New Castle weather in September: New Castle, Pennsylvania: normal highs, lows, rain and records for September
New Castle in September has a normal high of 79°F and a normal low of 52°F, a daily mean of 65°F, falling from 83°F on the 1st to 73°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 3.86 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 11°C, 98 mm of precipitation in September.
- NOAA stationNew Castle (1 mi N)
- Station IDUSC00366233
- Location41.02°N 80.36°W
- Elevation825 ft (252 m)
- Population21,332
- Jan 37° 19°
- Feb 40° 20°
- Mar 49° 27°
- Apr 63° 36°
- May 73° 47°
- Jun 82° 56°
- Jul 86° 60°
- Aug 85° 59°
- Sep 79° 52°
- Oct 66° 41°
- Nov 53° 32°
- Dec 42° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is New Castle in September?
The normal high is 79°F and the normal low 52°F, for a daily mean of 65.4°F. September is 6.5°F cooler than August and 11.6°F warmer than October. September is the 4th warmest month of the year in New Castle and the 5th wettest. Across the month the normal high falls 10°F, from 83°F on September 1 to 73°F on September 30. From one year to the next September's mean temperature typically moves about 2.6°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 63°F and 68°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 | 83°F | 57°F | 34% | 21% |
| September 8 | 81°F | 55°F | 34% | 21% |
| September 15 | 79°F | 53°F | 34% | 21% |
| September 22 | 76°F | 50°F | 36% | 22% |
| September 30 | 73°F | 47°F | 38% | 23% |
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 | 83°F | 57°F | 34% | 21% | 13 h 10 min |
| September 2 | 83°F | 56°F | 34% | 21% | 13 h 10 min |
| September 3 | 83°F | 56°F | 34% | 21% | 13 h |
| September 4 | 82°F | 56°F | 34% | 21% | 13 h |
| September 5 | 82°F | 56°F | 34% | 21% | 13 h |
| September 6 | 82°F | 55°F | 34% | 21% | 13 h |
| September 7 | 82°F | 55°F | 34% | 21% | 12 h 50 min |
| September 8 | 81°F | 55°F | 34% | 21% | 12 h 50 min |
| September 9 | 81°F | 55°F | 34% | 21% | 12 h 50 min |
| September 10 | 81°F | 54°F | 34% | 21% | 12 h 50 min |
| September 11 | 80°F | 54°F | 34% | 21% | 12 h 40 min |
| September 12 | 80°F | 54°F | 34% | 21% | 12 h 40 min |
| September 13 | 80°F | 53°F | 34% | 21% | 12 h 40 min |
| September 14 | 79°F | 53°F | 34% | 21% | 12 h 30 min |
| September 15 | 79°F | 53°F | 34% | 21% | 12 h 30 min |
| September 16 | 79°F | 52°F | 34% | 21% | 12 h 30 min |
| September 17 | 78°F | 52°F | 35% | 21% | 12 h 30 min |
| September 18 | 78°F | 52°F | 35% | 21% | 12 h 20 min |
| September 19 | 78°F | 51°F | 35% | 21% | 12 h 20 min |
| September 20 | 77°F | 51°F | 35% | 22% | 12 h 20 min |
| September 21 | 77°F | 51°F | 35% | 22% | 12 h 20 min |
| September 22 | 76°F | 50°F | 36% | 22% | 12 h 10 min |
| September 23 | 76°F | 50°F | 36% | 22% | 12 h 10 min |
| September 24 | 76°F | 49°F | 36% | 22% | 12 h 10 min |
| September 25 | 75°F | 49°F | 37% | 22% | 12 h 10 min |
| September 26 | 75°F | 49°F | 37% | 22% | 12 h |
| September 27 | 74°F | 48°F | 37% | 22% | 12 h |
| September 28 | 74°F | 48°F | 37% | 22% | 12 h |
| September 29 | 74°F | 47°F | 38% | 23% | 11 h 50 min |
| September 30 | 73°F | 47°F | 38% | 23% | 11 h 50 min |
- Normal high
- 79°FSeptember average
- Normal low
- 52°FSeptember average
- Precipitation
- 3.86 inmonth total
- Days with precipitation
- 110.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 25
- Days at 80°F or more
- 14
- Sunshine
- 74%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00366233; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in New Castle in September?
On a given September day the chance of 0.01 inch or more is 35% on average, highest around September 30 (38%). In all, 3.86 in falls on 11 days of a normal September, 1 of them with an inch or more.
In a normal September in New Castle, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00366233.
What are the records for September in New Castle?
The warmest September temperature on this station's record (since 1894) is 100°F, on September 2, 1953; the coldest is 26°F, on September 22, 1904. The wettest September brought 10.92 in (2004).
Source: records: ACIS, station USC00366233. Records and recent months use complete months only.
How does September in New Castle compare across Pennsylvania?
Across the 108 places PlainClimate covers in Pennsylvania, September normal highs run from 68°F in Laporte to 80°F in Marcus Hook; New Castle's is 79°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- New Castle in August85°F by day, 59°F at night
- New Castle in October66°F by day, 41°F at night
- New Castle through the yearEvery month, frost dates, records and recent years
- Pennsylvania in SeptemberThe statewide normal and the warmest and coolest places
- Marcus Hook: Pennsylvania's warmest Septembernormal high 80°F