Raleigh weather in September: Raleigh, North Carolina: normal highs, lows, rain and records for September
Raleigh in September has a normal high of 83°F and a normal low of 63°F, a daily mean of 73°F, falling from 86°F on the 1st to 78°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 5.15 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 28°C and low of 17°C, 131 mm of precipitation in September.
- NOAA stationRaleigh-Durham International Airport
- Station IDUSW00013722
- Location35.89°N 78.78°W
- Elevation416 ft (127 m)
- From the center9 miles
- Population499,825
- Jan 52° 32°
- Feb 56° 34°
- Mar 63° 40°
- Apr 73° 49°
- May 80° 58°
- Jun 87° 66°
- Jul 91° 70°
- Aug 89° 69°
- Sep 83° 63°
- Oct 73° 50°
- Nov 63° 40°
- Dec 55° 34°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Raleigh in September?
The normal high is 83°F and the normal low 63°F, for a daily mean of 72.6°F. September is 6.2°F cooler than August and 10.9°F warmer than October. September is the 4th warmest month of the year in Raleigh and the wettest. Across the month the normal high falls 8°F, from 86°F on September 1 to 78°F on September 30. From one year to the next September's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 70°F and 75°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 31%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 86°F | 67°F | 31% | 20% |
| September 8 | 85°F | 65°F | 30% | 19% |
| September 15 | 83°F | 63°F | 29% | 19% |
| September 22 | 81°F | 61°F | 28% | 19% |
| September 30 | 78°F | 57°F | 27% | 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 | 67°F | 31% | 20% | 13 h |
| September 2 | 86°F | 67°F | 31% | 20% | 13 h |
| September 3 | 86°F | 66°F | 31% | 20% | 12 h 50 min |
| September 4 | 86°F | 66°F | 30% | 20% | 12 h 50 min |
| September 5 | 85°F | 66°F | 30% | 20% | 12 h 50 min |
| September 6 | 85°F | 66°F | 30% | 20% | 12 h 50 min |
| September 7 | 85°F | 66°F | 30% | 19% | 12 h 50 min |
| September 8 | 85°F | 65°F | 30% | 19% | 12 h 40 min |
| September 9 | 84°F | 65°F | 29% | 19% | 12 h 40 min |
| September 10 | 84°F | 65°F | 29% | 19% | 12 h 40 min |
| September 11 | 84°F | 64°F | 29% | 19% | 12 h 40 min |
| September 12 | 84°F | 64°F | 29% | 19% | 12 h 30 min |
| September 13 | 83°F | 64°F | 29% | 19% | 12 h 30 min |
| September 14 | 83°F | 64°F | 29% | 19% | 12 h 30 min |
| September 15 | 83°F | 63°F | 29% | 19% | 12 h 30 min |
| September 16 | 83°F | 63°F | 29% | 19% | 12 h 30 min |
| September 17 | 82°F | 63°F | 29% | 19% | 12 h 20 min |
| September 18 | 82°F | 62°F | 28% | 19% | 12 h 20 min |
| September 19 | 82°F | 62°F | 28% | 19% | 12 h 20 min |
| September 20 | 81°F | 62°F | 28% | 19% | 12 h 20 min |
| September 21 | 81°F | 61°F | 28% | 19% | 12 h 10 min |
| September 22 | 81°F | 61°F | 28% | 19% | 12 h 10 min |
| September 23 | 80°F | 60°F | 28% | 19% | 12 h 10 min |
| September 24 | 80°F | 60°F | 28% | 19% | 12 h 10 min |
| September 25 | 80°F | 60°F | 28% | 18% | 12 h 10 min |
| September 26 | 79°F | 59°F | 28% | 18% | 12 h |
| September 27 | 79°F | 59°F | 28% | 18% | 12 h |
| September 28 | 79°F | 58°F | 28% | 18% | 12 h |
| September 29 | 79°F | 58°F | 27% | 18% | 12 h |
| September 30 | 78°F | 57°F | 27% | 18% | 11 h 50 min |
- Normal high
- 83°FSeptember average
- Normal low
- 63°FSeptember average
- Precipitation
- 5.15 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 5
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 29
- Days at 80°F or more
- 20
- Sunshine
- 78%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013722; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Raleigh in September?
On a given September day the chance of 0.01 inch or more is 29% on average, highest around September 1 (31%). In all, 5.15 in falls on 9 days of a normal September, 2 of them with an inch or more.
In a normal September in Raleigh, 5 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013722.
How humid and windy is Raleigh in September?
At 3 p.m. the normal temperature is 76°F with 53% relative humidity and a dew point of 58°F; at 6 a.m. it is 60°F with 91% humidity. The wind averages 5.6 mph, most often from the northeast in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 60°F | 57°F | 91% | 4.1 mph | 46% |
| 9 a.m. | 67°F | 59°F | 76% | 6.9 mph | 41% |
| noon | 74°F | 58°F | 57% | 7.9 mph | 37% |
| 3 p.m. | 76°F | 58°F | 53% | 7.9 mph | 32% |
| 6 p.m. | 71°F | 59°F | 67% | 5.1 mph | 38% |
| 9 p.m. | 65°F | 59°F | 81% | 4.5 mph | 52% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013722. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Raleigh?
The warmest September temperature on Raleigh's official record (since 1887) is 104°F, on September 6, 1954; the coldest is 37°F, on September 26, 1950. The wettest September brought 21.79 in (1999).
The September mean against the 1991-2020 normal of 72.6°F: 2021 73.0°F (+0.4), 2022 73.8°F (+1.2), 2023 73.9°F (+1.3), 2024 74.2°F (+1.6), 2025 72.1°F (−0.5), 2026 76.7°F (+4.1). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 73.0°F | +0.4°F | 2.86 in |
| 2022 | 73.8°F | +1.2°F | 4.70 in |
| 2023 | 73.9°F | +1.3°F | 5.48 in |
| 2024 | 74.2°F | +1.6°F | 13.02 in |
| 2025 | 72.1°F | −0.5°F | 1.92 in |
| 2026 | 76.7°F | +4.1°F | 2.17 in |
Source: records: ACIS, NWS threaded record RDUthr; recent months: ACIS, station USW00013722. Records and recent months use complete months only.
How does September in Raleigh 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; Raleigh's is 83°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Raleigh in August89°F by day, 69°F at night
- Raleigh in October73°F by day, 50°F at night
- Raleigh 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