Baton Rouge, LA weather in September
Expect hot, oppressively humid weather with some rain in Baton Rouge in September, with highs near 89°F and lows near 69°F. Rain falls on about 9 days.
- Normal high
- 89°F
- Normal low
- 69°F
- Wet days
- 9
- 4.4 in total
- Muggy days
- 25
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 91°F | 86°F |
| Normal low | 72°F | 65°F |
| Chance of a wet day | 34% | 25% |
| Sunrise / sunset | 6:41 am / 7:27 pm | 6:57 am / 6:51 pm |
| Daylight | 12.8 h | 11.9 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical September day
- 6 am71°Fdew point 69°F
- 9 am80°Fdew point 71°F
- Noon85°Fdew point 69°F
- 3 pm86°Fdew point 68°F
- 6 pm81°Fdew point 70°F
- 9 pm76°Fdew point 70°F
NOAA hourly normals (local standard time) from Lafayette Rgnl Airport (53 mi away); average wind 6 mph; clear or few clouds in 63% of daytime hours, mostly cloudy or overcast in 23%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F1 of 30
- Hot dayshigh 90°F or more16 of 30
- Muggy daysdaily mean dew point 65°F or more25 of 30
- Wet daysat least 0.01 in of rain or melted snow9 of 30
- Notable rainat least 0.10 in6 of 30
- Freezing nightslow 32°F or below0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 4.4 in; a dry September brings about 2.3 in and a wet one about 6.3 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202019: average high 94°F
- Coolest September2001: average high 85°F
- Wettest September2005: 11.7 in
- Driest September2017: 0.08 in
- Highest reading104°F (September 4, 2000)
- Lowest reading47°F (September 28, 1993)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 92°F | 89°F | 81°F |
| Normal low | 73°F | 69°F | 58°F |
| Wet days | 12 | 9 | 7 |
| Comfortable days | 0 | 1 | 9 |
| Daylight | 13.2 h | 12.3 h | 11.4 h |
Highs change by -3°F from August and -8°F into October.
How Baton Rouge ranks in September
- Normal high79th warmest of 378 cities; 4th of 5 in Louisiana
- Wet days220th driest of 378
- Comfortable days292nd most of 342
What to pack for Baton Rouge in September
- Light, breathable clothing – highs near 89°F and about 25 muggy days
- A rain jacket or umbrella – rain on about 9 days
Heating and cooling
September has 1 heating degree days and 415 cooling degree days (base 65°F), 10% of the year's total heating and cooling demand.
Questions
How hot is Baton Rouge in September?
The normal high is 89°F and the normal low is 69°F. From 1991 to 2020 the hottest September reading was 104°F (September 4, 2000).
Does it rain a lot in Baton Rouge in September?
About 9 days in September have at least 0.01 in of precipitation, and the normal total is 4.4 in. The wettest September in 1991-2020 was in 2005 (11.7 in); the driest was in 2017 (0.08 in).
Is September a good time to visit Baton Rouge?
September ranks 9th of 12 months on our comfort score for Baton Rouge (39 out of 100). It has about 1 comfortable day and about 16 days at 90°F or hotter. The best months are March, April and November.
Where the numbers come from
- Temperature, rain and frost dates: Baton Rouge Ryan Airport (USW00013970), 6.0 mi N of the city center, 64 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Baton Rouge Sherwood (USC00160558), 6.4 mi E of the city center, 55 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Lafayette Rgnl Airport (USW00013976), 53 mi WSW of the city center, 38 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Lafayette Regional Airport (722405-13976), 53 mi WSW of the city center, 35 ft . Hourly observations, 1991-2020.