Harbor Island, South Carolina Weather
Cicadas claim the scorching afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Harbor Island weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Partly Cloudy26%—89°80°—
- MondayJul 6Overcast14%—91°80°+2°
- TuesdayJul 7Light Drizzle32%—95°76°+4°
- WednesdayJul 8Heavy Drizzle32%0.06″94°77°-1°
- ThursdayJul 9Overcast14%—98°77°+4°
- FridayJul 10Overcast16%—95°79°-3°
- SaturdayJul 11Partly Cloudy34%—95°80°0°
AQI 33 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 41 now. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 10 around 1 PM.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 4 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 41 now. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 10 around 1 PM.
- Present
- AQI 41
- UV peak
- 0.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 10
PM × Wind × Precip
PM2.5 at 5.4 µg/m³ (AQI 30) with a 0.79 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.79
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:34 PM
- Moonset
- 11:34 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Harbor Island at a glance
- Today vs. normal: 80°F — typical for the season
- Last frost: March 1 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
15-Day Forecast — Harbor Island
- Sun89°80°26%
- Mon91°80°14%
- Tue95°76°32%
- Wed94°77°32%
- Thu98°77°14%
- Fri95°79°16%
- Sat95°80°34%
- Sun95°77°39%
- Mon84°75°38%
- Tue90°70°28%
- Wed89°74°23%
- Thu91°73°41%
- Fri87°73°42%
- Sat87°75°55%
- Sun90°75°39%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Harbor Island
SPC includes Harbor Island in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Harbor Island
- 29920