Pottstown weather in September: Pottstown, Pennsylvania: normal highs, lows, rain and records for September
Pottstown in September has a normal high of 75°F and a normal low of 55°F, a daily mean of 65°F, falling from 79°F on the 1st to 69°F by the 30th. Measurable precipitation falls on 12 days in a normal September, 4.83 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 13°C, 123 mm of precipitation in September.
- NOAA stationPottstown Limerick Airport
- Station IDUSW00054782
- Location40.24°N 75.56°W
- Elevation291 ft (89 m)
- From the center5 miles
- Population23,553
- Jan 37° 22°
- Feb 40° 23°
- Mar 49° 30°
- Apr 61° 40°
- May 71° 50°
- Jun 79° 59°
- Jul 84° 64°
- Aug 82° 62°
- Sep 75° 55°
- Oct 63° 43°
- Nov 52° 34°
- Dec 42° 27°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Pottstown in September?
The normal high is 75°F and the normal low 55°F, for a daily mean of 64.7°F. September is 7.2°F cooler than August and 11.4°F warmer than October. September is the 4th warmest month of the year in Pottstown and the wettest. Across the month the normal high falls 10°F, from 79°F on September 1 to 69°F on September 30. From one year to the next September's mean temperature typically moves about 2.2°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 63°F and 67°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 41%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 79°F | 59°F | 38% | 21% |
| September 8 | 77°F | 57°F | 38% | 20% |
| September 15 | 75°F | 55°F | 39% | 20% |
| September 22 | 72°F | 53°F | 41% | 21% |
| September 30 | 69°F | 50°F | 41% | 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 | 79°F | 59°F | 38% | 21% | 13 h 10 min |
| September 2 | 79°F | 59°F | 38% | 21% | 13 h |
| September 3 | 79°F | 59°F | 38% | 20% | 13 h |
| September 4 | 78°F | 59°F | 38% | 20% | 13 h |
| September 5 | 78°F | 58°F | 38% | 20% | 13 h |
| September 6 | 78°F | 58°F | 38% | 20% | 12 h 50 min |
| September 7 | 78°F | 58°F | 38% | 20% | 12 h 50 min |
| September 8 | 77°F | 57°F | 38% | 20% | 12 h 50 min |
| September 9 | 77°F | 57°F | 39% | 20% | 12 h 50 min |
| September 10 | 77°F | 57°F | 39% | 20% | 12 h 40 min |
| September 11 | 76°F | 57°F | 39% | 20% | 12 h 40 min |
| September 12 | 76°F | 56°F | 39% | 20% | 12 h 40 min |
| September 13 | 76°F | 56°F | 39% | 20% | 12 h 40 min |
| September 14 | 75°F | 56°F | 39% | 20% | 12 h 30 min |
| September 15 | 75°F | 55°F | 39% | 20% | 12 h 30 min |
| September 16 | 75°F | 55°F | 39% | 20% | 12 h 30 min |
| September 17 | 74°F | 55°F | 40% | 20% | 12 h 30 min |
| September 18 | 74°F | 54°F | 40% | 20% | 12 h 20 min |
| September 19 | 74°F | 54°F | 40% | 20% | 12 h 20 min |
| September 20 | 73°F | 53°F | 40% | 20% | 12 h 20 min |
| September 21 | 73°F | 53°F | 40% | 20% | 12 h 20 min |
| September 22 | 72°F | 53°F | 41% | 21% | 12 h 10 min |
| September 23 | 72°F | 52°F | 41% | 21% | 12 h 10 min |
| September 24 | 72°F | 52°F | 41% | 21% | 12 h 10 min |
| September 25 | 71°F | 52°F | 41% | 21% | 12 h 10 min |
| September 26 | 71°F | 51°F | 41% | 21% | 12 h |
| September 27 | 70°F | 51°F | 41% | 21% | 12 h |
| September 28 | 70°F | 50°F | 41% | 21% | 12 h |
| September 29 | 70°F | 50°F | 41% | 21% | 11 h 50 min |
| September 30 | 69°F | 50°F | 41% | 21% | 11 h 50 min |
- Normal high
- 75°FSeptember average
- Normal low
- 55°FSeptember average
- Precipitation
- 4.83 inmonth total
- Days with precipitation
- 120.01 inch or more
- Days at 90°F or more
- 1
- 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
- 11
- Sunshine
- 75%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00054782; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Pottstown in September?
On a given September day the chance of 0.01 inch or more is 40% on average, highest around September 27 (41%). In all, 4.83 in falls on 12 days of a normal September, 1 of them with an inch or more.
In a normal September in Pottstown, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00054782.
What are the records for September in Pottstown?
The warmest September temperature on this station's record (since 1999) is 98°F, on September 1, 2010; the coldest is 34°F, on September 21, 2020. The wettest September brought 11.35 in (2011).
The September mean against the 1991-2020 normal of 64.7°F: 2021 65.2°F (+0.5), 2022 64.9°F (+0.2), 2023 65.5°F (+0.8), 2024 66.9°F (+2.2), 2026 68.0°F (+3.3). 5 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 65.2°F | +0.5°F | 7.87 in |
| 2022 | 64.9°F | +0.2°F | 3.74 in |
| 2023 | 65.5°F | +0.8°F | 5.20 in |
| 2024 | 66.9°F | +2.2°F | 0.95 in |
| 2026 | 68.0°F | +3.3°F | 1.20 in |
Source: records: ACIS, station USW00054782; recent months: ACIS, station USW00054782. Records and recent months use complete months only.
How does September in Pottstown 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; Pottstown's is 75°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Pottstown in August82°F by day, 62°F at night
- Pottstown in October63°F by day, 43°F at night
- Pottstown 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