Wilmington weather in September: Wilmington, North Carolina: normal highs, lows, rain and records for September
Wilmington in September has a normal high of 84°F and a normal low of 67°F, a daily mean of 75°F, falling from 87°F on the 1st to 81°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 8.69 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 29°C and low of 19°C, 221 mm of precipitation in September.
- NOAA stationWilmington Int'l Airport
- Station IDUSW00013748
- Location34.27°N 77.90°W
- Elevation33 ft (10 m)
- From the center4 miles
- Population125,284
- Jan 57° 36°
- Feb 60° 38°
- Mar 67° 44°
- Apr 75° 53°
- May 81° 61°
- Jun 87° 69°
- Jul 90° 73°
- Aug 88° 72°
- Sep 84° 67°
- Oct 76° 56°
- Nov 67° 45°
- Dec 60° 39°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Wilmington in September?
The normal high is 84°F and the normal low 67°F, for a daily mean of 75.3°F. September is 4.7°F cooler than August and 9.4°F warmer than October. September is the 4th warmest month of the year in Wilmington and the wettest. Across the month the normal high falls 6°F, from 87°F on September 1 to 81°F on September 30. From one year to the next September's mean temperature typically moves about 1.9°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 73°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 39%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 87°F | 70°F | 39% | 26% |
| September 8 | 86°F | 69°F | 37% | 25% |
| September 15 | 84°F | 67°F | 36% | 23% |
| September 22 | 83°F | 65°F | 34% | 23% |
| September 30 | 81°F | 62°F | 32% | 21% |
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 | 87°F | 70°F | 39% | 26% | 13 h |
| September 2 | 87°F | 70°F | 39% | 26% | 12 h 50 min |
| September 3 | 86°F | 70°F | 38% | 26% | 12 h 50 min |
| September 4 | 86°F | 70°F | 38% | 25% | 12 h 50 min |
| September 5 | 86°F | 69°F | 38% | 25% | 12 h 50 min |
| September 6 | 86°F | 69°F | 38% | 25% | 12 h 50 min |
| September 7 | 86°F | 69°F | 37% | 25% | 12 h 40 min |
| September 8 | 86°F | 69°F | 37% | 25% | 12 h 40 min |
| September 9 | 85°F | 69°F | 37% | 24% | 12 h 40 min |
| September 10 | 85°F | 68°F | 37% | 24% | 12 h 40 min |
| September 11 | 85°F | 68°F | 36% | 24% | 12 h 30 min |
| September 12 | 85°F | 68°F | 36% | 24% | 12 h 30 min |
| September 13 | 85°F | 68°F | 36% | 24% | 12 h 30 min |
| September 14 | 84°F | 67°F | 36% | 24% | 12 h 30 min |
| September 15 | 84°F | 67°F | 36% | 23% | 12 h 30 min |
| September 16 | 84°F | 67°F | 35% | 23% | 12 h 20 min |
| September 17 | 84°F | 67°F | 35% | 23% | 12 h 20 min |
| September 18 | 84°F | 66°F | 35% | 23% | 12 h 20 min |
| September 19 | 83°F | 66°F | 35% | 23% | 12 h 20 min |
| September 20 | 83°F | 66°F | 35% | 23% | 12 h 20 min |
| September 21 | 83°F | 65°F | 35% | 23% | 12 h 10 min |
| September 22 | 83°F | 65°F | 34% | 23% | 12 h 10 min |
| September 23 | 82°F | 65°F | 34% | 22% | 12 h 10 min |
| September 24 | 82°F | 64°F | 34% | 22% | 12 h 10 min |
| September 25 | 82°F | 64°F | 34% | 22% | 12 h 10 min |
| September 26 | 82°F | 64°F | 33% | 22% | 12 h |
| September 27 | 81°F | 63°F | 33% | 22% | 12 h |
| September 28 | 81°F | 63°F | 33% | 22% | 12 h |
| September 29 | 81°F | 63°F | 32% | 21% | 12 h |
| September 30 | 81°F | 62°F | 32% | 21% | 11 h 50 min |
- Normal high
- 84°FSeptember average
- Normal low
- 67°FSeptember average
- Precipitation
- 8.69 inmonth total
- Days with precipitation
- 110.01 inch or more
- Days at 90°F or more
- 4
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 24
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013748; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Wilmington in September?
On a given September day the chance of 0.01 inch or more is 35% on average, highest around September 1 (39%). In all, 8.69 in falls on 11 days of a normal September, 3 of them with an inch or more.
In a normal September in Wilmington, 4 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013748.
What are the records for September in Wilmington?
The warmest September temperature on Wilmington's official record (since 1874) is 100°F, on September 4, 1925; the coldest is 42°F, on September 25, 1887. The wettest September brought 24.13 in (2018).
The September mean against the 1991-2020 normal of 75.3°F: 2021 75.9°F (+0.6), 2022 76.3°F (+1.0), 2023 75.2°F (−0.1), 2024 75.7°F (+0.4), 2025 73.6°F (−1.7), 2026 76.8°F (+1.5). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 75.9°F | +0.6°F | 10.77 in |
| 2022 | 76.3°F | +1.0°F | 5.15 in |
| 2023 | 75.2°F | −0.1°F | 3.21 in |
| 2024 | 75.7°F | +0.4°F | 8.53 in |
| 2025 | 73.6°F | −1.7°F | 4.81 in |
| 2026 | 76.8°F | +1.5°F | 4.43 in |
Source: records: ACIS, NWS threaded record ILMthr; recent months: ACIS, station USW00013748. Records and recent months use complete months only.
How does September in Wilmington compare across North Carolina?
Across the 131 places PlainClimate covers in North Carolina, September normal highs run from 63°F in Beech Mountain to 87°F in Southport; Wilmington's is 84°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Wilmington in August88°F by day, 72°F at night
- Wilmington in October76°F by day, 56°F at night
- Wilmington through the yearEvery month, frost dates, records and recent years
- North Carolina in SeptemberThe statewide normal and the warmest and coolest places
- Southport: North Carolina's warmest Septembernormal high 87°F