Apex weather in September: Apex, North Carolina: normal highs, lows, rain and records for September
Apex in September has a normal high of 82°F and a normal low of 62°F, a daily mean of 72°F, falling from 85°F on the 1st to 77°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 5.27 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 28°C and low of 17°C, 134 mm of precipitation in September.
- NOAA stationApex
- Station IDUSC00310212
- Location35.74°N 78.84°W
- Elevation450 ft (137 m)
- From the center3 miles
- Population75,977
- Jan 51° 31°
- Feb 54° 33°
- Mar 62° 39°
- Apr 72° 48°
- May 79° 57°
- Jun 86° 65°
- Jul 89° 69°
- Aug 87° 68°
- Sep 82° 62°
- Oct 72° 50°
- Nov 62° 40°
- Dec 54° 34°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Apex in September?
The normal high is 82°F and the normal low 62°F, for a daily mean of 71.6°F. September is 5.9°F cooler than August and 10.9°F warmer than October. September is the 4th warmest month of the year in Apex and the wettest. Across the month the normal high falls 8°F, from 85°F on September 1 to 77°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 69°F and 74°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 30%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 85°F | 66°F | 30% | 20% |
| September 8 | 84°F | 64°F | 29% | 19% |
| September 15 | 82°F | 62°F | 28% | 18% |
| September 22 | 80°F | 60°F | 27% | 18% |
| September 30 | 77°F | 57°F | 27% | 17% |
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 | 85°F | 66°F | 30% | 20% | 13 h |
| September 2 | 85°F | 65°F | 30% | 20% | 13 h |
| September 3 | 85°F | 65°F | 30% | 20% | 12 h 50 min |
| September 4 | 85°F | 65°F | 30% | 20% | 12 h 50 min |
| September 5 | 84°F | 65°F | 29% | 20% | 12 h 50 min |
| September 6 | 84°F | 65°F | 29% | 20% | 12 h 50 min |
| September 7 | 84°F | 64°F | 29% | 19% | 12 h 50 min |
| September 8 | 84°F | 64°F | 29% | 19% | 12 h 40 min |
| September 9 | 84°F | 64°F | 29% | 19% | 12 h 40 min |
| September 10 | 83°F | 64°F | 28% | 19% | 12 h 40 min |
| September 11 | 83°F | 63°F | 28% | 19% | 12 h 40 min |
| September 12 | 83°F | 63°F | 28% | 19% | 12 h 30 min |
| September 13 | 82°F | 63°F | 28% | 19% | 12 h 30 min |
| September 14 | 82°F | 63°F | 28% | 18% | 12 h 30 min |
| September 15 | 82°F | 62°F | 28% | 18% | 12 h 30 min |
| September 16 | 82°F | 62°F | 28% | 18% | 12 h 30 min |
| September 17 | 81°F | 62°F | 28% | 18% | 12 h 20 min |
| September 18 | 81°F | 61°F | 28% | 18% | 12 h 20 min |
| September 19 | 81°F | 61°F | 28% | 18% | 12 h 20 min |
| September 20 | 80°F | 61°F | 27% | 18% | 12 h 20 min |
| September 21 | 80°F | 60°F | 27% | 18% | 12 h 10 min |
| September 22 | 80°F | 60°F | 27% | 18% | 12 h 10 min |
| September 23 | 79°F | 60°F | 27% | 18% | 12 h 10 min |
| September 24 | 79°F | 59°F | 27% | 18% | 12 h 10 min |
| September 25 | 79°F | 59°F | 27% | 18% | 12 h 10 min |
| September 26 | 78°F | 58°F | 27% | 18% | 12 h |
| September 27 | 78°F | 58°F | 27% | 18% | 12 h |
| September 28 | 78°F | 57°F | 27% | 18% | 12 h |
| September 29 | 77°F | 57°F | 27% | 18% | 12 h |
| September 30 | 77°F | 57°F | 27% | 17% | 11 h 50 min |
- Normal high
- 82°FSeptember average
- Normal low
- 62°FSeptember average
- Precipitation
- 5.27 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 3
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 28
- Days at 80°F or more
- 19
- Sunshine
- 78%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00310212; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Apex in September?
On a given September day the chance of 0.01 inch or more is 28% on average, highest around September 1 (30%). In all, 5.27 in falls on 9 days of a normal September, 2 of them with an inch or more.
In a normal September in Apex, 3 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00310212.
What are the records for September in Apex?
The September mean against the 1991-2020 normal of 71.6°F: 2021 72.3°F (+0.7), 2022 72.4°F (+0.8), 2023 72.0°F (+0.4), 2024 72.2°F (+0.6). 4 of 4 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 72.3°F | +0.7°F | 2.70 in |
| 2022 | 72.4°F | +0.8°F | 1.35 in |
| 2023 | 72.0°F | +0.4°F | 5.19 in |
| 2024 | 72.2°F | +0.6°F | 12.41 in |
Source: recent months: ACIS, station USC00310212. Records and recent months use complete months only.
How does September in Apex 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; Apex's is 82°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.