Harrisburg weather in September: Harrisburg, Pennsylvania: normal highs, lows, rain and records for September
Harrisburg in September has a normal high of 79°F and a normal low of 58°F, a daily mean of 69°F, falling from 83°F on the 1st to 73°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 4.12 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 15°C, 105 mm of precipitation in September.
- NOAA stationHarrisburg Capitol Cy Airport
- Station IDUSW00014751
- Location40.22°N 76.85°W
- Elevation340 ft (104 m)
- From the center4 miles
- Population50,649
- Jan 40° 25°
- Feb 43° 26°
- Mar 53° 34°
- Apr 65° 43°
- May 75° 53°
- Jun 83° 63°
- Jul 88° 67°
- Aug 85° 66°
- Sep 79° 58°
- Oct 67° 47°
- Nov 55° 37°
- Dec 44° 30°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Harrisburg in September?
The normal high is 79°F and the normal low 58°F, for a daily mean of 68.5°F. September is 6.9°F cooler than August and 11.8°F warmer than October. September is the 4th warmest month of the year in Harrisburg and the 2nd 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 2.2°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 66°F and 71°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 34%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 83°F | 63°F | 32% | 18% |
| September 8 | 81°F | 61°F | 32% | 17% |
| September 15 | 79°F | 59°F | 32% | 17% |
| September 22 | 76°F | 56°F | 33% | 18% |
| September 30 | 73°F | 53°F | 34% | 19% |
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 | 63°F | 32% | 18% | 13 h 10 min |
| September 2 | 83°F | 63°F | 32% | 18% | 13 h |
| September 3 | 83°F | 62°F | 32% | 18% | 13 h |
| September 4 | 82°F | 62°F | 32% | 18% | 13 h |
| September 5 | 82°F | 62°F | 32% | 17% | 13 h |
| September 6 | 82°F | 62°F | 32% | 17% | 12 h 50 min |
| September 7 | 82°F | 61°F | 32% | 17% | 12 h 50 min |
| September 8 | 81°F | 61°F | 32% | 17% | 12 h 50 min |
| September 9 | 81°F | 61°F | 32% | 17% | 12 h 50 min |
| September 10 | 81°F | 60°F | 32% | 17% | 12 h 40 min |
| September 11 | 80°F | 60°F | 32% | 17% | 12 h 40 min |
| September 12 | 80°F | 60°F | 32% | 17% | 12 h 40 min |
| September 13 | 80°F | 60°F | 32% | 17% | 12 h 40 min |
| September 14 | 79°F | 59°F | 32% | 17% | 12 h 30 min |
| September 15 | 79°F | 59°F | 32% | 17% | 12 h 30 min |
| September 16 | 79°F | 59°F | 32% | 17% | 12 h 30 min |
| September 17 | 78°F | 58°F | 32% | 17% | 12 h 30 min |
| September 18 | 78°F | 58°F | 32% | 17% | 12 h 20 min |
| September 19 | 78°F | 57°F | 32% | 17% | 12 h 20 min |
| September 20 | 77°F | 57°F | 33% | 17% | 12 h 20 min |
| September 21 | 77°F | 57°F | 33% | 18% | 12 h 20 min |
| September 22 | 76°F | 56°F | 33% | 18% | 12 h 10 min |
| September 23 | 76°F | 56°F | 33% | 18% | 12 h 10 min |
| September 24 | 76°F | 56°F | 34% | 18% | 12 h 10 min |
| September 25 | 75°F | 55°F | 34% | 18% | 12 h 10 min |
| September 26 | 75°F | 55°F | 34% | 18% | 12 h |
| September 27 | 74°F | 54°F | 34% | 19% | 12 h |
| September 28 | 74°F | 54°F | 34% | 19% | 12 h |
| September 29 | 74°F | 54°F | 34% | 19% | 11 h 50 min |
| September 30 | 73°F | 53°F | 34% | 19% | 11 h 50 min |
- Normal high
- 79°FSeptember average
- Normal low
- 58°FSeptember average
- Precipitation
- 4.12 inmonth total
- Days with precipitation
- 100.01 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
- 26
- Days at 80°F or more
- 12
- Sunshine
- 74%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014751; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Harrisburg in September?
On a given September day the chance of 0.01 inch or more is 32% on average, highest around September 30 (34%). In all, 4.12 in falls on 10 days of a normal September, 1 of them with an inch or more.
In a normal September in Harrisburg, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014751.
What are the records for September in Harrisburg?
The warmest September temperature on this station's record (since 1939) is 102°F, on September 3, 1953; the coldest is 30°F, on September 24, 1963. The wettest September brought 14.97 in (1975).
The September mean against the 1991-2020 normal of 68.5°F: 2021 69.7°F (+1.2), 2022 68.5°F (at normal), 2023 71.4°F (+2.9), 2024 68.8°F (+0.3), 2026 69.0°F (+0.5). 4 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 69.7°F | +1.2°F | 9.11 in |
| 2022 | 68.5°F | at normal | 3.56 in |
| 2023 | 71.4°F | +2.9°F | 4.18 in |
| 2024 | 68.8°F | +0.3°F | 1.83 in |
| 2026 | 69.0°F | +0.5°F | 4.95 in |
Source: records: ACIS, station USW00014751; recent months: ACIS, station USW00014751. Records and recent months use complete months only.
How does September in Harrisburg 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; Harrisburg's is 79°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Harrisburg in August85°F by day, 66°F at night
- Harrisburg in October67°F by day, 47°F at night
- Harrisburg 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