Sulphur weather in September

In September, Sulphur sees average daytime highs of 87°F and overnight lows near 70°F, with 5.1 in of rain across 11.5 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 2nd-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 42% 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 Sulphur's 3rd-clearest and 10th-windiest month. For the whole year in context, see Sulphur's year-round climate.

Daytime high
87°
4th warmest
Overnight low
70°
9th coldest
Rainfall
5.1 in
11.5 wet days
Daylight
12 h 12 min
6:02 AM – 6:13 PM
Cloud cover
50%
3rd clearest
Wind
6 mph
10th windiest
Solar energy
5.05 kWh/m²
Travel score
4.6
out of 10

Sulphur is suburb city of Lake Charles, located in Calcasieu Parish, Louisiana, United States.

Density
780/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 Sulphur 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 93°F. Set against its neighbours, September runs about 3°F cooler than August and about 8°F warmer than October.

50°60°70°80°90°151015202530
Avg high (°F)Avg low (°F)
18973
28973
38973
48973
58973
68973
78973
88972
98872
108872
118872
128872
138871
148871
158771
168771
178771
188770
198770
208770
218669
228669
238669
248668
258568
268567
278567
288567
298566
308466

How September really feels in Sulphur

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.

Sulphur weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan61° / 44°5.19.910.35.2
Feb65° / 48°3.79.410.95.9
Mar71° / 54°4.110.311.86.6
Apr77° / 60°4.71012.76.9
May84° / 68°4.211.113.55.6
Jun88° / 74°5.515.413.93.8
Jul90° / 75°4.516.213.83.3
Aug91° / 75°4.915.713.13.3
Sep87° / 70°5.111.512.24.6
Oct80° / 61°3.98.211.37.0
Nov70° / 51°4.38.810.56.8
Dec63° / 46°4.99.710.15.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 39%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15149
25248
35347
45347
55446
65545
75644
85644
95743
105743
115842
125941
135941
146040
156040
166040
176139
186139
196238
206238
216436
226535
236634
246733
256733
266832
276931
286931
297030
307030

Chance of precipitation in September

Any precipitation

Sulphur gets around 5.1 in of rain over 11.5 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 39% and peaks near 52% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
152
252
351
450
549
648
747
847
946
1045
1144
1243
1342
1441
1540
1639
1738
1836
1935
2034
2133
2232
2331
2429
2528
2628
2727
2826
2925
3025

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 44% of days. Sticky, muggy-or-worse air turns up on roughly 79% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1027115525
2127115524
3138125323
4138135322
5138135322
6138145321
7148155220
8148165120
9248165119
10249175019
11249174918
12349184918
13349194817
14349204717
15459204616
16459214516
17559224515
18569224314
19669224214
20779234113
218710234012
229810233812
2310810233711
2411910233610
2512101123359
2613101123349
2714111223338
2815111223327
2916111323316
3017121322306

Wind in September

Winds average 6 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
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
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 5:54 AM to 6:11 AM, and sunset from 6:32 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:546:32
212.65:556:31
312.65:556:30
412.65:566:29
512.55:566:27
612.55:576:26
712.55:576:25
812.45:586:24
912.45:586:22
1012.45:596:21
1112.36:006:20
1212.36:006:18
1312.36:016:17
1412.26:016:16
1512.26:026:15
1612.26:026:13
1712.16:036:12
1812.16:046:11
1912.16:046:09
2012.16:056:08
2112.06:056:07
2212.06:066:05
2312.06:066:04
2411.96:076:03
2511.96:086:01
2611.96:086:00
2711.86:095:59
2811.86:095:58
2911.86:105:56
3011.76:115:55

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.05 kWh/m².

For context, solar energy here swings from a low near 2.64 kWh/m² to a high of 6.16 kWh/m² in June across the year — September's 5.05 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.2Bright
45.2Bright
55.2Bright
65.2Bright
75.2Bright
85.2Bright
95.1Bright
105.1Bright
115.1Bright
125.1Bright
135.1Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
205.0Bright
214.9Bright
224.9Bright
234.9Bright
244.9Bright
254.9Bright
264.9Bright
274.9Bright
284.9Bright
294.9Bright
304.8Bright
Planning a trip in September

Hazard calendar for Sulphur

In seasonPeak

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

Sulphur 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 Sulphur?

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
3rd-best month of the year

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

What to pack for Sulphur in September

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

In September, Sulphur 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 Sulphur in September

The nearest coast averages about 84°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 42 mi away) is warmest in August at about 86°F and coldest in January near 59°F.

It's comfortable for a long swim from Apr 1 to Nov 22 — about 7.8 months when the water holds above 68°F.

60°70°80°90°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan59Cool
Feb60Cool
Mar65Cool
Apr71Refreshing
May78Warm
Jun84Tropical
Jul86Tropical
Aug86Tropical
Sep84Tropical
Oct78Warm
Nov69Refreshing
Dec63Cool

UV index in Sulphur in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sulphur peaks around July 12 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 12UV 10Dec 21UV 4
UV index (midday)Level
Jan4Moderate
Feb6High
Mar7High
Apr10Very high
May10Extreme
Jun10Very high
Jul10Extreme
Aug9Very high
Sep8Very high
Oct6High
Nov5Moderate
Dec4Moderate

Air quality in Sulphur 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 Sulphur is worst in July — around 22 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (December, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1522 µg/m³Dec 168 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb11Good
Mar12Good
Apr11Good
May13Moderate
Jun18Moderate
Jul22Moderate
Aug17Moderate
Sep14Moderate
Oct11Good
Nov9Good
Dec8Good
Location & terrain

Where is Sulphur?

Sulphur sits at 30.2°N, 93.4°W, 16 ft above sea level, in United States. The nearest listed city is Lake Charles, 11 mi away.

Topography around Sulphur

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

Within 2 miles, the terrain around Sulphur has only modest variations in elevation — a maximum elevation change of 82 ft around an average of 26 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 144 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 381 ft.

The land around Sulphur is covered by trees (55%) and grassland (25%) within 2 miles, trees (53%) and grassland (28%) within 10 miles, and trees (48%) within 50 miles.

2 miles
82 ft
10 miles
144 ft
50 miles
381 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Lake Charles 11 mi · Orange 24 mi · Groves 38 mi · Nederland 41 mi · Port Arthur 42 mi · Beaumont 45 mi · Opelousas 80 mi · Lafayette 81 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 Sulphur (30.2366°, -93.3774°, elevation 16 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).