Climate in Johns Island
Johns Island shares the Lowcountry's hot, humid subtropical climate and real regional hurricane exposure, compounded by its own genuinely low-lying geography and documented flooding history.
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Learn moreA hot, humid subtropical climate
Johns Island shares greater Charleston's humid subtropical climate: hot, humid summers (average highs in the upper 80s to low 90s), mild winters (average lows in the mid-50s to low 60s), and roughly 48-55 inches of annual rainfall concentrated April through October, with August typically the wettest month (BestPlaces/regional climate sourcing, retrieved 2026-08-24).
A genuinely low-lying island with real, documented flooding risk beyond named storms
Johns Island is a genuinely low-lying area, and local officials are actively working to prevent flooding as development accelerates. Significant, frequent flooding has affected neighborhoods within an approximately 500-acre drainage basin -- Barberry Woods specifically has seen its single entry road blocked, cutting residents off from emergency services at times (Post and Courier, retrieved 2026-08-24). A real $5.8 million restoration project began construction in 2025 to address this specific problem.
Real regional hurricane exposure, shared across this entire Lowcountry batch
Hurricane Hugo made a direct Category 4 landfall at Isle of Palms in September 1989, a regional benchmark storm shared by every market in this six-market batch. Nearby West Ashley subdivisions saw real flood devastation during Hurricane Irma (2017) -- a cautionary example local Johns Island officials specifically cite when planning current flood mitigation.
Key takeaways
- Johns Island shares the Lowcountry's hot, humid subtropical climate -- not a hurricane-free profile.
- The island is genuinely low-lying with real, documented flooding risk in specific neighborhoods beyond named storms -- Barberry Woods' single-entry-road flooding is a concrete, cited example.
- A real $5.8 million flood-mitigation restoration project began construction in 2025 specifically to address this.
- Regional hurricane exposure (Hugo 1989, Irma 2017's West Ashley flooding) is real and shared across this entire Lowcountry batch.
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