Lafayette weather in September: Lafayette, Louisiana: normal highs, lows, rain and records for September
Lafayette in September has a normal high of 89°F and a normal low of 70°F, a daily mean of 80°F, falling from 91°F on the 1st to 86°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 5.02 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 32°C and low of 21°C, 128 mm of precipitation in September.
- NOAA stationLafayette Regional Airport
- Station IDUSW00013976
- Location30.20°N 91.99°W
- Elevation38 ft (12 m)
- Population122,280
- Jan 62° 44°
- Feb 66° 47°
- Mar 73° 53°
- Apr 79° 59°
- May 86° 67°
- Jun 90° 73°
- Jul 92° 75°
- Aug 92° 75°
- Sep 89° 70°
- Oct 81° 60°
- Nov 72° 50°
- Dec 64° 45°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Lafayette in September?
The normal high is 89°F and the normal low 70°F, for a daily mean of 79.7°F. September is 3.8°F cooler than August and 9.0°F warmer than October. September is the 4th warmest month of the year in Lafayette and the 6th wettest. Across the month the normal high falls 5°F, from 91°F on September 1 to 86°F on September 30. From one year to the next September's mean temperature typically moves about 1.9°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 78°F and 82°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 | 91°F | 74°F | 37% | 26% |
| September 8 | 90°F | 72°F | 35% | 23% |
| September 15 | 89°F | 71°F | 32% | 21% |
| September 22 | 88°F | 69°F | 30% | 19% |
| September 30 | 86°F | 66°F | 27% | 17% |
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 | 91°F | 74°F | 37% | 26% | 12 h 50 min |
| September 2 | 91°F | 73°F | 37% | 25% | 12 h 50 min |
| September 3 | 91°F | 73°F | 37% | 25% | 12 h 40 min |
| September 4 | 91°F | 73°F | 36% | 25% | 12 h 40 min |
| September 5 | 91°F | 73°F | 36% | 24% | 12 h 40 min |
| September 6 | 91°F | 73°F | 35% | 24% | 12 h 40 min |
| September 7 | 91°F | 73°F | 35% | 24% | 12 h 40 min |
| September 8 | 90°F | 72°F | 35% | 23% | 12 h 40 min |
| September 9 | 90°F | 72°F | 34% | 23% | 12 h 30 min |
| September 10 | 90°F | 72°F | 34% | 23% | 12 h 30 min |
| September 11 | 90°F | 72°F | 34% | 22% | 12 h 30 min |
| September 12 | 90°F | 72°F | 33% | 22% | 12 h 30 min |
| September 13 | 90°F | 71°F | 33% | 22% | 12 h 30 min |
| September 14 | 89°F | 71°F | 32% | 21% | 12 h 30 min |
| September 15 | 89°F | 71°F | 32% | 21% | 12 h 20 min |
| September 16 | 89°F | 71°F | 32% | 21% | 12 h 20 min |
| September 17 | 89°F | 70°F | 31% | 20% | 12 h 20 min |
| September 18 | 89°F | 70°F | 31% | 20% | 12 h 20 min |
| September 19 | 89°F | 70°F | 31% | 20% | 12 h 20 min |
| September 20 | 88°F | 70°F | 30% | 20% | 12 h 10 min |
| September 21 | 88°F | 69°F | 30% | 19% | 12 h 10 min |
| September 22 | 88°F | 69°F | 30% | 19% | 12 h 10 min |
| September 23 | 88°F | 69°F | 29% | 19% | 12 h 10 min |
| September 24 | 88°F | 68°F | 29% | 18% | 12 h 10 min |
| September 25 | 87°F | 68°F | 28% | 18% | 12 h 10 min |
| September 26 | 87°F | 68°F | 28% | 18% | 12 h |
| September 27 | 87°F | 67°F | 27% | 17% | 12 h |
| September 28 | 87°F | 67°F | 27% | 17% | 12 h |
| September 29 | 86°F | 67°F | 27% | 17% | 12 h |
| September 30 | 86°F | 66°F | 27% | 17% | 12 h |
- Normal high
- 89°FSeptember average
- Normal low
- 70°FSeptember average
- Precipitation
- 5.02 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 16
- Daylight
- 12 h 50 min to 12 hSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 28
- Sunshine
- 82%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013976; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Lafayette in September?
On a given September day the chance of 0.01 inch or more is 32% on average, highest around September 1 (37%). In all, 5.02 in falls on 9 days of a normal September, 2 of them with an inch or more.
In a normal September in Lafayette, 16 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013976.
How humid and windy is Lafayette in September?
At 3 p.m. the normal temperature is 84°F with 52% relative humidity and a dew point of 64°F; at 6 a.m. it is 67°F with 91% humidity. The wind averages 6.0 mph, most often from the northeast in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 67°F | 64°F | 91% | 4.4 mph | 77% |
| 9 a.m. | 76°F | 66°F | 73% | 7.6 mph | 72% |
| noon | 82°F | 65°F | 55% | 8.7 mph | 66% |
| 3 p.m. | 84°F | 64°F | 52% | 8.5 mph | 71% |
| 6 p.m. | 78°F | 66°F | 67% | 5.8 mph | 79% |
| 9 p.m. | 72°F | 66°F | 82% | 4.5 mph | 84% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013976. 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 Lafayette?
The warmest September temperature on this station's record (since 1893) is 103°F, on September 3, 2000; the coldest is 41°F, on September 28, 1896. The wettest September brought 16.15 in (1973).
The September mean against the 1991-2020 normal of 79.7°F: 2021 78.5°F (−1.2), 2022 79.1°F (−0.6), 2023 83.4°F (+3.7), 2024 80.7°F (+1.0), 2025 79.9°F (+0.2), 2026 82.5°F (+2.8). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 78.5°F | −1.2°F | 11.04 in |
| 2022 | 79.1°F | −0.6°F | 1.26 in |
| 2023 | 83.4°F | +3.7°F | 3.46 in |
| 2024 | 80.7°F | +1.0°F | 5.59 in |
| 2025 | 79.9°F | +0.2°F | 3.45 in |
| 2026 | 82.5°F | +2.8°F | 2.37 in |
Source: records: ACIS, station USW00013976; recent months: ACIS, station USW00013976. Records and recent months use complete months only.
How does September in Lafayette compare across Louisiana?
Across the 65 places PlainClimate covers in Louisiana, September normal highs run from 85°F in Boyce to 90°F in Natchitoches; Lafayette's is 89°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Lafayette in August92°F by day, 75°F at night
- Lafayette in October81°F by day, 60°F at night
- Lafayette through the yearEvery month, frost dates, records and recent years
- Louisiana in SeptemberThe statewide normal and the warmest and coolest places
- Natchitoches: Louisiana's warmest Septembernormal high 90°F