Johnstown weather in September: Johnstown, Pennsylvania: normal highs, lows, rain and records for September
Johnstown in September has a normal high of 71°F and a normal low of 53°F, a daily mean of 62°F, falling from 75°F on the 1st to 66°F by the 30th. Measurable precipitation falls on 12 days in a normal September, 3.99 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 21°C and low of 12°C, 101 mm of precipitation in September.
- NOAA stationJohnstown Cambria County Airport
- Station IDUSW00004726
- Location40.32°N 78.83°W
- Elevation2,284 ft (696 m)
- From the center5 miles
- Population17,853
- Jan 33° 19°
- Feb 36° 21°
- Mar 45° 28°
- Apr 58° 38°
- May 68° 49°
- Jun 75° 57°
- Jul 79° 61°
- Aug 77° 60°
- Sep 71° 53°
- Oct 59° 43°
- Nov 47° 33°
- Dec 38° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Johnstown in September?
The normal high is 71°F and the normal low 53°F, for a daily mean of 61.6°F. September is 7.0°F cooler than August and 10.5°F warmer than October. September is the 4th warmest month of the year in Johnstown and the 4th wettest. Across the month the normal high falls 9°F, from 75°F on September 1 to 66°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 59°F and 64°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 44%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 75°F | 57°F | 41% | 23% |
| September 8 | 73°F | 55°F | 40% | 22% |
| September 15 | 71°F | 53°F | 41% | 22% |
| September 22 | 69°F | 51°F | 42% | 22% |
| September 30 | 66°F | 48°F | 44% | 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 | 75°F | 57°F | 41% | 23% | 13 h 10 min |
| September 2 | 75°F | 57°F | 41% | 23% | 13 h 10 min |
| September 3 | 74°F | 57°F | 40% | 22% | 13 h |
| September 4 | 74°F | 56°F | 40% | 22% | 13 h |
| September 5 | 74°F | 56°F | 40% | 22% | 13 h |
| September 6 | 74°F | 56°F | 40% | 22% | 12 h 50 min |
| September 7 | 73°F | 56°F | 40% | 22% | 12 h 50 min |
| September 8 | 73°F | 55°F | 40% | 22% | 12 h 50 min |
| September 9 | 73°F | 55°F | 40% | 22% | 12 h 50 min |
| September 10 | 72°F | 55°F | 40% | 22% | 12 h 40 min |
| September 11 | 72°F | 54°F | 40% | 22% | 12 h 40 min |
| September 12 | 72°F | 54°F | 41% | 22% | 12 h 40 min |
| September 13 | 72°F | 54°F | 41% | 22% | 12 h 40 min |
| September 14 | 71°F | 53°F | 41% | 22% | 12 h 30 min |
| September 15 | 71°F | 53°F | 41% | 22% | 12 h 30 min |
| September 16 | 71°F | 53°F | 41% | 22% | 12 h 30 min |
| September 17 | 70°F | 52°F | 41% | 22% | 12 h 30 min |
| September 18 | 70°F | 52°F | 41% | 22% | 12 h 20 min |
| September 19 | 70°F | 52°F | 41% | 22% | 12 h 20 min |
| September 20 | 69°F | 51°F | 41% | 22% | 12 h 20 min |
| September 21 | 69°F | 51°F | 41% | 22% | 12 h 20 min |
| September 22 | 69°F | 51°F | 42% | 22% | 12 h 10 min |
| September 23 | 68°F | 50°F | 42% | 22% | 12 h 10 min |
| September 24 | 68°F | 50°F | 42% | 23% | 12 h 10 min |
| September 25 | 67°F | 50°F | 42% | 23% | 12 h 10 min |
| September 26 | 67°F | 49°F | 43% | 23% | 12 h |
| September 27 | 67°F | 49°F | 43% | 23% | 12 h |
| September 28 | 66°F | 49°F | 43% | 23% | 12 h |
| September 29 | 66°F | 48°F | 43% | 23% | 11 h 50 min |
| September 30 | 66°F | 48°F | 44% | 23% | 11 h 50 min |
- Normal high
- 71°FSeptember average
- Normal low
- 53°FSeptember average
- Precipitation
- 3.99 inmonth total
- Days with precipitation
- 120.01 inch or more
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 16
- Days at 80°F or more
- 4
- Sunshine
- 73%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00004726; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Johnstown in September?
On a given September day the chance of 0.01 inch or more is 41% on average, highest around September 30 (44%). In all, 3.99 in falls on 12 days of a normal September, 1 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00004726.
How humid and windy is Johnstown in September?
At 3 p.m. the normal temperature is 63°F with 60% relative humidity and a dew point of 48°F; at 6 a.m. it is 51°F with 87% humidity. The wind averages 7.9 mph, most often from the west in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 51°F | 47°F | 87% | 6.8 mph | – |
| 9 a.m. | 55°F | 49°F | 79% | 8.1 mph | – |
| noon | 61°F | 49°F | 64% | 9.5 mph | – |
| 3 p.m. | 63°F | 48°F | 60% | 9.7 mph | – |
| 6 p.m. | 59°F | 49°F | 70% | 7.5 mph | – |
| 9 p.m. | 55°F | 48°F | 77% | 7.1 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00004726. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Johnstown?
The warmest September temperature on this station's record (since 2000) is 88°F, on September 9, 2002; the coldest is 32°F, on September 29, 2000. The wettest September brought 11.25 in (2011).
The September mean against the 1991-2020 normal of 61.6°F: 2021 63.2°F (+1.6), 2022 61.6°F (at normal), 2023 62.5°F (+0.9), 2024 63.1°F (+1.5), 2025 64.0°F (+2.4), 2026 63.7°F (+2.1). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.2°F | +1.6°F | 7.97 in |
| 2022 | 61.6°F | at normal | 3.96 in |
| 2023 | 62.5°F | +0.9°F | 2.92 in |
| 2024 | 63.1°F | +1.5°F | 3.16 in |
| 2025 | 64.0°F | +2.4°F | 2.68 in |
| 2026 | 63.7°F | +2.1°F | 7.36 in |
Source: records: ACIS, station USW00004726; recent months: ACIS, station USW00004726. Records and recent months use complete months only.
How does September in Johnstown 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; Johnstown's is 71°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Johnstown in August77°F by day, 60°F at night
- Johnstown in October59°F by day, 43°F at night
- Johnstown 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