Monthly climate guide
Charleston weather in May
May in Charleston is typically hot, with average daytime highs around 28°C (83°F) and night-time lows near 19°C (65°F). The month usually brings about 96 mm of rain (wet) and is a mix of sun and cloud. Daytime highs are 4°C warmer than April and 3°C cooler than June.
What stands out in May
- In Charleston, May is late spring.
- Skies are at their clearest this time of year.
- Humidity near 75% makes 28°C feel stickier than it sounds.
- Just 140 km apart, but Charleston runs about 4°C warmer than Myrtle Beach this month.
Avg high
28°C
83°F
Avg low
19°C
65°F
Rainfall
96 mm
wet
Humidity
75%
relative
Sky
48%
cloud · a mix of sun and cloud
Charleston weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 14°C / 58°F | 5°C / 40°F | 60 mm | 81% | 69% |
| February | 17°C / 63°F | 7°C / 44°F | 93 mm | 82% | 70% |
| March | 20°C / 68°F | 9°C / 49°F | 81 mm | 78% | 61% |
| April | 24°C / 76°F | 14°C / 57°F | 99 mm | 77% | 50% |
| May | 28°C / 83°F | 19°C / 65°F | 96 mm | 75% | 48% |
| June | 31°C / 88°F | 23°C / 73°F | 140 mm | 76% | 58% |
| July | 33°C / 91°F | 24°C / 76°F | 155 mm | 76% | 56% |
| August | 32°C / 89°F | 24°C / 75°F | 167 mm | 80% | 62% |
| September | 30°C / 85°F | 21°C / 70°F | 129 mm | 80% | 58% |
| October | 26°C / 78°F | 16°C / 60°F | 114 mm | 79% | 49% |
| November | 20°C / 67°F | 9°C / 49°F | 80 mm | 79% | 58% |
| December | 17°C / 63°F | 8°C / 46°F | 99 mm | 84% | 69% |
What to pack for May
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- A compact umbrella or packable rain jacket
- Water-resistant shoes
- Quick-dry fabrics — it feels stickier than the temperature suggests
Is May a good time to visit Charleston?
Compare the months in the chart above to find your ideal window.
Best time to visit Charleston →Other United States cities in May
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Charleston weather in May. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/charleston/may
<a href="https://weathercompare.eu/weather/usa/charleston/may">Charleston weather in May</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/usa/charleston" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Charleston weather in May"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/usa/charleston/may">Charleston weather in May</a> – WeatherCompare</p>
Charleston in May: quick answers
Is May a good time to visit Charleston?
May is one of the wetter months in Charleston, with about 96 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Charleston in May?
Average highs are about 28°C (83°F) and average lows about 19°C (65°F), based on 10 years of daily data.
Does it rain a lot in Charleston in May?
Charleston typically gets around 96 mm of rain in May — wet.
Figures are long-term averages for the area around Charleston (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.