West Lafayette weather in September: West Lafayette, Indiana: normal highs, lows, rain and records for September
West Lafayette in September has a normal high of 77°F and a normal low of 52°F, a daily mean of 65°F, falling from 81°F on the 1st to 72°F by the 30th. Measurable precipitation falls on 8 days in a normal September, 3.12 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 25°C and low of 11°C, 79 mm of precipitation in September.
- NOAA stationWest Lafayette (6 mi NW)
- Station IDUSC00129430
- Location40.48°N 86.99°W
- Elevation708 ft (216 m)
- From the center4 miles
- Population46,338
- Jan 32° 16°
- Feb 37° 20°
- Mar 48° 29°
- Apr 61° 39°
- May 72° 51°
- Jun 81° 60°
- Jul 83° 63°
- Aug 82° 60°
- Sep 77° 52°
- Oct 65° 41°
- Nov 50° 32°
- Dec 37° 22°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is West Lafayette in September?
The normal high is 77°F and the normal low 52°F, for a daily mean of 64.6°F. September is 6.3°F cooler than August and 11.6°F warmer than October. September is the 4th warmest month of the year in West Lafayette and the 6th wettest. Across the month the normal high falls 9°F, from 81°F on September 1 to 72°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 62°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 29%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 81°F | 57°F | 27% | 17% |
| September 8 | 79°F | 55°F | 27% | 17% |
| September 15 | 78°F | 53°F | 27% | 17% |
| September 22 | 75°F | 50°F | 28% | 18% |
| September 30 | 72°F | 47°F | 29% | 18% |
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 | 57°F | 27% | 17% | 13 h 10 min |
| September 2 | 81°F | 57°F | 27% | 17% | 13 h 10 min |
| September 3 | 80°F | 57°F | 27% | 17% | 13 h |
| September 4 | 80°F | 57°F | 27% | 17% | 13 h |
| September 5 | 80°F | 56°F | 27% | 17% | 13 h |
| September 6 | 80°F | 56°F | 27% | 17% | 13 h |
| September 7 | 80°F | 56°F | 27% | 17% | 12 h 50 min |
| September 8 | 79°F | 55°F | 27% | 17% | 12 h 50 min |
| September 9 | 79°F | 55°F | 27% | 17% | 12 h 50 min |
| September 10 | 79°F | 54°F | 27% | 17% | 12 h 40 min |
| September 11 | 79°F | 54°F | 27% | 17% | 12 h 40 min |
| September 12 | 78°F | 54°F | 27% | 17% | 12 h 40 min |
| September 13 | 78°F | 53°F | 27% | 17% | 12 h 40 min |
| September 14 | 78°F | 53°F | 27% | 17% | 12 h 30 min |
| September 15 | 78°F | 53°F | 27% | 17% | 12 h 30 min |
| September 16 | 77°F | 52°F | 27% | 17% | 12 h 30 min |
| September 17 | 77°F | 52°F | 27% | 17% | 12 h 30 min |
| September 18 | 77°F | 51°F | 27% | 17% | 12 h 20 min |
| September 19 | 76°F | 51°F | 27% | 17% | 12 h 20 min |
| September 20 | 76°F | 51°F | 27% | 17% | 12 h 20 min |
| September 21 | 76°F | 50°F | 27% | 18% | 12 h 20 min |
| September 22 | 75°F | 50°F | 28% | 18% | 12 h 10 min |
| September 23 | 75°F | 49°F | 28% | 18% | 12 h 10 min |
| September 24 | 74°F | 49°F | 28% | 18% | 12 h 10 min |
| September 25 | 74°F | 49°F | 28% | 18% | 12 h 10 min |
| September 26 | 74°F | 48°F | 28% | 18% | 12 h |
| September 27 | 73°F | 48°F | 28% | 18% | 12 h |
| September 28 | 73°F | 47°F | 28% | 18% | 12 h |
| September 29 | 72°F | 47°F | 28% | 18% | 11 h 50 min |
| September 30 | 72°F | 47°F | 29% | 18% | 11 h 50 min |
- Normal high
- 77°FSeptember average
- Normal low
- 52°FSeptember average
- Precipitation
- 3.12 inmonth total
- Days with precipitation
- 80.01 inch or more
- Days at 90°F or more
- 3
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 25
- Days at 80°F or more
- 14
- Sunshine
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00129430; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in West Lafayette in September?
On a given September day the chance of 0.01 inch or more is 27% on average, highest around September 30 (29%). In all, 3.12 in falls on 8 days of a normal September, 1 of them with an inch or more.
In a normal September in West Lafayette, 3 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00129430.
What are the records for September in West Lafayette?
The warmest September temperature on this station's record (since 1901) is 100°F, on September 9, 1933; the coldest is 25°F, on September 23, 1995. The wettest September brought 11.79 in (1926).
The September mean against the 1991-2020 normal of 64.6°F: 2021 68.8°F (+4.2), 2022 64.8°F (+0.2), 2023 68.5°F (+3.9), 2025 68.6°F (+4.0), 2026 72.7°F (+8.1). 5 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 68.8°F | +4.2°F | 2.13 in |
| 2022 | 64.8°F | +0.2°F | 1.95 in |
| 2023 | 68.5°F | +3.9°F | 0.47 in |
| 2025 | 68.6°F | +4.0°F | 2.15 in |
| 2026 | 72.7°F | +8.1°F | 4.58 in |
Source: records: ACIS, station USC00129430; recent months: ACIS, station USC00129430. Records and recent months use complete months only.
How does September in West Lafayette compare across Indiana?
Across the 99 places PlainClimate covers in Indiana, September normal highs run from 74°F in Angola to 82°F in English; West Lafayette's is 77°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- West Lafayette in August82°F by day, 60°F at night
- West Lafayette in October65°F by day, 41°F at night
- West Lafayette through the yearEvery month, frost dates, records and recent years
- Indiana in SeptemberThe statewide normal and the warmest and coolest places
- English: Indiana's warmest Septembernormal high 82°F