Verdict: Fair month
Charleston Weather in August
August runs warm in Charleston, with daily highs around 30°C (86°F) and nights near 24°C (75°F). It's also the wet side of the calendar: rain falls on about 20 days, so build flexibility into plans. August is workable in Charleston if your dates are fixed — just plan around the conditions.
Average high
30°C / 86°F
Average low
24°C / 75°F
Rain days
~20
Precipitation
205 mm
What to pack for Charleston in August
- Light, breathable clothing — linen and technical fabrics earn their keep
- High-SPF sunscreen, sunglasses, and a refillable water bottle
- Rain gear is non-negotiable — expect rain on roughly 20 days
- Comfortable walking shoes — every guide on this site assumes you'll use them
August against the rest of the year
Warmest in Charleston: Jul (31°C / 88°F) · Coolest: Jan (15°C / 59°F) · Wettest: Aug (~20 rain days)
15°
7°
Jan
17°
9°
Feb
20°
12°
Mar
23°
15°
Apr
26°
19°
May
29°
23°
Jun
31°
25°
Jul
30°
24°
Aug
28°
21°
Sep
24°
17°
Oct
20°
12°
Nov
16°
8°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)