Indiana weather in September: Indiana, Pennsylvania: normal highs, lows, rain and records for September
Indiana in September has a normal high of 75°F and a normal low of 51°F, a daily mean of 63°F, falling from 79°F on the 1st to 70°F by the 30th. Measurable precipitation falls on 12 days in a normal September, 4.18 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 11°C, 106 mm of precipitation in September.
- NOAA stationIndiana (3 mi SE)
- Station IDUSC00364214
- Location40.60°N 79.12°W
- Elevation1,102 ft (336 m)
- From the center3 miles
- Population14,294
- Jan 36° 18°
- Feb 39° 18°
- Mar 49° 25°
- Apr 62° 35°
- May 72° 46°
- Jun 79° 54°
- Jul 83° 59°
- Aug 81° 58°
- Sep 75° 51°
- Oct 63° 40°
- Nov 51° 30°
- Dec 41° 24°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Indiana in September?
The normal high is 75°F and the normal low 51°F, for a daily mean of 63.0°F. September is 6.4°F cooler than August and 11.1°F warmer than October. September is the 4th warmest month of the year in Indiana and the 5th wettest. Across the month the normal high falls 9°F, from 79°F on September 1 to 70°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 61°F and 65°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 | 55°F | 38% | 24% |
| September 8 | 77°F | 54°F | 38% | 25% |
| September 15 | 75°F | 52°F | 39% | 25% |
| September 22 | 73°F | 49°F | 40% | 25% |
| September 30 | 70°F | 47°F | 41% | 26% |
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 | 55°F | 38% | 24% | 13 h 10 min |
| September 2 | 79°F | 55°F | 38% | 24% | 13 h 10 min |
| September 3 | 79°F | 55°F | 38% | 25% | 13 h |
| September 4 | 78°F | 55°F | 38% | 25% | 13 h |
| September 5 | 78°F | 54°F | 38% | 25% | 13 h |
| September 6 | 78°F | 54°F | 38% | 25% | 13 h |
| September 7 | 78°F | 54°F | 38% | 25% | 12 h 50 min |
| September 8 | 77°F | 54°F | 38% | 25% | 12 h 50 min |
| September 9 | 77°F | 53°F | 39% | 25% | 12 h 50 min |
| September 10 | 77°F | 53°F | 39% | 25% | 12 h 40 min |
| September 11 | 77°F | 53°F | 39% | 25% | 12 h 40 min |
| September 12 | 76°F | 52°F | 39% | 25% | 12 h 40 min |
| September 13 | 76°F | 52°F | 39% | 25% | 12 h 40 min |
| September 14 | 76°F | 52°F | 39% | 25% | 12 h 30 min |
| September 15 | 75°F | 52°F | 39% | 25% | 12 h 30 min |
| September 16 | 75°F | 51°F | 39% | 25% | 12 h 30 min |
| September 17 | 75°F | 51°F | 39% | 25% | 12 h 30 min |
| September 18 | 74°F | 51°F | 39% | 25% | 12 h 20 min |
| September 19 | 74°F | 50°F | 39% | 25% | 12 h 20 min |
| September 20 | 74°F | 50°F | 39% | 25% | 12 h 20 min |
| September 21 | 73°F | 50°F | 39% | 25% | 12 h 20 min |
| September 22 | 73°F | 49°F | 40% | 25% | 12 h 10 min |
| September 23 | 72°F | 49°F | 40% | 25% | 12 h 10 min |
| September 24 | 72°F | 49°F | 40% | 26% | 12 h 10 min |
| September 25 | 72°F | 48°F | 40% | 26% | 12 h 10 min |
| September 26 | 71°F | 48°F | 40% | 26% | 12 h |
| September 27 | 71°F | 48°F | 40% | 26% | 12 h |
| September 28 | 70°F | 47°F | 41% | 26% | 12 h |
| September 29 | 70°F | 47°F | 41% | 26% | 11 h 50 min |
| September 30 | 70°F | 47°F | 41% | 26% | 11 h 50 min |
- Normal high
- 75°FSeptember average
- Normal low
- 51°FSeptember average
- Precipitation
- 4.18 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
- 23
- Days at 80°F or more
- 9
- Sunshine
- 75%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00364214; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Indiana in September?
On a given September day the chance of 0.01 inch or more is 39% on average, highest around September 29 (41%). In all, 4.18 in falls on 12 days of a normal September, 1 of them with an inch or more.
In a normal September in Indiana, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00364214.
What are the records for September in Indiana?
The warmest September temperature on this station's record (since 1946) is 97°F, on September 3, 1953; the coldest is 25°F, on September 27, 1957. The wettest September brought 11.75 in (2018).
The September mean against the 1991-2020 normal of 63.0°F: 2021 63.6°F (+0.6), 2022 63.2°F (+0.2), 2023 63.0°F (at normal), 2024 64.5°F (+1.5), 2025 64.2°F (+1.2), 2026 65.3°F (+2.3). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.6°F | +0.6°F | 6.46 in |
| 2022 | 63.2°F | +0.2°F | 5.30 in |
| 2023 | 63.0°F | at normal | 2.45 in |
| 2024 | 64.5°F | +1.5°F | 2.25 in |
| 2025 | 64.2°F | +1.2°F | 2.04 in |
| 2026 | 65.3°F | +2.3°F | 6.90 in |
Source: records: ACIS, station USC00364214; recent months: ACIS, station USC00364214. Records and recent months use complete months only.
How does September in Indiana 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; Indiana's is 75°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Indiana in August81°F by day, 58°F at night
- Indiana in October63°F by day, 40°F at night
- Indiana 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