Hilton Head Island, SC weather in September
Expect warm, oppressively humid weather with frequent rain in Hilton Head Island in September, with highs near 86°F and lows near 70°F. Rain falls on about 10 days.
- Normal high
- 86°F
- Normal low
- 70°F
- Wet days
- 10
- 4.0 in total
- Muggy days
- 24
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 89°F | 82°F |
| Normal low | 73°F | 65°F |
| Chance of a wet day | 38% | 31% |
| Sunrise / sunset | 6:58 am / 7:47 pm | 7:16 am / 7:09 pm |
| Daylight | 12.8 h | 11.9 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 September day
- 6 am71°Fdew point 68°F
- 9 am77°Fdew point 69°F
- Noon83°Fdew point 68°F
- 3 pm84°Fdew point 68°F
- 6 pm80°Fdew point 69°F
- 9 pm75°Fdew point 70°F
NOAA hourly normals (local standard time) from Beaufort MCAS (19 mi away); average wind 6 mph; clear or few clouds in 31% of daytime hours, mostly cloudy or overcast in 46%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F2 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph21 of 30
- Hot dayshigh 90°F or more9 of 30
- Muggy daysdaily mean dew point 65°F or more24 of 30
- Wet daysat least 0.01 in of rain or melted snow10 of 30
- Notable rainat least 0.10 in6 of 30
- Freezing nightslow 32°F or below0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 4.0 in; a dry September brings about 2.8 in and a wet one about 5.4 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202019: average high 91°F
- Coolest September1995: average high 81°F
- Wettest September2007: 7.8 in
- Driest September2005: 0.1 in
- Highest reading98°F (September 14, 1991)
- Lowest reading51°F (September 30, 2001)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 90°F | 86°F | 78°F |
| Normal low | 74°F | 70°F | 59°F |
| Wet days | 13 | 10 | 8 |
| Comfortable days | 0 | 2 | 12 |
| Daylight | 13.3 h | 12.4 h | 11.4 h |
Highs change by -4°F from August and -8°F into October.
Nearby alternatives in September
- Drier: Macon, GA173 mi · high 88°F · 7 wet days
How Hilton Head Island ranks in September
- Normal high132nd warmest of 378 cities; 2nd of 5 in South Carolina
- Wet days317th driest of 378
- Comfortable days272nd most of 342
What to pack for Hilton Head Island in September
- Light, breathable clothing – highs near 86°F and about 24 muggy days
- A rain jacket or umbrella – rain on about 10 days
- A swimsuit – about 21 beach days
Heating and cooling
September has 1 heating degree days and 379 cooling degree days (base 65°F), 9% of the year's total heating and cooling demand.
Questions
How hot is Hilton Head Island in September?
The normal high is 86°F and the normal low is 70°F. From 1991 to 2020 the hottest September reading was 98°F (September 14, 1991).
Does it rain a lot in Hilton Head Island in September?
About 10 days in September have at least 0.01 in of precipitation, and the normal total is 4.0 in. The wettest September in 1991-2020 was in 2007 (7.8 in); the driest was in 2005 (0.2 in).
Is September a good time to visit Hilton Head Island?
September ranks 9th of 12 months on our comfort score for Hilton Head Island (45 out of 100). It has about 2 comfortable days and about 9 days at 90°F or hotter. The best months are March and April.
Where the numbers come from
- Temperature, rain, frost dates, humidity and wind by hour and cloud cover: Beaufort MCAS (USW00093831), 19 mi N of the city center, 37 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Beaufort MCAS (722085-93831), 19 mi N of the city center, 37 ft . Hourly observations, 1991-2020.
- Not available for this location: snowfall and snow depth (no station close enough or similar enough in elevation).