Myrtle Beach weather in September: Myrtle Beach, South Carolina: normal highs, lows, rain and records for September
Myrtle Beach in September has a normal high of 83°F and a normal low of 68°F, a daily mean of 76°F, falling from 86°F on the 1st to 80°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 6.65 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 28°C and low of 20°C, 169 mm of precipitation in September.
- NOAA stationNorth Myrtle Beach
- Station IDUSW00093718
- Location33.81°N 78.72°W
- Elevation32 ft (10 m)
- From the center12 miles
- Population40,535
- Jan 56° 37°
- Feb 58° 40°
- Mar 65° 45°
- Apr 72° 53°
- May 79° 62°
- Jun 85° 70°
- Jul 88° 74°
- Aug 87° 73°
- Sep 83° 68°
- Oct 76° 56°
- Nov 66° 46°
- Dec 59° 40°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Myrtle Beach in September?
The normal high is 83°F and the normal low 68°F, for a daily mean of 75.5°F. September is 4.0°F cooler than August and 9.5°F warmer than October. September is the 4th warmest month of the year in Myrtle Beach and the wettest. Across the month the normal high falls 6°F, from 86°F on September 1 to 80°F on September 30. From one year to the next September's mean temperature typically moves about 1.8°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 74°F and 77°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 38%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 86°F | 71°F | 38% | 24% |
| September 8 | 85°F | 70°F | 37% | 22% |
| September 15 | 84°F | 68°F | 36% | 21% |
| September 22 | 82°F | 66°F | 34% | 19% |
| September 30 | 80°F | 63°F | 32% | 18% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 86°F | 71°F | 38% | 24% | 12 h 50 min |
| September 2 | 85°F | 71°F | 38% | 24% | 12 h 50 min |
| September 3 | 85°F | 71°F | 38% | 23% | 12 h 50 min |
| September 4 | 85°F | 71°F | 38% | 23% | 12 h 50 min |
| September 5 | 85°F | 70°F | 38% | 23% | 12 h 50 min |
| September 6 | 85°F | 70°F | 38% | 23% | 12 h 40 min |
| September 7 | 85°F | 70°F | 37% | 23% | 12 h 40 min |
| September 8 | 85°F | 70°F | 37% | 22% | 12 h 40 min |
| September 9 | 85°F | 70°F | 37% | 22% | 12 h 40 min |
| September 10 | 84°F | 69°F | 37% | 22% | 12 h 40 min |
| September 11 | 84°F | 69°F | 36% | 22% | 12 h 30 min |
| September 12 | 84°F | 69°F | 36% | 21% | 12 h 30 min |
| September 13 | 84°F | 69°F | 36% | 21% | 12 h 30 min |
| September 14 | 84°F | 68°F | 36% | 21% | 12 h 30 min |
| September 15 | 84°F | 68°F | 36% | 21% | 12 h 30 min |
| September 16 | 83°F | 68°F | 35% | 21% | 12 h 20 min |
| September 17 | 83°F | 68°F | 35% | 20% | 12 h 20 min |
| September 18 | 83°F | 67°F | 35% | 20% | 12 h 20 min |
| September 19 | 83°F | 67°F | 35% | 20% | 12 h 20 min |
| September 20 | 83°F | 67°F | 35% | 20% | 12 h 20 min |
| September 21 | 82°F | 66°F | 34% | 20% | 12 h 10 min |
| September 22 | 82°F | 66°F | 34% | 19% | 12 h 10 min |
| September 23 | 82°F | 66°F | 34% | 19% | 12 h 10 min |
| September 24 | 82°F | 65°F | 34% | 19% | 12 h 10 min |
| September 25 | 81°F | 65°F | 34% | 19% | 12 h 10 min |
| September 26 | 81°F | 65°F | 34% | 19% | 12 h |
| September 27 | 81°F | 64°F | 33% | 19% | 12 h |
| September 28 | 81°F | 64°F | 33% | 18% | 12 h |
| September 29 | 80°F | 64°F | 33% | 18% | 12 h |
| September 30 | 80°F | 63°F | 32% | 18% | 11 h 50 min |
- Normal high
- 83°FSeptember average
- Normal low
- 68°FSeptember average
- Precipitation
- 6.65 inmonth total
- Days with precipitation
- 110.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 12 h 50 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 25
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00093718; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Myrtle Beach in September?
On a given September day the chance of 0.01 inch or more is 35% on average, highest around September 1 (38%). In all, 6.65 in falls on 11 days of a normal September, 2 of them with an inch or more.
In a normal September in Myrtle Beach, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093718.
What are the records for September in Myrtle Beach?
The warmest September temperature on Myrtle Beach's official record (since 1931) is 99°F, on September 4, 1944; the coldest is 45°F, on September 30, 1967. The wettest September brought 23.16 in (1999).
The September mean against the 1991-2020 normal of 75.5°F: 2021 75.1°F (−0.4), 2022 74.6°F (−0.9), 2023 73.8°F (−1.7), 2024 75.5°F (at normal), 2025 73.7°F (−1.8), 2026 76.3°F (+0.8). 1 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 75.1°F | −0.4°F | 2.46 in |
| 2022 | 74.6°F | −0.9°F | 5.95 in |
| 2023 | 73.8°F | −1.7°F | 3.55 in |
| 2024 | 75.5°F | at normal | 4.51 in |
| 2025 | 73.7°F | −1.8°F | 1.35 in |
| 2026 | 76.3°F | +0.8°F | 2.51 in |
Source: records: ACIS, NWS threaded record CREthr; recent months: ACIS, station USW00093718. Records and recent months use complete months only.
How does September in Myrtle Beach compare across South Carolina?
Across the 73 places PlainClimate covers in South Carolina, September normal highs run from 71°F in Caesars Head to 87°F in Barnwell; Myrtle Beach's is 83°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Myrtle Beach in August87°F by day, 73°F at night
- Myrtle Beach in October76°F by day, 56°F at night
- Myrtle Beach through the yearEvery month, frost dates, records and recent years
- South Carolina in SeptemberThe statewide normal and the warmest and coolest places
- Barnwell: South Carolina's warmest Septembernormal high 87°F