricanes.

Fall and spring are the best seasons for staining, painting and sealing. Summer afternoons often bring storms, and nights stay humid, so start early and finish by mid-afternoon. Freezes happen a few times most winters inland but are less common on the coast. Pollen in spring can stick to wet finishes.

Frost dates in South Carolina

In Columbia, the median last spring freeze (32°F) is around March 25 and the median first fall freeze is around November 7, a frost-free season of about 229 days.

In Charleston, the median last spring freeze (32°F) is around March 7 and the median first fall freeze is around November 27, a frost-free season of about 266 days.

How South Carolina compares with other states

Columbia has the 7th-most days at 90°F or hotter of the 50 state main stations (81 a year). Columbia is tied for the 13th-fewest freezing nights of the 50 state main stations (47 a year). Columbia is tied for the 14th-shortest deck staining season of the 50 state main stations (4 good months).

Best time to stain a deck in South Carolina

In Columbia, the most reliable months are April–May and September–October. March, June, August and November can also work on the right days. In December–February, nights average about 36°F, too cold for the coating to dry and cure overnight. July is hot, with average highs near 93°F and about 24 days a month at 90°F or more, so work early in the day. In March and November, nights average about 43°F, so finish early on mild days and check the overnight low. June and August are hot, with highs near 90°F, so start early and keep out of full afternoon sun.

In Charleston, the most reliable months are April–May and September–October. June–August and November–March can also work on the right days. January is cool, with highs around 60°F, so choose the warmest afternoons. In February–March and November–December, nights average about 44°F, so finish early on mild days and check the overnight low. June–August is hot, with highs near 90°F, so start early and keep out of full afternoon sun.

Deck staining forecast →

Best time to paint outside in South Carolina

In Columbia, the most reliable months are April–May and September–October. June, August and November–March can also work on the right days. July is hot, with average highs near 93°F and about 24 days a month at 90°F or more, so work early in the day. January is cool, with highs around 57°F, so choose the warmest afternoons. In February–March and November–December, nights average about 40°F, so finish early on mild days and check the overnight low. June and August are hot, with highs near 90°F, so start early and keep out of full afternoon sun.

In Charleston, the most reliable months are March–May and September–November. June–August and December–February can also work on the right days. In December–February, nights average about 41°F, so finish early on mild days and check the overnight low. June–August is hot, with highs near 90°F, so start early and keep out of full afternoon sun.

Exterior painting forecast →

Best time to pour concrete in South Carolina

In Columbia, the most reliable months are April–October. March and November can also work on the right days (average highs Mar 68°F, Nov 66°F). December–February averages about 12 nights a month at or below 32°F, so fresh concrete needs blankets or heated enclosures. March and November bring about 5 freezing nights a month, so pick a mild spell and keep curing blankets on hand.

In Charleston, the most reliable months are April–November. February–March and December can also work on the right days (average highs Feb 64°F, Mar 70°F, Dec 63°F). January averages about 9 nights a month at or below 32°F, so fresh concrete needs blankets or heated enclosures. February–March and December bring about 4 freezing nights a month, so pick a mild spell and keep curing blankets on hand.

Concrete pouring forecast →

Best time to seal a driveway in South Carolina

In Columbia, the most reliable months are May–October. March–April can also work on the right days (average highs Mar 68°F, Apr 77°F). December–January is too cold, with average highs around 58°F. In February and November, nights average about 39°F, too cold for the coating to dry and cure overnight. In March–April, nights average about 48°F, so finish early on mild days and check the overnight low.

In Charleston, the most reliable months are April–May and September–October. March, June–August and November can also work on the right days. In December–February, nights average about 41°F, too cold for the coating to dry and cure overnight. In March and November, nights average about 47°F, so finish early on mild days and check the overnight low. June–August averages about 9 wet days a month, so wait for a clear stretch.

Driveway sealing forecast →

Best time to fertilize or treat a lawn in South Carolina

In Columbia, the most reliable months are February–May and September–November. June, August and December–January can also work on the right days. July is hot, with average highs near 93°F and about 24 days a month at 90°F or more, so work early in the day. December–January is cool, with highs around 58°F, so choose the warmest afternoons. June and August are hot, with highs near 90°F, so start early and keep out of full afternoon sun.

In Charleston, the most reliable months are September–May. June–August can also work on the right days (average highs Jun 89°F, Jul 91°F, Aug 90°F). June–August is hot, with highs near 90°F, so start early and keep out of full afternoon sun.

Lawn fertilizer forecast →

How the weather differs across South Carolina

Of the places above, Charleston has the most good months for staining, painting and concrete combined (18 job-months), and Columbia has the fewest (15).

Monthly weather in Columbia

*Days with 0.1 inch of rain or more; column notes.

Monthly weather in Charleston