Washington weather in September: Washington, Pennsylvania: normal highs, lows, rain and records for September
Washington in September has a normal high of 76°F and a normal low of 54°F, a daily mean of 65°F, falling from 81°F on the 1st to 71°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 3.57 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 12°C, 91 mm of precipitation in September.
- NOAA stationWashington (3 mi NE)
- Station IDUSC00369318
- Location40.18°N 80.19°W
- Elevation1,300 ft (396 m)
- From the center3 miles
- Population13,334
- Jan 37° 20°
- Feb 40° 22°
- Mar 49° 29°
- Apr 63° 40°
- May 72° 49°
- Jun 80° 58°
- Jul 83° 62°
- Aug 83° 60°
- Sep 76° 54°
- Oct 64° 43°
- Nov 52° 33°
- Dec 41° 26°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Washington in September?
The normal high is 76°F and the normal low 54°F, for a daily mean of 64.8°F. September is 6.6°F cooler than August and 11.4°F warmer than October. September is the 4th warmest month of the year in Washington and the 4th wettest. Across the month the normal high falls 10°F, from 81°F on September 1 to 71°F on September 30. From one year to the next September's mean temperature typically moves about 2.3°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 37%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 81°F | 58°F | 31% | 19% |
| September 8 | 79°F | 56°F | 32% | 20% |
| September 15 | 77°F | 54°F | 33% | 20% |
| September 22 | 74°F | 51°F | 35% | 21% |
| September 30 | 71°F | 48°F | 37% | 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 | 81°F | 58°F | 31% | 19% | 13 h 10 min |
| September 2 | 81°F | 58°F | 31% | 19% | 13 h |
| September 3 | 80°F | 58°F | 31% | 19% | 13 h |
| September 4 | 80°F | 58°F | 31% | 19% | 13 h |
| September 5 | 80°F | 57°F | 31% | 19% | 13 h |
| September 6 | 80°F | 57°F | 32% | 20% | 12 h 50 min |
| September 7 | 79°F | 57°F | 32% | 20% | 12 h 50 min |
| September 8 | 79°F | 56°F | 32% | 20% | 12 h 50 min |
| September 9 | 79°F | 56°F | 32% | 20% | 12 h 50 min |
| September 10 | 78°F | 56°F | 32% | 20% | 12 h 40 min |
| September 11 | 78°F | 55°F | 33% | 20% | 12 h 40 min |
| September 12 | 78°F | 55°F | 33% | 20% | 12 h 40 min |
| September 13 | 77°F | 55°F | 33% | 20% | 12 h 40 min |
| September 14 | 77°F | 54°F | 33% | 20% | 12 h 30 min |
| September 15 | 77°F | 54°F | 33% | 20% | 12 h 30 min |
| September 16 | 76°F | 54°F | 34% | 20% | 12 h 30 min |
| September 17 | 76°F | 53°F | 34% | 20% | 12 h 30 min |
| September 18 | 75°F | 53°F | 34% | 21% | 12 h 20 min |
| September 19 | 75°F | 52°F | 34% | 21% | 12 h 20 min |
| September 20 | 75°F | 52°F | 35% | 21% | 12 h 20 min |
| September 21 | 74°F | 52°F | 35% | 21% | 12 h 20 min |
| September 22 | 74°F | 51°F | 35% | 21% | 12 h 10 min |
| September 23 | 73°F | 51°F | 36% | 21% | 12 h 10 min |
| September 24 | 73°F | 50°F | 36% | 21% | 12 h 10 min |
| September 25 | 73°F | 50°F | 36% | 21% | 12 h 10 min |
| September 26 | 72°F | 50°F | 36% | 21% | 12 h |
| September 27 | 72°F | 49°F | 36% | 22% | 12 h |
| September 28 | 71°F | 49°F | 37% | 22% | 12 h |
| September 29 | 71°F | 48°F | 37% | 22% | 11 h 50 min |
| September 30 | 71°F | 48°F | 37% | 21% | 11 h 50 min |
- Normal high
- 76°FSeptember average
- Normal low
- 54°FSeptember average
- Precipitation
- 3.57 inmonth total
- Days with precipitation
- 100.01 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
- 21
- Days at 80°F or more
- 8
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00369318; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Washington in September?
On a given September day the chance of 0.01 inch or more is 34% on average, highest around September 29 (37%). In all, 3.57 in falls on 10 days of a normal September, 1 of them with an inch or more.
In a normal September in Washington, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00369318.
How does September in Washington 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; Washington's is 76°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Washington in August83°F by day, 60°F at night
- Washington in October64°F by day, 43°F at night
- Washington 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