April brings 24°C daytime highs, 18mm of precipitation across about 3 wet days and 12.9 hours of daylight — best for hiking, cycling and reliable sunshine. The strongest run of the year is March to May. July is the quietest month: hot and slow-paced, and still good for beach days, swimming and quiet and local.
Long-run climate normals for Charleston. Month ratings compare months within Charleston only — they are not a ranking of Charleston against other destinations, and they are not a forecast for a specific year.
Last updated: · Live forecast data refreshes hourly.
| Best month | April — Hiking, Cycling, Reliable sunshine |
| Best 3-month window | March–May |
| Quietest month | July — Hot and slow-paced |
| Driest month | April — 18mm |
| Wettest month | August — 111mm |
| Warmest / coolest | July 33°C / January 15°C |
| Seasonality | Strongly seasonal — the months feel like different places |
| Annual rainfall | 699mm over roughly 91 rain days |
July gets roughly 517% more precipitation than April — 111mm against 18mm. That difference, more than temperature, is what changes how a day here feels.
Daytime highs only move 18°C across the whole year (15–33°C), so timing matters far less here than rainfall does.
June gives you 14.2 hours of daylight against just 9.8 in December — a 4-hour difference in how much you can actually fit into a day.
April is the driest month at 18mm across roughly 3 wet days, while August peaks at 111mm.
May is almost as good as April, but usually quieter and cheaper. If your dates are flexible, it is the easier trip.
Charleston changes character completely through the year — April and July are effectively two different destinations. Pick the month that matches what you want to do, not the highest-rated one.
Ratings compare months within Charleston, not against destinations worldwide: five stars means the best time to be here, not that Charleston beats anywhere else. Tags describe what the conditions actually suit.
| Month | Rating | High / Low | Precipitation | Wet days | Sun | Daylight | Best for |
|---|---|---|---|---|---|---|---|
| January | ★★☆☆☆ | 15°C / 5°C | 54mm | 9 | 7h | 10.1h | Hiking · Cycling · Low-angle light |
| February | ★★★☆☆ | 16°C / 6°C | 42mm | 7 | 8h | 10.8h | Hiking · Cycling · Low-angle light |
| March | ★★★★☆ | 20°C / 10°C | 30mm | 5 | 10h | 11.8h | Hiking · Cycling · Reliable sunshine |
| April | ★★★★★ | 24°C / 16°C | 18mm | 3 | 11h | 12.9h | Hiking · Cycling · Reliable sunshine |
| May | ★★★★☆ | 29°C / 21°C | 39mm | 4 | 11h | 13.7h | Beach days · Swimming · Reliable sunshine |
| June | ★★★☆☆ | 32°C / 25°C | 75mm | 8 | 9h | 14.2h | Beach days · Swimming · Reliable sunshine |
| July | ★★☆☆☆ | 33°C / 26°C | 111mm | 12 | 7h | 13.9h | Beach days · Swimming · Quiet and local |
| August | ★★☆☆☆ | 32°C / 25°C | 111mm | 12 | 7h | 13.2h | Beach days · Swimming · Quiet and local |
| September | ★★★☆☆ | 29°C / 21°C | 93mm | 10 | 8h | 12.2h | Beach days · Swimming |
| October | ★★★★☆ | 24°C / 16°C | 42mm | 7 | 9h | 11.1h | Hiking · Cycling · Reliable sunshine |
| November | ★★★★☆ | 20°C / 10°C | 42mm | 7 | 9h | 10.3h | Hiking · Cycling · Reliable sunshine |
| December | ★★★☆☆ | 16°C / 6°C | 42mm | 7 | 8h | 9.8h | Hiking · Cycling · Low-angle light |
| You are planning | Pick | Why |
|---|---|---|
| Sun & beach days | April | 11h daily sunshine, 24°C highs and only 3 rain days. |
| City walking & sightseeing | April | 24°C highs with 12.9h of daylight — long days without heat fatigue. |
| Photography & light | April | 11h of sun and 12.9h daylight give the widest window for golden-hour work. |
| Value & fewer crowds | October | Scores 77/100 — close to peak conditions but outside the busiest window. |
| Cooler-weather travel | February | 16°C highs and 6°C nights suit anyone who dislikes heat. |
Each month in Charleston is described from long-run climate normals and then rated relative to the other eleven months in the same city. A five-star January in a cold destination means January is one of the best times to be there — not that it beats a Mediterranean summer.
| Factor | Weight | What it measures |
|---|---|---|
| Temperature | Described | Average daytime high and overnight low for the month, shown as measured rather than judged. |
| Precipitation | Described | Monthly millimetres and wet-day count, labelled as snow or rain/snow where temperatures make that the likely phase. |
| Sunshine & daylight | Described | Average daily sunshine hours and astronomical daylight length at mid-month, from the city’s latitude. |
| “Best for” tags | Derived | Applied only when the conditions genuinely support the activity — snow depth-friendly cold for skiing, 13–24°C and low rain risk for hiking, dark evenings at high latitude for aurora. A month with few strong use cases gets fewer tags rather than padded ones. |
| Star rating | Relative | Ranks the month against the other eleven months in the same city. Never a comparison between cities. |
Figures are long-run climate averages, not a forecast for a specific year. Where a month lacks sourced rainfall or humidity, the value is modelled from temperature range and rain frequency.
April is the best all-round month in Charleston: 24°C highs, 18mm of precipitation and 12.9 hours of daylight, which suits hiking, cycling and reliable sunshine. The strongest three-month window is March to May.
July — 33°C highs, 111mm of precipitation over roughly 12 days and 13.9 hours of daylight. It is the cheapest and least crowded time to go, and it still works for beach days, swimming and quiet and local.
April is the driest month at 18mm over about 3 rain days, against 111mm in August. Across the year Charleston records around 699mm.
Yes, but the months are genuinely different trips. April suits hiking, cycling and reliable sunshine, while July suits beach days, swimming and quiet and local. Pick the month that matches what you want to do.
Daylight ranges from 9.8 hours in December to 14.2 hours in June, calculated from the city's latitude.