Temperature
Warm by day, mild at night.
83°Ftypical September high
Typical range
September climate
September in Johns Island
United States · North America
Warm days and some sun. Hurricane risk near peak and humid air are the main drawbacks.
Some tradeoffs
Some afternoons can feel hot.
Daytime high
83°F
Lows around 71°F
Rain
Frequent rain
Sun
10 h/day
Air feel
Humid
Sea temp
83°F
Great for swimming
When to visit
Month-by-month fit
Best
Precipitation
Rain is frequent. About 14 wet days, more than in most months.
47%wet-day frequency
AmountWet-day chance
Sunshine
Plenty of sun this month.
9.8 hSeptember sunshine
Heat & humidity by month
Warm days, with humid periods.
70%September Heat feel
Easy airWarm airHot airHumid airVery humid air
Hourly temperature pattern
In September, afternoons feel about 85° and nights feel near 76°.
Very coldColdCoolComfortableWarmHotNight hours
Clear sky
Partly cloudy skies this month.
45%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
8 mphSeptember Light breeze
Sea temperature
83°FSeptember sea temp
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 82°F, easing to about 77°F in early evening.
Avg temp Typical range
Morning75°F
Feels 78°F
Rain20%
Cloud53%
Humid airHigh
Sun intensityLow
Best windowMidday82°F
Feels 84°F
Rain29%
Cloud56%
Humid airHigh
Sun intensityStrong
Late afternoon82°F
Feels 84°F
Rain29%
Cloud58%
Humid airHigh
Sun intensityModerate
Early evening77°F
Feels 81°F
Rain17%
Cloud56%
Humid airVery high
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 | 59 | 43 | 2.6 | 8 | 7.4 | 72 | 71 |
| Feb | 63 | 46 | 3.2 | 8 | 8.1 | 73 | 70 |
| Mar | 68 | 52 | 3.2 | 8 | 9.1 | 72 | 71 |
| Apr | 74 | 59 | 3.1 | 8 | 10.9 | 73 | 73 |
| May | 80 | 67 | 2.7 | 10 | 11.7 | 76 | 77 |
| Jun | 85 | 74 | 5.0 | 15 | 11.5 | 80 | 81 |
| Jul | 88 | 76 | 5.9 | 19 | 11.6 | 81 | 83 |
| Aug | 87 | 76 | 6.5 | 19 | 10.9 | 83 | 84 |
| Sep | 83 | 71 | 5.1 | 14 | 9.8 | 81 | 83 |
| Oct | 76 | 61 | 3.5 | 7 | 9.0 | 78 | 80 |
| Nov | 68 | 51 | 2.3 | 7 | 8.4 | 76 | 76 |
| Dec | 62 | 46 | 3.5 | 8 | 7.3 | 76 | 73 |
Similar climates
Similar
Similar travel styleCharlestonUnited StatesSimilar travel stylePalma de MallorcaSpainSimilar travel styleLaguna BeachUnited StatesSimilar travel stylePunta de MitaMexico
Want a side-by-side climate view? Compare Johns Island with Charleston.
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