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Roof Coating Weather in South Carolina: Best Months by City

Roof Coating season in South Carolina, city by city: peak months, season boundaries, and annual workable-day counts from NOAA 1991–2020 normals. Charleston leads with 264 workable days a year; Columbia runs the shortest at 154.

South Carolina is not one climate: Charleston banks 264 workable roof coating days a year while Columbia gets 154 — a spread the table below itemizes month by month. Season boundaries mark the first and last month averaging 8+ workable days against the label rules (50–90°F, nights 40°F+).

Statewide, October is the strongest month — it tops or ties the table in most listed cities. The live strips on each city page decide the week; this table decides the month. Scoring rules: methodology; the national playbook: the roof coating guide.

Cities in South Carolina

Peak months and season boundaries from NOAA 1991–2020 normals; season = months with at least 8 workable days.
CityPeak monthsSeasonWorkable days/yr
Charleston Oct, Nov, May year-round 264
Columbia Oct, May, Apr March–June 154
Greenville Oct, Sep, May April–November 164
Myrtle Beach Oct, May, Mar February–December 202
Rock Hill Oct, Sep, May March–June 158
Spartanburg Oct, Sep, May March–June 161
Mauldin Oct, Sep, May April–November 164
North Charleston Oct, Nov, Mar February–June 197
Mount Pleasant Oct, Nov, May year-round 264
Florence Oct, Nov, Mar March–June 159

The rules behind these numbers

Typical label thresholds for roof coating — the single ruleset used by every check on this page.
CheckThresholdWhy it matters
Air temperature 50–90°F Acrylic and elastomeric coatings want 50°F+ during application and initial cure.
Overnight low ≥40°F during the first 24 h Water-based coatings can be ruined by a cold, damp night before they skin over.
Dry before ≤0.05" rain in the prior 24 h; watch back to 48 h The membrane must be dry — coatings trap moisture that later blisters.
Dry after <0.05" rain for 24 h after (48 h thick coats want 48 h) Rain inside 24 hours washes uncured coating into gutters.
Evening dew-point spread ≥5°F from 6–11 pm Roofs radiate heat at night and hit the dew point before anything else in the yard.
Daytime humidity ≤85% Humid air slows water-based coatings dramatically.
Wind ≤15 mph (roller only, no spray up to 20 mph) Wind on a roof is a safety limit first and an overspray limit second.

Always follow your product label — formulas vary. The table above is the typical range across major manufacturers, not a promise about your can.

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