Biloxi weather in September

In September, Biloxi sees average daytime highs of 86°F and overnight lows near 71°F, with 4.8 in of rain across 12.4 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 87°F in the first days to 83°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 Biloxi's 5th-clearest and 9th-windiest month. For the whole year in context, see Biloxi's year-round climate.

Daytime high
86°
4th warmest
Overnight low
71°
9th coldest
Rainfall
4.8 in
12.4 wet days
Daylight
12 h 12 min
5:44 AM – 5:55 PM
Cloud cover
51%
5th clearest
Wind
6 mph
9th windiest
Solar energy
4.91 kWh/m²
Travel score
4.9
out of 10

Biloxi is city in Harrison County, Mississippi, United States.

Density
260/km²
people per km²
Founded
1720

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 87°F in the first days to 83°F by the end.

A typical September day in Biloxi reaches about 86°F in the afternoon and slips back to 71°F overnight — a 15°F spread between the day's warmth and the night's chill. On most days the high lands between 80°F and 91°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)
18873
28873
38773
48773
58773
68773
78773
88772
98772
108772
118772
128772
138671
148671
158671
168671
178671
188670
198570
208570
218569
228569
238569
248468
258468
268468
278467
288367
298367
308366

How September really feels in Biloxi

Once humidity and wind are folded in, September averages 19 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
19
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.

Biloxi weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan60° / 44°4.79.510.35.0
Feb64° / 47°4.78.910.95.8
Mar70° / 53°5.39.311.86.7
Apr76° / 59°4.49.212.77.1
May83° / 67°3.91013.56.1
Jun87° / 73°5.815.913.94.0
Jul89° / 75°6.320.413.83.2
Aug89° / 75°6.319.913.13.3
Sep86° / 71°4.812.412.24.9
Oct78° / 61°3.47.811.37.3
Nov69° / 51°3.87.510.57.0
Dec62° / 46°4.49.110.15.6

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 (%)
15149
25149
35248
45248
55248
65347
75446
85545
95644
105743
115743
125842
135842
145842
155842
165842
175941
185941
195941
206040
216139
226139
236139
246238
256238
266238
276436
286436
296436
306535

Chance of precipitation in September

Any precipitation

Biloxi gets around 4.8 in of rain over 12.4 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 41% and peaks near 53% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
153
253
352
452
551
650
749
848
947
1046
1145
1245
1344
1443
1542
1642
1741
1840
1939
2038
2137
2236
2335
2433
2532
2632
2731
2830
2929
3029

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 47% of days. Sticky, muggy-or-worse air turns up on roughly 83% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1013105333
2013115431
3023125429
4024125428
5024135526
6124145425
7124155424
8125155423
9135165421
10135175420
11136185319
12236195119
13236195218
14237205117
15247214917
16248214816
17348224716
18349224615
19459234515
205510234414
215510234313
226611234212
238611234111
249712234010
251071323399
261171323388
271281423368
281381422357
291491522346
301591522336

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 5:36 AM to 5:53 AM, and sunset from 6:15 PM to 5:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:366:15
212.65:366:13
312.65:376:12
412.65:386:11
512.55:386:10
612.55:396:08
712.55:396:07
812.45:406:06
912.45:406:04
1012.45:416:03
1112.35:426:02
1212.35:426:01
1312.35:435:59
1412.25:435:58
1512.25:445:57
1612.25:445:55
1712.15:455:54
1812.15:465:53
1912.15:465:51
2012.15:475:50
2112.05:475:49
2212.05:485:47
2312.05:485:46
2411.95:495:45
2511.95:505:43
2611.95:505:42
2711.85:515:41
2811.85:515:40
2911.85:525:38
3011.75:535:37

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.91 kWh/m².

For context, solar energy here swings from a low near 2.71 kWh/m² to a high of 6.25 kWh/m² in May across the year — September's 4.91 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.1Bright
55.1Bright
65.1Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.7Bright
264.7Bright
274.7Bright
284.7Bright
294.7Bright
304.7Bright
Planning a trip in September

Hazard calendar for Biloxi

In seasonPeak

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

Biloxi 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 Biloxi?

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

4.9
Sightseeing
9th-best month of the year
6.5
Beach & pool
3rd-best month of the year

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

What to pack for Biloxi in September

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

In September, Biloxi sees daytime highs around 86°F and nights near 71°F. Pack light clothes. Worth having: rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

Sea temperature near Biloxi 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 offshore is warmest in August at about 85°F and coldest in January near 58°F.

It's comfortable for a long swim from Apr 3 to Nov 17 — about 7.5 months when the water holds above 68°F.

60°70°80°90°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan58Bracing
Feb59Cool
Mar64Cool
Apr71Refreshing
May78Warm
Jun83Tropical
Jul85Tropical
Aug85Tropical
Sep83Tropical
Oct76Warm
Nov68Refreshing
Dec62Cool

UV index in Biloxi in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Biloxi peaks around July 13 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 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 13UV 10Dec 19UV 4
UV index (midday)Level
Jan4Moderate
Feb6High
Mar7High
Apr10Very high
May10Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep8Very high
Oct6High
Nov5Moderate
Dec4Moderate

Air quality in Biloxi 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 Biloxi is worst in July — around 22 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (December, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodJul 1621 µg/m³Dec 137 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar13Moderate
Apr11Good
May13Moderate
Jun17Moderate
Jul22Moderate
Aug17Moderate
Sep12Good
Oct8Good
Nov7Good
Dec7Good
Location & terrain

Where is Biloxi?

Biloxi sits at 30.4°N, 88.9°W, 20 ft above sea level, in United States. The nearest listed city is Ocean Springs, 3.7 mi away.

Topography around Biloxi

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

Within 2 miles, the terrain around Biloxi has only modest variations in elevation — a maximum elevation change of 75 ft around an average of 7 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 400 ft.

The land around Biloxi is covered by water (60%) within 2 miles, water (49%) and trees (34%) within 10 miles, and trees (47%) and water (43%) within 50 miles.

2 miles
75 ft
10 miles
180 ft
50 miles
400 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Ocean Springs 3.7 mi · West Gulfport 12 mi · Gulfport 12 mi · Long Beach 16 mi · Gautier 16 mi · Pascagoula 20 mi · Tillmans Corner 45 mi · Prichard 53 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 Biloxi (30.396°, -88.8853°, elevation 20 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).