Charleston, SC weather in July
Expect hot, oppressively humid weather with frequent rain in Charleston in July, with highs near 88°F and lows near 77°F. Rain falls on about 12 days. It is one of the warmest months in Charleston.
- Normal high
- 88°F
- Normal low
- 77°F
- Wet days
- 12
- 5.1 in total
- Muggy days
- 30
- dew point 65°F+
How July changes from start to finish
| July 1 | July 31 | |
|---|---|---|
| Normal high | 87°F | 88°F |
| Normal low | 76°F | 77°F |
| Chance of a wet day | 36% | 39% |
| Sunrise / sunset | 6:15 am / 8:31 pm | 6:33 am / 8:19 pm |
| Daylight | 14.3 h | 13.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical July day
- 6 am75°Fdew point 73°F
- 9 am83°Fdew point 73°F
- Noon88°Fdew point 73°F
- 3 pm88°Fdew point 73°F
- 6 pm84°Fdew point 73°F
- 9 pm79°Fdew point 74°F
NOAA hourly normals (local standard time) from Charleston Intl Airport (11 mi away); average wind 7 mph; clear or few clouds in 33% of daytime hours, mostly cloudy or overcast in 34%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph20 of 31
- Hot dayshigh 90°F or more9 of 31
- Muggy daysdaily mean dew point 65°F or more30 of 31
- Wet daysat least 0.01 in of rain or melted snow12 of 31
- Notable rainat least 0.10 in8 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per July, counted from daily records for each year 1991-2020.
Rain in July
Normal precipitation is 5.1 in; a dry July brings about 2.8 in and a wet one about 6.9 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 2 an inch or more.
How July varies from year to year
- Warmest July, 1991-20201998: average high 92°F
- Coolest July2013: average high 85°F
- Wettest July2018: 10.9 in
- Driest July1993: 1.3 in
- Highest reading100°F (July 11, 2001)
- Lowest reading65°F (July 31, 1997)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
July compared with June and August
| June | July | August | |
|---|---|---|---|
| Normal high | 84°F | 88°F | 86°F |
| Normal low | 74°F | 77°F | 77°F |
| Wet days | 11 | 12 | 12 |
| Comfortable days | 1 | 0 | 0 |
| Daylight | 14.3 h | 14.1 h | 13.3 h |
Highs change by +4°F from June and -2°F into August.
Nearby alternatives in July
- Warmer: Columbia, SC106 mi · high 96°F · 12 wet days
How Charleston ranks in July
- Normal high183rd warmest of 378 cities; 3rd of 5 in South Carolina
- Wet days300th driest of 378
- Comfortable days304th most of 340
What to pack for Charleston in July
- Light, breathable clothing – highs near 88°F and about 30 muggy days
- A rain jacket or umbrella – rain on about 12 days
- A swimsuit – about 20 beach days
- Sunglasses and sunscreen – about 14.1 hours of daylight and highs near 88°F
Heating and cooling
July has 0 heating degree days and 536 cooling degree days (base 65°F), 13% of the year's total heating and cooling demand.
Questions
How hot is Charleston in July?
The normal high is 88°F and the normal low is 77°F. From 1991 to 2020 the hottest July reading was 100°F (most recently on July 11, 2001).
Does it rain a lot in Charleston in July?
About 12 days in July have at least 0.01 in of precipitation, and the normal total is 5.1 in. The wettest July in 1991-2020 was in 2018 (10.9 in); the driest was in 1993 (1.3 in).
Is July a good time to visit Charleston?
July ranks 11th of 12 months on our comfort score for Charleston (46 out of 100). It has almost no comfortable days and about 9 days at 90°F or hotter. The best month is April.
Where the numbers come from
- Temperature, rain and frost dates: Charleston City (USW00013782), 0.2 mi NNW of the city center, 10 ft . NOAA normals and daily records, 1991-2020.
- Snowfall, snow depth, humidity and wind by hour and cloud cover: Charleston Intl Airport (USW00013880), 11 mi NW of the city center, 40 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Charleston AFB/International Airport (722080-13880), 11 mi NW of the city center, 39 ft . Hourly observations, 1991-2020.