Prairieville weather in September

In September, Prairieville sees average daytime highs of 87°F and overnight lows near 70°F, with 4.2 in of rain across 11.9 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 89°F in the first days to 85°F by the end. The sky is clear or mostly clear about 41% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 36 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Prairieville's 4th-clearest and 9th-windiest month. For the whole year in context, see Prairieville's year-round climate.

Daytime high
87°
4th warmest
Overnight low
70°
9th coldest
Rainfall
4.2 in
11.9 wet days
Daylight
12 h 12 min
5:53 AM – 6:04 PM
Cloud cover
51%
4th clearest
Wind
5 mph
9th windiest
Solar energy
4.9 kWh/m²
Travel score
4.6
out of 10

Prairieville is unincorporated suburban community and census-designated place in Ascension Parish, Louisiana, United States.

Density
470/km²
people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 89°F in the first days to 85°F by the end.

A typical September day in Prairieville reaches about 87°F in the afternoon and slips back to 70°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 81°F and 92°F. Set against its neighbours, September runs about 3°F cooler than August and about 7°F warmer than October.

50°60°70°80°90°151015202530
Avg high (°F)Avg low (°F)
18973
28973
38973
48973
58973
68972
78872
88872
98872
108872
118872
128871
138871
148771
158771
168771
178770
188770
198770
208670
218669
228669
238669
248568
258568
268567
278567
288567
298467
308466

How September really feels in Prairieville

Once humidity and wind are folded in, September averages 21 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
21
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Prairieville weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan62° / 44°4.79.310.35.4
Feb66° / 47°4.48.810.96.1
Mar72° / 53°4.49.711.86.8
Apr78° / 59°4.48.712.77.0
May85° / 67°4.29.713.55.5
Jun89° / 73°4.914.613.93.8
Jul90° / 75°5.617.713.83.2
Aug90° / 74°5.517.213.13.2
Sep87° / 70°4.211.912.24.6
Oct80° / 60°3.6811.37.1
Nov71° / 51°3.57.610.57.1
Dec64° / 46°4.18.910.15.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 42%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14852
24951
35050
45149
55248
65347
75446
85545
95644
105644
115743
125842
135842
145842
155941
165941
175941
185941
196040
206139
216139
226238
236337
246337
256535
266535
276535
286634
296634
306634

Chance of precipitation in September

Any precipitation

Prairieville gets around 4.2 in of rain over 11.9 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 40% and peaks near 49% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
149
249
348
447
547
646
745
844
943
1042
1142
1241
1341
1440
1540
1640
1739
1839
1938
2038
2137
2236
2335
2434
2533
2633
2732
2831
2930
3030

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the oppressive band about 48% of days. Sticky, muggy-or-worse air turns up on roughly 81% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1016125823
2026125822
3027135721
4127135720
5127135819
6127145818
7128145817
8138155716
9138165715
10238175515
11238185514
12238185613
13248195413
14248205412
15348215212
16348225112
17358234911
18458244811
19558254610
20569264510
2166926439
2277927419
23881027408
24981027388
251091127367
261191227356
2712101226346
2813101326326
2914111326315
3015111425305

Wind in September

Winds average 5 mph in September.

Across September, daily wind ranges from about 5 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 36 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 54 minutes over September. Sunrise moves from 5:44 AM to 6:01 AM, and sunset from 6:23 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:446:23
212.65:456:22
312.65:456:20
412.65:466:19
512.55:476:18
612.55:476:17
712.55:486:15
812.45:486:14
912.45:496:13
1012.45:496:11
1112.35:506:10
1212.35:516:09
1312.35:516:08
1412.25:526:06
1512.25:526:05
1612.25:536:04
1712.15:536:02
1812.15:546:01
1912.15:556:00
2012.15:555:58
2112.05:565:57
2212.05:565:56
2312.05:575:54
2411.95:575:53
2511.95:585:52
2611.95:595:51
2711.85:595:49
2811.86:005:48
2911.86:005:47
3011.76:015:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.9 kWh/m².

For context, solar energy here swings from a low near 2.67 kWh/m² to a high of 6.18 kWh/m² in May across the year — September's 4.9 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.1Bright
55.1Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
184.8Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.7Bright
274.7Bright
284.7Bright
294.7Bright
304.7Bright
Planning a trip in September

Hazard calendar for Prairieville

In seasonPeak

In September, Prairieville sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

Prairieville sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Prairieville?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.6
Sightseeing
9th-best month of the year
6.5
Beach & pool
4th-best month of the year

September is a reasonable time to visit Prairieville for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Prairieville in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Prairieville sees daytime highs around 87°F and nights near 70°F. Pack light clothes. Worth having: rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

Sea temperature near Prairieville in September

The nearest coast averages about 83°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 38 mi away) is warmest in August at about 86°F and coldest in January near 58°F.

It's comfortable for a long swim from Apr 5 to Nov 14 — about 7.4 months when the water holds above 68°F.

60°70°80°90°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan58Bracing
Feb58Bracing
Mar64Cool
Apr71Refreshing
May78Warm
Jun84Tropical
Jul86Tropical
Aug86Tropical
Sep83Tropical
Oct76Warm
Nov67Cool
Dec61Cool

UV index in Prairieville in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Prairieville peaks around July 10 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 4 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJul 10UV 10Dec 20UV 4
UV index (midday)Level
Jan4Moderate
Feb6High
Mar6High
Apr10Very high
May10Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov5Moderate
Dec4Moderate

Air quality in Prairieville in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Prairieville is worst in July — around 23 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (January, 9 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1623 µg/m³Jan 199 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb10Good
Mar11Good
Apr11Good
May15Moderate
Jun20Moderate
Jul23Moderate
Aug19Moderate
Sep14Moderate
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Prairieville?

Prairieville sits at 30.3°N, 91.0°W, 23 ft above sea level, in United States. The nearest listed city is Shenandoah, 6.8 mi away.

Topography around Prairieville

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Prairieville.

Within 2 miles, the terrain around Prairieville has only modest variations in elevation — a maximum elevation change of 89 ft around an average of 30 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 180 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 433 ft.

The land around Prairieville is covered by trees (52%) and grassland (31%) within 2 miles, trees (60%) and grassland (23%) within 10 miles, and trees (67%) within 50 miles.

2 miles
89 ft
10 miles
180 ft
50 miles
433 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Shenandoah 6.8 mi · Baton Rouge 16 mi · Central 18 mi · Zachary 26 mi · Hammond 34 mi · Laplace 34 mi · Kenner 48 mi · Bayou Cane 48 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Prairieville (30.303°, -90.972°, elevation 23 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).