Temperature
Warm by day, mild at night.
84°Ftypical September high
Typical range
September climate
September in Charleston
United States · North America
Warm days and plenty of sun. Hurricane risk near peak is the main drawback.
Some tradeoffs
Some afternoons can feel hot.
Daytime high
84°F
Lows around 69°F
Rain
Several rainy days
Sun
9.5 h/day
Air feel
Humid
Sea temp
83°F
Great for swimming
When to visit
Month-by-month fit
Best
Precipitation
Several rainy days, mostly brief and on-and-off. About 13 wet days, more than in most months.
43%wet-day frequency
AmountWet-day chance
Sunshine
A mix of sunshine and cloud.
9.7 hSeptember sunshine
Heat & humidity by month
Warm days, with humid periods.
69%September Heat feel
Easy airWarm airHot airHumid airVery humid air
Hourly temperature pattern
In September, afternoons feel about 86° and nights feel near 74°.
Very coldColdCoolComfortableWarmHotNight hours
Clear sky
Partly cloudy skies this month.
45%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
6 mphSeptember Calm
Sea temperature
83°FSeptember sea temp
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 83°F, easing to about 77°F in early evening.
Avg temp Typical range
Morning74°F
Feels 78°F
Rain17%
Cloud55%
Humid airHigh
Sun intensityLow
Best windowMidday82°F
Feels 85°F
Rain30%
Cloud57%
Humid airHigh
Sun intensityStrong
Late afternoon83°F
Feels 85°F
Rain30%
Cloud61%
Humid airHigh
Sun intensityModerate
Early evening77°F
Feels 81°F
Rain16%
Cloud56%
Humid airHigh
Sun intensityMinimal
Data tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% | Sea°F |
|---|---|---|---|---|---|---|---|
| Jan | 60 | 40 | 2.7 | 8 | 7.3 | 70 | 71 |
| Feb | 64 | 44 | 3.3 | 8 | 8.0 | 71 | 70 |
| Mar | 69 | 49 | 3.3 | 8 | 9.0 | 68 | 71 |
| Apr | 76 | 56 | 3.2 | 8 | 10.8 | 69 | 73 |
| May | 82 | 65 | 3.4 | 11 | 11.6 | 73 | 77 |
| Jun | 87 | 72 | 5.6 | 16 | 11.4 | 77 | 81 |
| Jul | 89 | 75 | 6.4 | 20 | 11.5 | 80 | 83 |
| Aug | 88 | 74 | 6.8 | 19 | 10.8 | 82 | 84 |
| Sep | 84 | 69 | 5.2 | 13 | 9.7 | 80 | 83 |
| Oct | 77 | 58 | 3.5 | 7 | 8.9 | 77 | 80 |
| Nov | 68 | 48 | 2.4 | 7 | 8.3 | 74 | 76 |
| Dec | 62 | 43 | 3.6 | 8 | 7.2 | 75 | 73 |
Similar climates
Similar
Similar travel styleHong KongChinaSimilar travel styleMiamiUnited StatesSimilar travel stylePalermoItalySimilar travel styleJohns IslandUnited States
Want a side-by-side climate view? Compare Charleston with Hong Kong.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jun 1, 2026
Data & methodology