Myrtle Beach, SC weather in September
In September, Myrtle Beach sees highs around 83°F and lows around 65°F: warm and oppressively humid, with some rain. Expect about 9 wet days.
- Normal high
- 83°F
- Normal low
- 65°F
- Wet days
- 9
- 7.0 in total
- Muggy days
- 22
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 86°F | 80°F |
| Normal low | 68°F | 61°F |
| Chance of a wet day | 29% | 28% |
| Sunrise / sunset | 6:49 am / 7:41 pm | 7:09 am / 7:01 pm |
| Daylight | 12.9 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 am67°Fdew point 64°F
- 9 am74°Fdew point 66°F
- Noon81°Fdew point 65°F
- 3 pm83°Fdew point 64°F
- 6 pm79°Fdew point 65°F
- 9 pm72°Fdew point 66°F
NOAA hourly normals (local standard time) from Florence Rgnl Airport (59 mi away); average wind 7 mph; clear or few clouds in 56% of daytime hours, mostly cloudy or overcast in 32%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F3 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph19 of 30
- Hot dayshigh 90°F or more2 of 30
- Muggy daysdaily mean dew point 65°F or more22 of 30
- Wet daysat least 0.01 in of rain or melted snow9 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 7.0 in; a dry September brings about 3.8 in and a wet one about 10.6 in (25th and 75th percentiles). About 4 days bring half an inch or more, and about 2 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202018: average high 89°F
- Coolest September1994: average high 81°F
- Wettest September1999: 19.8 in
- Driest September2012: 0.4 in
- Highest reading97°F (September 12, 2002)
- Lowest reading44°F (September 7, 2003)
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 | 87°F | 83°F | 76°F |
| Normal low | 70°F | 65°F | 54°F |
| Wet days | 11 | 9 | 7 |
| Comfortable days | 0 | 3 | – |
| Daylight | 13.4 h | 12.4 h | 11.3 h |
Highs change by -4°F from August and -7°F into October.
Nearby alternatives in September
- Warmer: Columbia, SC125 mi · high 89°F · 8 wet days
How Myrtle Beach ranks in September
- Normal high167th warmest of 378 cities; 3rd of 5 in South Carolina
- Wet days225th driest of 378
- Comfortable days244th most of 342
What to pack for Myrtle Beach in September
- A rain jacket or umbrella – rain on about 9 days
- A swimsuit – about 19 beach days
Heating and cooling
September has 4 heating degree days and 274 cooling degree days (base 65°F), 6% of the year's total heating and cooling demand.
Questions
How hot is Myrtle Beach in September?
The normal high is 83°F and the normal low is 65°F. From 1991 to 2020 the hottest September reading was 97°F (most recently on September 12, 2002).
Does it rain a lot in Myrtle Beach in September?
About 9 days in September have at least 0.01 in of precipitation, and the normal total is 7.1 in. The wettest September in 1991-2020 was in 1999 (19.8 in); the driest was in 2012 (0.4 in).
Where the numbers come from
- Temperature and frost dates: Myrtle Beach (USC00386153), 5.8 mi NE of the city center, 39 ft . NOAA normals and daily records, 1991-2020.
- Rain: Brookgreen Gardens (USC00381093), 17 mi SW of the city center, 20 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Florence Rgnl Airport (USW00013744), 59 mi NW of the city center, 146 ft (121 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Grand Strand Airport (747915-93718), 13 mi NE of the city center, 29 ft . Hourly observations, 1991-2020.
- Not available for this location: snowfall and snow depth (no station close enough or similar enough in elevation).