Altoona weather in September: Altoona, Pennsylvania: normal highs, lows, rain and records for September
Altoona in September has a normal high of 74°F and a normal low of 53°F, a daily mean of 64°F, falling from 79°F on the 1st to 69°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 3.96 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 12°C, 101 mm of precipitation in September.
- NOAA stationAltoona Blair County Airport
- Station IDUSW00014736
- Location40.30°N 78.32°W
- Elevation1,480 ft (451 m)
- From the center15 miles
- Population42,719
- Jan 36° 21°
- Feb 39° 23°
- Mar 48° 30°
- Apr 61° 40°
- May 71° 50°
- Jun 79° 58°
- Jul 83° 62°
- Aug 81° 60°
- Sep 74° 53°
- Oct 63° 43°
- Nov 51° 34°
- Dec 40° 26°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Altoona in September?
The normal high is 74°F and the normal low 53°F, for a daily mean of 63.7°F. September is 6.9°F cooler than August and 10.7°F warmer than October. September is the 4th warmest month of the year in Altoona 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 62°F and 66°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 35%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 79°F | 58°F | 33% | 19% |
| September 8 | 77°F | 56°F | 33% | 19% |
| September 15 | 75°F | 54°F | 33% | 19% |
| September 22 | 72°F | 51°F | 34% | 19% |
| September 30 | 69°F | 48°F | 35% | 20% |
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 | 58°F | 33% | 19% | 13 h 10 min |
| September 2 | 79°F | 57°F | 33% | 19% | 13 h 10 min |
| September 3 | 78°F | 57°F | 33% | 19% | 13 h |
| September 4 | 78°F | 57°F | 33% | 19% | 13 h |
| September 5 | 78°F | 57°F | 33% | 19% | 13 h |
| September 6 | 78°F | 56°F | 33% | 19% | 12 h 50 min |
| September 7 | 77°F | 56°F | 33% | 18% | 12 h 50 min |
| September 8 | 77°F | 56°F | 33% | 19% | 12 h 50 min |
| September 9 | 77°F | 55°F | 33% | 19% | 12 h 50 min |
| September 10 | 76°F | 55°F | 33% | 18% | 12 h 40 min |
| September 11 | 76°F | 55°F | 33% | 18% | 12 h 40 min |
| September 12 | 76°F | 55°F | 33% | 18% | 12 h 40 min |
| September 13 | 75°F | 54°F | 33% | 18% | 12 h 40 min |
| September 14 | 75°F | 54°F | 33% | 19% | 12 h 30 min |
| September 15 | 75°F | 54°F | 33% | 19% | 12 h 30 min |
| September 16 | 74°F | 53°F | 33% | 19% | 12 h 30 min |
| September 17 | 74°F | 53°F | 33% | 19% | 12 h 30 min |
| September 18 | 74°F | 53°F | 33% | 19% | 12 h 20 min |
| September 19 | 73°F | 52°F | 34% | 19% | 12 h 20 min |
| September 20 | 73°F | 52°F | 34% | 19% | 12 h 20 min |
| September 21 | 72°F | 52°F | 34% | 19% | 12 h 20 min |
| September 22 | 72°F | 51°F | 34% | 19% | 12 h 10 min |
| September 23 | 72°F | 51°F | 34% | 19% | 12 h 10 min |
| September 24 | 71°F | 50°F | 34% | 19% | 12 h 10 min |
| September 25 | 71°F | 50°F | 34% | 19% | 12 h 10 min |
| September 26 | 70°F | 50°F | 34% | 20% | 12 h |
| September 27 | 70°F | 49°F | 34% | 20% | 12 h |
| September 28 | 70°F | 49°F | 35% | 20% | 12 h |
| September 29 | 69°F | 49°F | 34% | 20% | 11 h 50 min |
| September 30 | 69°F | 48°F | 35% | 20% | 11 h 50 min |
- Normal high
- 74°FSeptember average
- Normal low
- 53°FSeptember average
- Precipitation
- 3.96 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
- 73%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014736; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Altoona in September?
On a given September day the chance of 0.01 inch or more is 34% on average, highest around September 28 (35%). In all, 3.96 in falls on 10 days of a normal September, 1 of them with an inch or more.
In a normal September in Altoona, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014736.
How humid and windy is Altoona in September?
At 3 p.m. the normal temperature is 67°F with 55% relative humidity and a dew point of 50°F; at 6 a.m. it is 51°F with 89% humidity. The wind averages 5.8 mph, most often from the west in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 51°F | 48°F | 89% | 4.1 mph | – |
| 9 a.m. | 58°F | 51°F | 77% | 6.2 mph | 49% |
| noon | 64°F | 51°F | 61% | 8.5 mph | 45% |
| 3 p.m. | 67°F | 50°F | 55% | 8.8 mph | 47% |
| 6 p.m. | 61°F | 50°F | 68% | 6.0 mph | 57% |
| 9 p.m. | 57°F | 50°F | 79% | 4.8 mph | 64% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014736. 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 Altoona?
The warmest September temperature on this station's record (since 1948) is 97°F, on September 3, 1953; the coldest is 29°F, on September 27, 1957. The wettest September brought 14.20 in (2004).
The September mean against the 1991-2020 normal of 63.7°F: 2021 65.3°F (+1.6), 2022 64.0°F (+0.3), 2023 63.6°F (−0.1), 2024 63.9°F (+0.2), 2025 63.9°F (+0.2), 2026 65.5°F (+1.8). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 65.3°F | +1.6°F | 8.31 in |
| 2022 | 64.0°F | +0.3°F | 2.58 in |
| 2023 | 63.6°F | −0.1°F | 2.04 in |
| 2024 | 63.9°F | +0.2°F | 1.88 in |
| 2025 | 63.9°F | +0.2°F | 1.33 in |
| 2026 | 65.5°F | +1.8°F | 5.61 in |
Source: records: ACIS, station USW00014736; recent months: ACIS, station USW00014736. Records and recent months use complete months only.
How does September in Altoona 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; Altoona's is 74°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Altoona in August81°F by day, 60°F at night
- Altoona in October63°F by day, 43°F at night
- Altoona 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