Raleigh, NC weather in September
September in Raleigh: warm and often humid, with some rain. Highs 82°F, lows 63°F, rain on about 7 days.
- Normal high
- 82°F
- Normal low
- 63°F
- Wet days
- 7
- 5.7 in total
- Muggy days
- 13
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 86°F | 78°F |
| Normal low | 67°F | 58°F |
| Chance of a wet day | 25% | 22% |
| Sunrise / sunset | 6:46 am / 7:42 pm | 7:08 am / 7:00 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 am64°Fdew point 62°F
- 9 am72°Fdew point 63°F
- Noon78°Fdew point 62°F
- 3 pm80°Fdew point 62°F
- 6 pm76°Fdew point 63°F
- 9 pm69°Fdew point 63°F
NOAA hourly normals (local standard time) from Raleigh Durham Intl Airport (12 mi away); average wind 6 mph; clear or few clouds in 47% of daytime hours, mostly cloudy or overcast in 38%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F6 of 30
- Hot dayshigh 90°F or more4 of 30
- Muggy daysdaily mean dew point 65°F or more13 of 30
- Wet daysat least 0.01 in of rain or melted snow7 of 30
- Notable rainat least 0.10 in6 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 5.7 in; a dry September brings about 2.5 in and a wet one about 7.5 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, 1991-20202010: average high 89°F
- Coolest September1999: average high 77°F
- Wettest September1999: 20.8 in
- Driest September1991: 0.9 in
- Highest reading97°F (September 1, 2016)
- Lowest reading45°F (September 30, 2006)
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 | 89°F | 82°F | 73°F |
| Normal low | 69°F | 63°F | 51°F |
| Wet days | 8 | 7 | 6 |
| Comfortable days | 1 | 6 | 17 |
| Daylight | 13.5 h | 12.4 h | 11.3 h |
Highs change by -7°F from August and -9°F into October.
Nearby alternatives in September
- Warmer: Columbia, SC183 mi · high 89°F · 8 wet days
- Cooler: Fayetteville, WV208 mi · high 76°F · 9 wet days
How Raleigh ranks in September
- Normal high177th warmest of 378 cities; 7th of 10 in North Carolina
- Wet days173rd driest of 378
- Comfortable days192nd most of 342
Heating and cooling
September has 12 heating degree days and 242 cooling degree days (base 65°F), 5% of the year's total heating and cooling demand.
Questions
How hot is Raleigh in September?
The normal high is 82°F and the normal low is 63°F. From 1991 to 2020 the hottest September reading was 97°F (most recently on September 1, 2016).
Does it rain a lot in Raleigh in September?
About 7 days in September have at least 0.01 in of precipitation, and the normal total is 5.7 in. The wettest September in 1991-2020 was in 1999 (20.8 in); the driest was in 1991 (1.0 in).
Is September a good time to visit Raleigh?
September ranks 6th of 12 months on our comfort score for Raleigh (55 out of 100). It has about 6 comfortable days and about 4 days at 90°F or hotter. The best month is April.
Where the numbers come from
- Temperature, rain and frost dates: Raleigh State Univ (USC00317079), 3.6 mi WNW of the city center, 400 ft (85 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Snowfall, snow depth and humidity and wind by hour: Raleigh Durham Intl Airport (USW00013722), 12 mi NW of the city center, 416 ft (101 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Cloud cover: Pope AFB (USW00013714), 46 mi SSW of the city center, 218 ft (97 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Raleigh-Durham International Airport (723060-13722), 12 mi NW of the city center, 395 ft (80 ft higher than the city). Hourly observations, 1991-2020.