Baton Rouge weather in September: Baton Rouge, Louisiana: normal highs, lows, rain and records for September
Baton Rouge in September has a normal high of 89°F and a normal low of 69°F, a daily mean of 79°F, falling from 91°F on the 1st to 86°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 4.42 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 32°C and low of 21°C, 112 mm of precipitation in September.
- NOAA stationBaton Rouge Metro Airport
- Station IDUSW00013970
- Location30.54°N 91.15°W
- Elevation64 ft (20 m)
- From the center7 miles
- Population220,907
- Jan 62° 42°
- Feb 67° 45°
- Mar 73° 51°
- Apr 79° 57°
- May 86° 65°
- Jun 91° 72°
- Jul 92° 74°
- Aug 92° 73°
- Sep 89° 69°
- Oct 81° 58°
- Nov 71° 48°
- Dec 64° 43°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Baton Rouge in September?
The normal high is 89°F and the normal low 69°F, for a daily mean of 78.8°F. September is 4.0°F cooler than August and 9.3°F warmer than October. September is the 4th warmest month of the year in Baton Rouge and the 10th 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 77°F and 81°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 | 91°F | 72°F | 35% | 24% |
| September 8 | 90°F | 71°F | 32% | 22% |
| September 15 | 89°F | 69°F | 29% | 19% |
| September 22 | 88°F | 67°F | 27% | 17% |
| September 30 | 86°F | 65°F | 25% | 16% |
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 | 72°F | 35% | 24% | 12 h 50 min |
| September 2 | 91°F | 72°F | 35% | 24% | 12 h 50 min |
| September 3 | 91°F | 72°F | 34% | 23% | 12 h 50 min |
| September 4 | 91°F | 72°F | 34% | 23% | 12 h 40 min |
| September 5 | 91°F | 71°F | 33% | 23% | 12 h 40 min |
| September 6 | 90°F | 71°F | 33% | 22% | 12 h 40 min |
| September 7 | 90°F | 71°F | 33% | 22% | 12 h 40 min |
| September 8 | 90°F | 71°F | 32% | 22% | 12 h 40 min |
| September 9 | 90°F | 71°F | 32% | 21% | 12 h 30 min |
| September 10 | 90°F | 71°F | 31% | 21% | 12 h 30 min |
| September 11 | 90°F | 70°F | 31% | 21% | 12 h 30 min |
| September 12 | 90°F | 70°F | 30% | 20% | 12 h 30 min |
| September 13 | 89°F | 70°F | 30% | 20% | 12 h 30 min |
| September 14 | 89°F | 70°F | 30% | 20% | 12 h 30 min |
| September 15 | 89°F | 69°F | 29% | 19% | 12 h 20 min |
| September 16 | 89°F | 69°F | 29% | 19% | 12 h 20 min |
| September 17 | 89°F | 69°F | 29% | 19% | 12 h 20 min |
| September 18 | 88°F | 69°F | 28% | 18% | 12 h 20 min |
| September 19 | 88°F | 68°F | 28% | 18% | 12 h 20 min |
| September 20 | 88°F | 68°F | 28% | 18% | 12 h 10 min |
| September 21 | 88°F | 68°F | 27% | 18% | 12 h 10 min |
| September 22 | 88°F | 67°F | 27% | 17% | 12 h 10 min |
| September 23 | 87°F | 67°F | 27% | 17% | 12 h 10 min |
| September 24 | 87°F | 67°F | 26% | 17% | 12 h 10 min |
| September 25 | 87°F | 66°F | 26% | 17% | 12 h 10 min |
| September 26 | 87°F | 66°F | 26% | 16% | 12 h |
| September 27 | 87°F | 66°F | 25% | 16% | 12 h |
| September 28 | 86°F | 65°F | 25% | 16% | 12 h |
| September 29 | 86°F | 65°F | 25% | 16% | 12 h |
| September 30 | 86°F | 65°F | 25% | 16% | 12 h |
- Normal high
- 89°FSeptember average
- Normal low
- 69°FSeptember average
- Precipitation
- 4.42 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 USW00013970; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Baton Rouge in September?
On a given September day the chance of 0.01 inch or more is 29% on average, highest around September 1 (35%). In all, 4.42 in falls on 9 days of a normal September, 1 of them with an inch or more.
In a normal September in Baton Rouge, 16 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013970.
What are the records for September in Baton Rouge?
The warmest September temperature on Baton Rouge's official record (since 1892) is 104°F, on September 4, 2000; the coldest is 43°F, on September 29, 1908. The wettest September brought 13.95 in (1977).
The September mean against the 1991-2020 normal of 78.8°F: 2021 76.7°F (−2.1), 2022 78.6°F (−0.2), 2023 83.0°F (+4.3), 2024 81.5°F (+2.7), 2025 80.2°F (+1.4), 2026 82.8°F (+4.0). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 76.7°F | −2.1°F | 8.35 in |
| 2022 | 78.6°F | −0.2°F | 0.86 in |
| 2023 | 83.0°F | +4.3°F | 2.98 in |
| 2024 | 81.5°F | +2.7°F | 7.37 in |
| 2025 | 80.2°F | +1.4°F | 3.82 in |
| 2026 | 82.8°F | +4.0°F | 1.91 in |
Source: records: ACIS, NWS threaded record BTRthr; recent months: ACIS, station USW00013970. Records and recent months use complete months only.
How does September in Baton Rouge 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; Baton Rouge's is 89°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Baton Rouge in August92°F by day, 73°F at night
- Baton Rouge in October81°F by day, 58°F at night
- Baton Rouge 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