Lafayette, LA weather in September
In September, Lafayette sees highs around 89°F and lows around 70°F: hot and oppressively humid, with some rain. Rain falls on about 9 days.
- Normal high
- 89°F
- Normal low
- 70°F
- Wet days
- 9
- 5.0 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 | 74°F | 66°F |
| Chance of a wet day | 36% | 28% |
| Sunrise / sunset | 6:45 am / 7:31 pm | 7:01 am / 6:55 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 (2 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 5.0 in; a dry September brings about 3.3 in and a wet one about 6.2 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 2 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202005: average high 93°F
- Coolest September2001: average high 85°F
- Wettest September2008: 10.4 in
- Driest September2017: 0.3 in
- Highest reading103°F (September 3, 2000)
- Lowest reading50°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 | 75°F | 70°F | 60°F |
| Wet days | 12 | 9 | 8 |
| Comfortable days | 0 | 1 | 8 |
| Daylight | 13.2 h | 12.3 h | 11.4 h |
Highs change by -3°F from August and -8°F into October.
How Lafayette ranks in September
- Normal high74th warmest of 378 cities; 3rd of 5 in Louisiana
- Wet days276th driest of 378
- Comfortable days285th most of 342
What to pack for Lafayette 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 0 heating degree days and 441 cooling degree days (base 65°F), 10% of the year's total heating and cooling demand.
Questions
How hot is Lafayette in September?
The normal high is 89°F and the normal low is 70°F. From 1991 to 2020 the hottest September reading was 103°F (September 3, 2000).
Does it rain a lot in Lafayette in September?
About 9 days in September have at least 0.01 in of precipitation, and the normal total is 5.0 in. The wettest September in 1991-2020 was in 2008 (10.4 in); the driest was in 2017 (0.3 in).
Is September a good time to visit Lafayette?
September ranks 10th of 12 months on our comfort score for Lafayette (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, frost dates, humidity and wind by hour and cloud cover: Lafayette Rgnl Airport (USW00013976), 2.3 mi SE of the city center, 38 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Lafayette (USC00165021), 2.7 mi W of the city center, 25 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Lafayette Regional Airport (722405-13976), 2.5 mi SE of the city center, 35 ft . Hourly observations, 1991-2020.